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* [patch] Add discriminators to DWARF line table
@ 2009-04-21 23:16 Cary Coutant
  2009-04-22  4:19 ` Daniel Jacobowitz
  0 siblings, 1 reply; 15+ messages in thread
From: Cary Coutant @ 2009-04-21 23:16 UTC (permalink / raw)
  To: gcc-patches

[-- Attachment #1: Type: text/plain, Size: 4367 bytes --]

The attached patch lays some groundwork for the addition of
sample-based profiling, as described in the paper, "Feedback-Directed
Optimizations in GCC with Estimated Edge Profiles from Hardware Event
Sampling," by Ramasamy et al., at last year's GCC summit:

  http://gccsummit.org/2008/gcc-2008-proceedings.pdf

One of the challenges listed in that paper was insufficient source
position information due to code from a single source position being
separated into two or more basic blocks. To address this problem,
we've introduced the concept of a "discriminator," which is simply an
extra column in the DWARF line number table that can be used to
distinguish between instructions in multiple basic blocks that share a
common source position. The proposal to extend the DWARF format can be
found on the DWARF wiki:

  http://wiki.dwarfstd.org/index.php?title=Path_Discriminators

This DWARF extension has been approved for the DWARF-4 specification,
and I've submitted a couple of binutils patches to add the necessary
support to gas, readelf, and objdump:

  http://sourceware.org/ml/binutils/2009-04/msg00308.html
  http://sourceware.org/ml/binutils/2009-04/msg00310.html

This patch adds a discriminator field to the basic block structure,
and assigns discriminators during gimplification. Whenever we add an
edge between two basic blocks where the end of the "from" block and
the entry of the "to" block have the same source position, we assign a
new discriminator to the "to" block. This value gets picked up at the
end of the compilation and added to the .loc directive in the assembly
output. I've added a configure check to make sure that discriminator
support is available in the target assembler.

With optimization, it's possible to lose the assigned discriminator
sometimes -- copy propagation can empty a basic block, allowing DCE to
remove it, only to recreate it when coming out of SSA. I have a plan
to remember the discriminator in the PHI nodes, but I talked with
Diego about it and he suggested leaving it as is until we know how
important it is to fix that. Assigning the discriminators later could
have avoided that problem, but the discriminators need to be assigned
early enough that we can know what discriminators were assigned to the
basic blocks when we're reading the sample-based profiling information
and setting the profile counts in those basic blocks. There are also
some cases where control flow is generated later that I don't yet take
care of (like switch statements), but we'll take care of that when
we're ready to use the profiling information in those cases.

A patch (or series of patches) to add sample-based profiling support
is under development, and should be ready well before the end of stage
1.

-cary


	* basic-block.h (struct basic_block_def): Add discriminator field.
	* dbxout.c (dbxout_source_line): Add new parameter.  Change all
	callers.
	* debug.c (do_nothing_debug_hooks): Add additional entry.
	(debug_nothing_int_charstar_int): New function.
	* debug.h (struct gcc_debug_hooks): Add parameter to source_line
	hook.
	(debug_nothing_int_charstar_int): New declaration.
	* dwarf2out.c (dwarf2out_source_line): Add new parameter.  Write
	discriminator value in .loc directive.
	* final.c (last_discriminator): New variable.
	(discriminator): New variable.
	(final_start_function): Initialize above variables, pass current
	discriminator to debug hook.
	(notice_source_line): Check for discriminator change.
	* gimple-pretty-print.c (dump_bb_header): Print discriminator value.
	* sdbout.c (sdbout_source_line): New parameter.
	* tree-cfg.c (struct locus_discrim_map): New structure type.
	(discriminator_per_locus): New hash table.
	(build_gimple_cfg): Allocate and free discriminator hash table.
	(make_edges): Call assign_discriminator.
	(locus_map_hash): New function.
	(locus_map_eq): New function.
	(next_discriminator_for_locus): New function.
	(assign_discriminator): New function.
	(make_cond_expr_edges): Call assign_discriminator.
	(make_gimple_switch_edges): Likewise.
	(first_non_label_stmt): New function.
	* vmsdbgout.c (vmsdbgout_source_line): Add new parameter.  Change
	all callers.
	* xcoffout.c (xcoffout_source_line): Add new parameter.

	* configure.ac (gcc_cv_as_discriminator): New configury check for
	gas support for discriminator.
	* configure: Regenerate.
	* config.in: Regenerate.

[-- Attachment #2: gcc-discrim-patch.txt --]
[-- Type: text/plain, Size: 74175 bytes --]

Index: configure
===================================================================
--- configure	(revision 146448)
+++ configure	(working copy)
@@ -1231,7 +1231,7 @@ esac
     else
       echo "$as_me: WARNING: no configuration information is in $ac_dir" >&2
     fi
-    cd $ac_popdir
+    cd "$ac_popdir"
   done
 fi
 
@@ -2647,8 +2647,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -2706,8 +2705,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -2823,8 +2821,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -2878,8 +2875,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -2924,8 +2920,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -2969,8 +2964,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -3618,8 +3612,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -3789,8 +3782,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -3854,8 +3846,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -4019,8 +4010,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -4330,8 +4320,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -4406,8 +4395,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -4469,8 +4457,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -4510,8 +4497,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -4567,8 +4553,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -4608,8 +4593,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -4673,8 +4657,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -4707,13 +4690,9 @@ See \`config.log' for more details." >&2
 esac
 else
   if test "$cross_compiling" = yes; then
-  { { echo "$as_me:$LINENO: error: in \`$ac_pwd':" >&5
-echo "$as_me: error: in \`$ac_pwd':" >&2;}
-{ { echo "$as_me:$LINENO: error: cannot run test program while cross compiling
-See \`config.log' for more details." >&5
-echo "$as_me: error: cannot run test program while cross compiling
-See \`config.log' for more details." >&2;}
-   { (exit 1); exit 1; }; }; }
+  { { echo "$as_me:$LINENO: error: internal error: not reached in cross-compile" >&5
+echo "$as_me: error: internal error: not reached in cross-compile" >&2;}
+   { (exit 1); exit 1; }; }
 else
   cat >conftest.$ac_ext <<_ACEOF
 /* confdefs.h.  */
@@ -4826,8 +4805,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -4889,8 +4867,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -4930,8 +4907,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -4987,8 +4963,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -5028,8 +5003,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -5093,8 +5067,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -5127,13 +5100,9 @@ See \`config.log' for more details." >&2
 esac
 else
   if test "$cross_compiling" = yes; then
-  { { echo "$as_me:$LINENO: error: in \`$ac_pwd':" >&5
-echo "$as_me: error: in \`$ac_pwd':" >&2;}
-{ { echo "$as_me:$LINENO: error: cannot run test program while cross compiling
-See \`config.log' for more details." >&5
-echo "$as_me: error: cannot run test program while cross compiling
-See \`config.log' for more details." >&2;}
-   { (exit 1); exit 1; }; }; }
+  { { echo "$as_me:$LINENO: error: internal error: not reached in cross-compile" >&5
+echo "$as_me: error: internal error: not reached in cross-compile" >&2;}
+   { (exit 1); exit 1; }; }
 else
   cat >conftest.$ac_ext <<_ACEOF
 /* confdefs.h.  */
@@ -5246,8 +5215,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -5309,8 +5277,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -5350,8 +5317,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -5407,8 +5373,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -5448,8 +5413,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -5513,8 +5477,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -5547,13 +5510,9 @@ See \`config.log' for more details." >&2
 esac
 else
   if test "$cross_compiling" = yes; then
-  { { echo "$as_me:$LINENO: error: in \`$ac_pwd':" >&5
-echo "$as_me: error: in \`$ac_pwd':" >&2;}
-{ { echo "$as_me:$LINENO: error: cannot run test program while cross compiling
-See \`config.log' for more details." >&5
-echo "$as_me: error: cannot run test program while cross compiling
-See \`config.log' for more details." >&2;}
-   { (exit 1); exit 1; }; }; }
+  { { echo "$as_me:$LINENO: error: internal error: not reached in cross-compile" >&5
+echo "$as_me: error: internal error: not reached in cross-compile" >&2;}
+   { (exit 1); exit 1; }; }
 else
   cat >conftest.$ac_ext <<_ACEOF
 /* confdefs.h.  */
@@ -5666,8 +5625,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -5729,8 +5687,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -5770,8 +5727,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -5827,8 +5783,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -5868,8 +5823,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -5933,8 +5887,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -5967,13 +5920,9 @@ See \`config.log' for more details." >&2
 esac
 else
   if test "$cross_compiling" = yes; then
-  { { echo "$as_me:$LINENO: error: in \`$ac_pwd':" >&5
-echo "$as_me: error: in \`$ac_pwd':" >&2;}
-{ { echo "$as_me:$LINENO: error: cannot run test program while cross compiling
-See \`config.log' for more details." >&5
-echo "$as_me: error: cannot run test program while cross compiling
-See \`config.log' for more details." >&2;}
-   { (exit 1); exit 1; }; }; }
+  { { echo "$as_me:$LINENO: error: internal error: not reached in cross-compile" >&5
+echo "$as_me: error: internal error: not reached in cross-compile" >&2;}
+   { (exit 1); exit 1; }; }
 else
   cat >conftest.$ac_ext <<_ACEOF
 /* confdefs.h.  */
@@ -6086,8 +6035,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -6148,8 +6096,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -6211,8 +6158,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -6252,8 +6198,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -6309,8 +6254,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -6350,8 +6294,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -6415,8 +6358,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -6449,13 +6391,9 @@ See \`config.log' for more details." >&2
 esac
 else
   if test "$cross_compiling" = yes; then
-  { { echo "$as_me:$LINENO: error: in \`$ac_pwd':" >&5
-echo "$as_me: error: in \`$ac_pwd':" >&2;}
-{ { echo "$as_me:$LINENO: error: cannot run test program while cross compiling
-See \`config.log' for more details." >&5
-echo "$as_me: error: cannot run test program while cross compiling
-See \`config.log' for more details." >&2;}
-   { (exit 1); exit 1; }; }; }
+  { { echo "$as_me:$LINENO: error: internal error: not reached in cross-compile" >&5
+echo "$as_me: error: internal error: not reached in cross-compile" >&2;}
+   { (exit 1); exit 1; }; }
 else
   cat >conftest.$ac_ext <<_ACEOF
 /* confdefs.h.  */
@@ -6570,8 +6508,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -6632,8 +6569,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -6695,8 +6631,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -6736,8 +6671,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -6793,8 +6727,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -6834,8 +6767,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -6899,8 +6831,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -6933,13 +6864,9 @@ See \`config.log' for more details." >&2
 esac
 else
   if test "$cross_compiling" = yes; then
-  { { echo "$as_me:$LINENO: error: in \`$ac_pwd':" >&5
-echo "$as_me: error: in \`$ac_pwd':" >&2;}
-{ { echo "$as_me:$LINENO: error: cannot run test program while cross compiling
-See \`config.log' for more details." >&5
-echo "$as_me: error: cannot run test program while cross compiling
-See \`config.log' for more details." >&2;}
-   { (exit 1); exit 1; }; }; }
+  { { echo "$as_me:$LINENO: error: internal error: not reached in cross-compile" >&5
+echo "$as_me: error: internal error: not reached in cross-compile" >&2;}
+   { (exit 1); exit 1; }; }
 else
   cat >conftest.$ac_ext <<_ACEOF
 /* confdefs.h.  */
@@ -7069,8 +6996,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -7136,8 +7062,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -7200,8 +7125,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -7448,8 +7372,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -8835,8 +8758,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -9001,8 +8923,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -9063,8 +8984,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -9134,8 +9054,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -9410,8 +9329,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -9484,8 +9402,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -9527,8 +9444,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -9585,8 +9501,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -9729,8 +9644,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -9804,8 +9718,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -9859,8 +9772,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -9938,8 +9850,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -9993,8 +9904,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -10062,8 +9972,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -10201,8 +10110,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -10323,8 +10231,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -10389,8 +10296,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -10538,8 +10444,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -10656,8 +10561,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -10769,8 +10673,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -10928,8 +10831,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -10971,18 +10873,24 @@ else
   ac_cv_func_fork_works=cross
 else
   cat >conftest.$ac_ext <<_ACEOF
-/* By Ruediger Kuhlmann. */
-      #include <sys/types.h>
-      #if HAVE_UNISTD_H
-      # include <unistd.h>
-      #endif
-      /* Some systems only have a dummy stub for fork() */
-      int main ()
-      {
-	if (fork() < 0)
-	  exit (1);
-	exit (0);
-      }
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+$ac_includes_default
+int
+main ()
+{
+
+	  /* By Ruediger Kuhlmann. */
+	  if (fork() < 0)
+	    exit (1);
+	  exit (0);
+
+  ;
+  return 0;
+}
 _ACEOF
 rm -f conftest$ac_exeext
 if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
@@ -11801,8 +11709,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -11852,8 +11759,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -11943,8 +11849,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -12013,8 +11918,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -12077,8 +11981,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -12196,8 +12099,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -12282,8 +12184,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -12352,8 +12253,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -12428,8 +12328,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -12512,8 +12411,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -12594,8 +12492,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -12671,8 +12568,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -12738,8 +12634,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -12875,8 +12770,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -13152,8 +13046,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -13309,8 +13202,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -13593,8 +13485,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -13648,8 +13539,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -14359,13 +14249,13 @@ if test "${lt_cv_nm_interface+set}" = se
 else
   lt_cv_nm_interface="BSD nm"
   echo "int some_variable = 0;" > conftest.$ac_ext
-  (eval echo "\"\$as_me:14362: $ac_compile\"" >&5)
+  (eval echo "\"\$as_me:14252: $ac_compile\"" >&5)
   (eval "$ac_compile" 2>conftest.err)
   cat conftest.err >&5
-  (eval echo "\"\$as_me:14365: $NM \\\"conftest.$ac_objext\\\"\"" >&5)
+  (eval echo "\"\$as_me:14255: $NM \\\"conftest.$ac_objext\\\"\"" >&5)
   (eval "$NM \"conftest.$ac_objext\"" 2>conftest.err > conftest.out)
   cat conftest.err >&5
-  (eval echo "\"\$as_me:14368: output\"" >&5)
+  (eval echo "\"\$as_me:14258: output\"" >&5)
   cat conftest.out >&5
   if $GREP 'External.*some_variable' conftest.out > /dev/null; then
     lt_cv_nm_interface="MS dumpbin"
@@ -15522,7 +15412,7 @@ ia64-*-hpux*)
   ;;
 *-*-irix6*)
   # Find out which ABI we are using.
-  echo '#line 15525 "configure"' > conftest.$ac_ext
+  echo '#line 15415 "configure"' > conftest.$ac_ext
   if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   (eval $ac_compile) 2>&5
   ac_status=$?
@@ -15649,8 +15539,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -16203,8 +16092,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -16821,11 +16709,11 @@ else
    -e 's:.*FLAGS}\{0,1\} :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:16824: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:16712: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>conftest.err)
    ac_status=$?
    cat conftest.err >&5
-   echo "$as_me:16828: \$? = $ac_status" >&5
+   echo "$as_me:16716: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s "$ac_outfile"; then
      # The compiler can only warn and ignore the option if not recognized
      # So say no if there are warnings other than the usual output.
@@ -17160,11 +17048,11 @@ else
    -e 's:.*FLAGS}\{0,1\} :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:17163: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:17051: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>conftest.err)
    ac_status=$?
    cat conftest.err >&5
-   echo "$as_me:17167: \$? = $ac_status" >&5
+   echo "$as_me:17055: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s "$ac_outfile"; then
      # The compiler can only warn and ignore the option if not recognized
      # So say no if there are warnings other than the usual output.
@@ -17265,11 +17153,11 @@ else
    -e 's:.*FLAGS}\{0,1\} :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:17268: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:17156: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>out/conftest.err)
    ac_status=$?
    cat out/conftest.err >&5
-   echo "$as_me:17272: \$? = $ac_status" >&5
+   echo "$as_me:17160: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s out/conftest2.$ac_objext
    then
      # The compiler can only warn and ignore the option if not recognized
@@ -17320,11 +17208,11 @@ else
    -e 's:.*FLAGS}\{0,1\} :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:17323: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:17211: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>out/conftest.err)
    ac_status=$?
    cat out/conftest.err >&5
-   echo "$as_me:17327: \$? = $ac_status" >&5
+   echo "$as_me:17215: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s out/conftest2.$ac_objext
    then
      # The compiler can only warn and ignore the option if not recognized
@@ -17845,8 +17733,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -17914,8 +17801,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -18170,8 +18056,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -19143,8 +19028,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -19592,8 +19476,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -19696,8 +19579,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -19762,8 +19644,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -19856,8 +19737,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -19922,8 +19802,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -19989,8 +19868,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -20056,8 +19934,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -20132,7 +20009,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 20135 "configure"
+#line 20012 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -20228,7 +20105,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 20231 "configure"
+#line 20108 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -21797,6 +21674,45 @@ cat >>confdefs.h <<_ACEOF
 _ACEOF
 
 
+echo "$as_me:$LINENO: checking assembler for line table discriminator support" >&5
+echo $ECHO_N "checking assembler for line table discriminator support... $ECHO_C" >&6
+if test "${gcc_cv_as_discriminator+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  gcc_cv_as_discriminator=no
+    if test $in_tree_gas = yes; then
+    if test $gcc_cv_gas_vers -ge `expr \( \( 2 \* 1000 \) + 19 \) \* 1000 + 51`
+  then gcc_cv_as_discriminator=yes
+fi
+  elif test x$gcc_cv_as != x; then
+    echo '	.text
+	.file 1 "conf.c"
+	.loc 1 1 0 discriminator 1' > conftest.s
+    if { ac_try='$gcc_cv_as  -o conftest.o conftest.s >&5'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }
+    then
+	gcc_cv_as_discriminator=yes
+    else
+      echo "configure: failed program was" >&5
+      cat conftest.s >&5
+    fi
+    rm -f conftest.o conftest.s
+  fi
+fi
+echo "$as_me:$LINENO: result: $gcc_cv_as_discriminator" >&5
+echo "${ECHO_T}$gcc_cv_as_discriminator" >&6
+if test $gcc_cv_as_discriminator = yes; then
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_GAS_DISCRIMINATOR 1
+_ACEOF
+
+fi
+
 # Thread-local storage - the check is heavily parameterized.
 conftest_s=
 tls_first_major=
@@ -24216,8 +24132,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -24740,8 +24655,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -24796,8 +24710,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -24852,8 +24765,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -25923,11 +25835,6 @@ esac
 
 
 
-  if test x"$ac_file" != x-; then
-    { echo "$as_me:$LINENO: creating $ac_file" >&5
-echo "$as_me: creating $ac_file" >&6;}
-    rm -f "$ac_file"
-  fi
   # Let's still pretend it is `configure' which instantiates (i.e., don't
   # use $as_me), people would be surprised to read:
   #    /* config.h.  Generated by config.status.  */
@@ -25966,6 +25873,12 @@ echo "$as_me: error: cannot find input f
 	 fi;;
       esac
     done` || { (exit 1); exit 1; }
+
+  if test x"$ac_file" != x-; then
+    { echo "$as_me:$LINENO: creating $ac_file" >&5
+echo "$as_me: creating $ac_file" >&6;}
+    rm -f "$ac_file"
+  fi
 _ACEOF
 cat >>$CONFIG_STATUS <<_ACEOF
   sed "$ac_vpsub
Index: final.c
===================================================================
--- final.c	(revision 146448)
+++ final.c	(working copy)
@@ -130,6 +130,12 @@ rtx current_output_insn;
 /* Line number of last NOTE.  */
 static int last_linenum;
 
+/* Last discriminator written to assembly.  */
+static int last_discriminator;
+
+/* Discriminator of current block.  */
+static int discriminator;
+
 /* Highest line number in current block.  */
 static int high_block_linenum;
 
@@ -1486,6 +1492,7 @@ final_start_function (rtx first ATTRIBUT
 
   last_filename = locator_file (prologue_locator);
   last_linenum = locator_line (prologue_locator);
+  last_discriminator = discriminator = 0;
 
   high_block_linenum = high_function_linenum = last_linenum;
 
@@ -1842,6 +1849,8 @@ final_scan_insn (rtx insn, FILE *file, i
 	  else
 	    *seen |= SEEN_BB;
 
+          discriminator = NOTE_BASIC_BLOCK (insn)->discriminator;
+
 	  break;
 
 	case NOTE_INSN_EH_REGION_BEG:
@@ -2170,7 +2179,9 @@ final_scan_insn (rtx insn, FILE *file, i
 	   note in a row.  */
 	if (notice_source_line (insn))
 	  {
-	    (*debug_hooks->source_line) (last_linenum, last_filename);
+	    (*debug_hooks->source_line) (last_linenum,
+	                                 last_filename,
+	                                 last_discriminator);
 	  }
 
 	if (GET_CODE (body) == ASM_INPUT)
@@ -2687,11 +2698,13 @@ notice_source_line (rtx insn)
   if (filename
       && (force_source_line
 	  || filename != last_filename
-	  || last_linenum != linenum))
+	  || last_linenum != linenum
+	  || last_discriminator != discriminator))
     {
       force_source_line = false;
       last_filename = filename;
       last_linenum = linenum;
+      last_discriminator = discriminator;
       high_block_linenum = MAX (last_linenum, high_block_linenum);
       high_function_linenum = MAX (last_linenum, high_function_linenum);
       return true;
Index: vmsdbgout.c
===================================================================
--- vmsdbgout.c	(revision 146448)
+++ vmsdbgout.c	(working copy)
@@ -173,7 +173,7 @@ static void vmsdbgout_end_source_file (u
 static void vmsdbgout_begin_block (unsigned int, unsigned int);
 static void vmsdbgout_end_block (unsigned int, unsigned int);
 static bool vmsdbgout_ignore_block (const_tree);
-static void vmsdbgout_source_line (unsigned int, const char *);
+static void vmsdbgout_source_line (unsigned int, const char *, int);
 static void vmsdbgout_begin_prologue (unsigned int, const char *);
 static void vmsdbgout_end_prologue (unsigned int, const char *);
 static void vmsdbgout_end_function (unsigned int);
@@ -1297,7 +1297,7 @@ vmsdbgout_end_prologue (unsigned int lin
       ASM_OUTPUT_LABEL (asm_out_file, label);
 
       /* VMS PCA expects every PC range to correlate to some line and file.  */
-      vmsdbgout_source_line (line, file);
+      vmsdbgout_source_line (line, file, 0);
     }
 }
 
@@ -1331,7 +1331,7 @@ vmsdbgout_end_epilogue (unsigned int lin
       ASM_OUTPUT_LABEL (asm_out_file, label);
 
       /* VMS PCA expects every PC range to correlate to some line and file.  */
-      vmsdbgout_source_line (line, file);
+      vmsdbgout_source_line (line, file, 0);
     }
 }
 
@@ -1533,10 +1533,11 @@ lookup_filename (const char *file_name)
    'line_info_table' for later output of the .debug_line section.  */
 
 static void
-vmsdbgout_source_line (register unsigned line, register const char *filename)
+vmsdbgout_source_line (register unsigned line, register const char *filename,
+                       int discriminator)
 {
   if (write_symbols == VMS_AND_DWARF2_DEBUG)
-    (*dwarf2_debug_hooks.source_line) (line, filename);
+    (*dwarf2_debug_hooks.source_line) (line, filename, discriminator);
 
   if (debug_info_level >= DINFO_LEVEL_TERSE)
     {
Index: debug.c
===================================================================
--- debug.c	(revision 146448)
+++ debug.c	(working copy)
@@ -34,7 +34,7 @@ const struct gcc_debug_hooks do_nothing_
   debug_nothing_int_int,	         /* begin_block */
   debug_nothing_int_int,	         /* end_block */
   debug_true_const_tree,	         /* ignore_block */
-  debug_nothing_int_charstar,	         /* source_line */
+  debug_nothing_int_charstar_int,	 /* source_line */
   debug_nothing_int_charstar,	         /* begin_prologue */
   debug_nothing_int_charstar,	         /* end_prologue */
   debug_nothing_int_charstar,	         /* end_epilogue */
@@ -104,6 +104,13 @@ debug_nothing_int_charstar (unsigned int
 }
 
 void
+debug_nothing_int_charstar_int (unsigned int line ATTRIBUTE_UNUSED,
+			        const char *text ATTRIBUTE_UNUSED,
+			        int discriminator ATTRIBUTE_UNUSED)
+{
+}
+
+void
 debug_nothing_int (unsigned int line ATTRIBUTE_UNUSED)
 {
 }
Index: debug.h
===================================================================
--- debug.h	(revision 146448)
+++ debug.h	(working copy)
@@ -59,8 +59,9 @@ struct gcc_debug_hooks
      though the BLOCK information is messed up.  Defaults to true.  */
   bool (* ignore_block) (const_tree);
 
-  /* Record a source file location at (FILE, LINE).  */
-  void (* source_line) (unsigned int line, const char *file);
+  /* Record a source file location at (FILE, LINE, DISCRIMINATOR).  */
+  void (* source_line) (unsigned int line, const char *file,
+                        int discriminator);
 
   /* Called at start of prologue code.  LINE is the first line in the
      function.  This has been given the same prototype as source_line,
@@ -139,6 +140,7 @@ extern const struct gcc_debug_hooks *deb
 extern void debug_nothing_void (void);
 extern void debug_nothing_charstar (const char *);
 extern void debug_nothing_int_charstar (unsigned int, const char *);
+extern void debug_nothing_int_charstar_int (unsigned int, const char *, int);
 extern void debug_nothing_int (unsigned int);
 extern void debug_nothing_int_int (unsigned int, unsigned int);
 extern void debug_nothing_tree (tree);
Index: dbxout.c
===================================================================
--- dbxout.c	(revision 146448)
+++ dbxout.c	(working copy)
@@ -336,7 +336,7 @@ static void dbxout_handle_pch (unsigned)
 /* The debug hooks structure.  */
 #if defined (DBX_DEBUGGING_INFO)
 
-static void dbxout_source_line (unsigned int, const char *);
+static void dbxout_source_line (unsigned int, const char *, int);
 static void dbxout_begin_prologue (unsigned int, const char *);
 static void dbxout_source_file (const char *);
 static void dbxout_function_end (tree);
@@ -1268,7 +1268,7 @@ dbxout_begin_prologue (unsigned int line
   /* pre-increment the scope counter */
   scope_labelno++;
 
-  dbxout_source_line (lineno, filename);
+  dbxout_source_line (lineno, filename, 0);
   /* Output function begin block at function scope, referenced 
      by dbxout_block, dbxout_source_line and dbxout_function_end.  */
   emit_pending_bincls_if_required ();
@@ -1279,7 +1279,8 @@ dbxout_begin_prologue (unsigned int line
    number LINENO.  */
 
 static void
-dbxout_source_line (unsigned int lineno, const char *filename)
+dbxout_source_line (unsigned int lineno, const char *filename,
+                    int discriminator ATTRIBUTE_UNUSED)
 {
   dbxout_source_file (filename);
 
Index: xcoffout.c
===================================================================
--- xcoffout.c	(revision 146448)
+++ xcoffout.c	(working copy)
@@ -321,7 +321,8 @@ xcoffout_source_file (FILE *file, const 
 /* Output a line number symbol entry for location (FILENAME, LINE).  */
 
 void
-xcoffout_source_line (unsigned int line, const char *filename)
+xcoffout_source_line (unsigned int line, const char *filename,
+                      int discriminator ATTRIBUTE_UNUSED)
 {
   bool inline_p = (strcmp (xcoff_current_function_file, filename) != 0
 		   || (int) line < xcoff_begin_function_line);
Index: config.in
===================================================================
--- config.in	(revision 146448)
+++ config.in	(working copy)
@@ -844,6 +844,12 @@
 #endif
 
 
+/* Define if your assembler supports the .loc discriminator sub-directive. */
+#ifndef USED_FOR_TARGET
+#undef HAVE_GAS_DISCRIMINATOR
+#endif
+
+
 /* Define if your assembler uses the new HImode fild and fist notation. */
 #ifndef USED_FOR_TARGET
 #undef HAVE_GAS_FILDS_FISTS
Index: dwarf2out.c
===================================================================
--- dwarf2out.c	(revision 146448)
+++ dwarf2out.c	(working copy)
@@ -91,7 +91,7 @@ along with GCC; see the file COPYING3.  
 #include "input.h"
 
 #ifdef DWARF2_DEBUGGING_INFO
-static void dwarf2out_source_line (unsigned int, const char *);
+static void dwarf2out_source_line (unsigned int, const char *, int);
 #endif
 
 #ifndef DWARF2_FRAME_INFO
@@ -3243,7 +3243,7 @@ dwarf2out_begin_prologue (unsigned int l
      prologue case, not the eh frame case.  */
 #ifdef DWARF2_DEBUGGING_INFO
   if (file)
-    dwarf2out_source_line (line, file);
+    dwarf2out_source_line (line, file, 0);
 #endif
 
   if (dwarf2out_do_cfi_asm ())
@@ -15871,7 +15871,8 @@ dwarf2out_begin_function (tree fun)
    'line_info_table' for later output of the .debug_line section.  */
 
 static void
-dwarf2out_source_line (unsigned int line, const char *filename)
+dwarf2out_source_line (unsigned int line, const char *filename,
+                       int discriminator)
 {
   if (debug_info_level >= DINFO_LEVEL_NORMAL
       && line != 0)
@@ -15888,7 +15889,12 @@ dwarf2out_source_line (unsigned int line
       if (DWARF2_ASM_LINE_DEBUG_INFO)
 	{
 	  /* Emit the .loc directive understood by GNU as.  */
-	  fprintf (asm_out_file, "\t.loc %d %d 0\n", file_num, line);
+	  fprintf (asm_out_file, "\t.loc %d %d 0", file_num, line);
+#ifdef HAVE_GAS_DISCRIMINATOR
+	  if (discriminator != 0)
+	    fprintf (asm_out_file, " discriminator %d", discriminator);
+#endif /* HAVE_GAS_DISCRIMINATOR */
+	  fputc ('\n', asm_out_file);
 
 	  /* Indicate that line number info exists.  */
 	  line_info_table_in_use++;
Index: gimple-pretty-print.c
===================================================================
--- gimple-pretty-print.c	(revision 146448)
+++ gimple-pretty-print.c	(working copy)
@@ -1583,6 +1583,12 @@ dump_bb_header (pretty_printer *buffer, 
 		pp_decimal_int (buffer, get_lineno (gsi_stmt (gsi)));
 		break;
 	      }
+
+          if (bb->discriminator)
+            {
+              pp_string (buffer, ", discriminator ");
+	      pp_decimal_int (buffer, bb->discriminator);
+            }
 	}
       newline_and_indent (buffer, indent);
 
Index: configure.ac
===================================================================
--- configure.ac	(revision 146448)
+++ configure.ac	(working copy)
@@ -2382,6 +2382,15 @@ AC_DEFINE_UNQUOTED(HAVE_COMDAT_GROUP,
   [`if test $gcc_cv_as_comdat_group = yes || test $gcc_cv_as_comdat_group_percent = yes; then echo 1; else echo 0; fi`],
 [Define 0/1 if your assembler and linker support COMDAT groups.])
 
+gcc_GAS_CHECK_FEATURE([line table discriminator support],
+ gcc_cv_as_discriminator,
+ [2,19,51],,
+[	.text
+	.file 1 "conf.c"
+	.loc 1 1 0 discriminator 1],,
+[AC_DEFINE(HAVE_GAS_DISCRIMINATOR, 1,
+  [Define if your assembler supports the .loc discriminator sub-directive.])])
+
 # Thread-local storage - the check is heavily parameterized.
 conftest_s=
 tls_first_major=
Index: sdbout.c
===================================================================
--- sdbout.c	(revision 146448)
+++ sdbout.c	(working copy)
@@ -117,7 +117,7 @@ static void sdbout_start_source_file	(un
 static void sdbout_end_source_file	(unsigned int);
 static void sdbout_begin_block		(unsigned int, unsigned int);
 static void sdbout_end_block		(unsigned int, unsigned int);
-static void sdbout_source_line		(unsigned int, const char *);
+static void sdbout_source_line		(unsigned int, const char *, int);
 static void sdbout_end_epilogue		(unsigned int, const char *);
 static void sdbout_global_decl		(tree);
 #ifndef MIPS_DEBUGGING_INFO
@@ -1541,7 +1541,8 @@ sdbout_end_block (unsigned int line, uns
    number LINE.  */
 
 static void
-sdbout_source_line (unsigned int line, const char *filename ATTRIBUTE_UNUSED)
+sdbout_source_line (unsigned int line, const char *filename ATTRIBUTE_UNUSED,
+                    int discriminator ATTRIBUTE_UNUSED)
 {
   /* COFF relative line numbers must be positive.  */
   if ((int) line > sdb_begin_function_line)
Index: basic-block.h
===================================================================
--- basic-block.h	(revision 146448)
+++ basic-block.h	(working copy)
@@ -253,6 +253,9 @@ struct basic_block_def GTY((chain_next (
   /* Expected frequency.  Normalized to be in range 0 to BB_FREQ_MAX.  */
   int frequency;
 
+  /* The discriminator for this block.  */
+  int discriminator;
+
   /* Various flags.  See BB_* below.  */
   int flags;
 };
Index: tree-cfg.c
===================================================================
--- tree-cfg.c	(revision 146448)
+++ tree-cfg.c	(working copy)
@@ -82,6 +82,14 @@ static struct cfg_stats_d cfg_stats;
 /* Nonzero if we found a computed goto while building basic blocks.  */
 static bool found_computed_goto;
 
+/* Hash table to store last discriminator assigned for each locus.  */
+struct locus_discrim_map
+{
+  location_t locus;
+  int discriminator;
+};
+static htab_t discriminator_per_locus;
+
 /* Basic blocks and flowgraphs.  */
 static void make_blocks (gimple_seq);
 static void factor_computed_gotos (void);
@@ -91,6 +99,9 @@ static void make_edges (void);
 static void make_cond_expr_edges (basic_block);
 static void make_gimple_switch_edges (basic_block);
 static void make_goto_expr_edges (basic_block);
+static unsigned int locus_map_hash (const void*);
+static int locus_map_eq (const void*, const void*);
+static void assign_discriminator (location_t, basic_block);
 static edge gimple_redirect_edge_and_branch (edge, basic_block);
 static edge gimple_try_redirect_by_replacing_jump (edge, basic_block);
 static unsigned int split_critical_edges (void);
@@ -100,6 +111,7 @@ static inline bool stmt_starts_bb_p (gim
 static int gimple_verify_flow_info (void);
 static void gimple_make_forwarder_block (edge);
 static void gimple_cfg2vcg (FILE *);
+static gimple first_non_label_stmt (basic_block);
 
 /* Flowgraph optimization and cleanup.  */
 static void gimple_merge_blocks (basic_block, basic_block);
@@ -193,8 +205,11 @@ build_gimple_cfg (gimple_seq seq)
   group_case_labels ();
 
   /* Create the edges of the flowgraph.  */
+  discriminator_per_locus = htab_create (13, locus_map_hash, locus_map_eq,
+                                         free);
   make_edges ();
   cleanup_dead_labels ();
+  htab_delete (discriminator_per_locus);
 
   /* Debugging dumps.  */
 
@@ -650,7 +665,11 @@ make_edges (void)
 	fallthru = true;
 
       if (fallthru)
-	make_edge (bb, bb->next_bb, EDGE_FALLTHRU);
+        {
+	  make_edge (bb, bb->next_bb, EDGE_FALLTHRU);
+	  if (last)
+            assign_discriminator (gimple_location (last), bb->next_bb);
+	}
     }
 
   if (root_omp_region)
@@ -660,6 +679,67 @@ make_edges (void)
   fold_cond_expr_cond ();
 }
 
+/* Trivial hash function for a location_t.  */
+
+static unsigned int
+locus_map_hash (const void* item)
+{
+  return ((const struct locus_discrim_map*) item)->locus;
+}
+
+/* Equality function for the locus-to-discriminator map.  */
+
+static int
+locus_map_eq (const void* va, const void* vb)
+{
+  const struct locus_discrim_map* a = (const struct locus_discrim_map*) va;
+  const struct locus_discrim_map* b = (const struct locus_discrim_map*) vb;
+  return a->locus == b->locus;
+}
+
+/* Find the next available discriminator value for LOCUS.  The
+   discriminator distinguishes among several basic blocks that
+   share a common locus, allowing for more accurate sample-based
+   profiling.  */
+
+static int
+next_discriminator_for_locus (location_t locus)
+{
+  struct locus_discrim_map item;
+  struct locus_discrim_map** slot;
+
+  item.locus = locus;
+  item.discriminator = 0;
+  slot = (struct locus_discrim_map**)
+      htab_find_slot_with_hash (discriminator_per_locus, (void *) &item,
+                                (hashval_t) locus, INSERT);
+  gcc_assert (slot);
+  if (*slot == HTAB_EMPTY_ENTRY)
+    {
+      *slot = XNEW (struct locus_discrim_map);
+      gcc_assert (*slot);
+      (*slot)->locus = locus;
+      (*slot)->discriminator = 0;
+    }
+  (*slot)->discriminator++;
+  return (*slot)->discriminator;
+}
+
+/* Assign a unique discriminator value to block BB if it begins at the same
+   LOCUS as its predecessor block.  */
+
+static void
+assign_discriminator (location_t locus, basic_block bb)
+{
+  gimple to_stmt;
+
+  if (bb->discriminator != 0)
+    return;
+
+  to_stmt = first_non_label_stmt (bb);
+  if (to_stmt && locus == gimple_location (to_stmt))
+    bb->discriminator = next_discriminator_for_locus (locus);
+}
 
 /* Create the edges for a GIMPLE_COND starting at block BB.  */
 
@@ -671,10 +751,13 @@ make_cond_expr_edges (basic_block bb)
   basic_block then_bb, else_bb;
   tree then_label, else_label;
   edge e;
+  location_t entry_locus;
 
   gcc_assert (entry);
   gcc_assert (gimple_code (entry) == GIMPLE_COND);
 
+  entry_locus = gimple_location (entry);
+
   /* Entry basic blocks for each component.  */
   then_label = gimple_cond_true_label (entry);
   else_label = gimple_cond_false_label (entry);
@@ -684,12 +767,14 @@ make_cond_expr_edges (basic_block bb)
   else_stmt = first_stmt (else_bb);
 
   e = make_edge (bb, then_bb, EDGE_TRUE_VALUE);
+  assign_discriminator (entry_locus, then_bb);
   e->goto_locus = gimple_location (then_stmt);
   if (e->goto_locus)
     e->goto_block = gimple_block (then_stmt);
   e = make_edge (bb, else_bb, EDGE_FALSE_VALUE);
   if (e)
     {
+      assign_discriminator (entry_locus, else_bb);
       e->goto_locus = gimple_location (else_stmt);
       if (e->goto_locus)
 	e->goto_block = gimple_block (else_stmt);
@@ -799,8 +884,11 @@ static void
 make_gimple_switch_edges (basic_block bb)
 {
   gimple entry = last_stmt (bb);
+  location_t entry_locus;
   size_t i, n;
 
+  entry_locus = gimple_location (entry);
+
   n = gimple_switch_num_labels (entry);
 
   for (i = 0; i < n; ++i)
@@ -808,6 +896,7 @@ make_gimple_switch_edges (basic_block bb
       tree lab = CASE_LABEL (gimple_switch_label (entry, i));
       basic_block label_bb = label_to_block (lab);
       make_edge (bb, label_bb, 0);
+      assign_discriminator (entry_locus, label_bb);
     }
 }
 
@@ -880,8 +969,10 @@ make_goto_expr_edges (basic_block bb)
   if (simple_goto_p (goto_t))
     {
       tree dest = gimple_goto_dest (goto_t);
-      edge e = make_edge (bb, label_to_block (dest), EDGE_FALLTHRU);
+      basic_block label_bb = label_to_block (dest);
+      edge e = make_edge (bb, label_bb, EDGE_FALLTHRU);
       e->goto_locus = gimple_location (goto_t);
+      assign_discriminator (e->goto_locus, label_bb);
       if (e->goto_locus)
 	e->goto_block = gimple_block (goto_t);
       gsi_remove (&last, true);
@@ -2701,6 +2792,17 @@ first_stmt (basic_block bb)
   return !gsi_end_p (i) ? gsi_stmt (i) : NULL;
 }
 
+/* Return the first non-label statement in basic block BB.  */
+
+static gimple
+first_non_label_stmt (basic_block bb)
+{
+  gimple_stmt_iterator i = gsi_start_bb (bb);
+  while (!gsi_end_p (i) && gimple_code (gsi_stmt (i)) == GIMPLE_LABEL)
+    gsi_next (&i);
+  return !gsi_end_p (i) ? gsi_stmt (i) : NULL;
+}
+
 /* Return the last statement in basic block BB.  */
 
 gimple

^ permalink raw reply	[flat|nested] 15+ messages in thread

* Re: [patch] Add discriminators to DWARF line table
  2009-04-21 23:16 [patch] Add discriminators to DWARF line table Cary Coutant
@ 2009-04-22  4:19 ` Daniel Jacobowitz
  2009-04-22 18:05   ` Cary Coutant
  0 siblings, 1 reply; 15+ messages in thread
From: Daniel Jacobowitz @ 2009-04-22  4:19 UTC (permalink / raw)
  To: Cary Coutant; +Cc: gcc-patches

On Tue, Apr 21, 2009 at 04:16:00PM -0700, Cary Coutant wrote:
> This patch adds a discriminator field to the basic block structure,
> and assigns discriminators during gimplification. Whenever we add an
> edge between two basic blocks where the end of the "from" block and
> the entry of the "to" block have the same source position, we assign a
> new discriminator to the "to" block. This value gets picked up at the
> end of the compilation and added to the .loc directive in the assembly
> output. I've added a configure check to make sure that discriminator
> support is available in the target assembler.

Why is this only necessary when the edge source and destination are
part of the same line?  Imagine a conditional branch on line 5:

line 5 -> line 6 first half -> line 7
line 5 -> line 6 second half -> line 7

If we don't discriminate between the two 'line 6' blocks, then
profiling won't tell us which edge was taken out of line 5.  I
don't have a straightforward C example, but I'm sure one could be
constructed given optimization.  Perhaps:

  x = (y > 0);
  j = x ? foo () : bar ();
  done ();

Anyway, you get the picture.


-- 
Daniel Jacobowitz
CodeSourcery

^ permalink raw reply	[flat|nested] 15+ messages in thread

* Re: [patch] Add discriminators to DWARF line table
  2009-04-22  4:19 ` Daniel Jacobowitz
@ 2009-04-22 18:05   ` Cary Coutant
  2009-04-23  0:39     ` Cary Coutant
  0 siblings, 1 reply; 15+ messages in thread
From: Cary Coutant @ 2009-04-22 18:05 UTC (permalink / raw)
  To: Cary Coutant, gcc-patches

> Why is this only necessary when the edge source and destination are
> part of the same line?  Imagine a conditional branch on line 5:
>
> line 5 -> line 6 first half -> line 7
> line 5 -> line 6 second half -> line 7
>
> If we don't discriminate between the two 'line 6' blocks, then
> profiling won't tell us which edge was taken out of line 5.  I
> don't have a straightforward C example, but I'm sure one could be
> constructed given optimization.  Perhaps:
>
>  x = (y > 0);
>  j = x ? foo () : bar ();
>  done ();
>
> Anyway, you get the picture.

Good example -- I'll have to look at it more carefully, but I think
that at the point I'm assigning discriminators, the edges will still
appear to be from line 6 to line 6, and we'll get unique
discriminators assigned for each block. Any subsequent optimizations
will preserve those discriminators as long as the blocks themselves
don't get removed at some point (a problem I acknowledged that I may
need to fix later).

-cary

^ permalink raw reply	[flat|nested] 15+ messages in thread

* Re: [patch] Add discriminators to DWARF line table
  2009-04-22 18:05   ` Cary Coutant
@ 2009-04-23  0:39     ` Cary Coutant
  2009-04-30  0:54       ` Cary Coutant
  0 siblings, 1 reply; 15+ messages in thread
From: Cary Coutant @ 2009-04-23  0:39 UTC (permalink / raw)
  To: gcc-patches

[-- Attachment #1: Type: text/plain, Size: 2817 bytes --]

> Good example -- I'll have to look at it more carefully, but I think
> that at the point I'm assigning discriminators, the edges will still
> appear to be from line 6 to line 6, and we'll get unique
> discriminators assigned for each block. Any subsequent optimizations
> will preserve those discriminators as long as the blocks themselves
> don't get removed at some point (a problem I acknowledged that I may
> need to fix later).

I've verified that this is the case, but I did find one thing that I
needed to change. The simple comparison of loci fails if just the
column number differs, so I needed to make the test for same line
number a bit more intelligent. Here's a revised patch that checks just
the file and line number for equality. (The only differences from the
first patch are in the new same_line_p function and in the
assign_discriminator function.)

One could say that as long as the column number is different, we don't
actually need a discriminator, but gcc currently does not output the
column information to DWARF, and I don't want to require it to, as
that would bloat the line number table far more than the relatively
rare discriminator.

-cary


	* basic-block.h (struct basic_block_def): Add discriminator field.
	* dbxout.c (dbxout_source_line): Add new parameter.  Change all
	callers.
	* debug.c (do_nothing_debug_hooks): Add additional entry.
	(debug_nothing_int_charstar_int): New function.
	* debug.h (struct gcc_debug_hooks): Add parameter to source_line
	hook.
	(debug_nothing_int_charstar_int): New declaration.
	* dwarf2out.c (dwarf2out_source_line): Add new parameter.  Write
	discriminator value in .loc directive.
	* final.c (last_discriminator): New variable.
	(discriminator): New variable.
	(final_start_function): Initialize above variables, pass current
	discriminator to debug hook.
	(notice_source_line): Check for discriminator change.
	* gimple-pretty-print.c (dump_bb_header): Print discriminator value.
	* sdbout.c (sdbout_source_line): New parameter.
	* tree-cfg.c (struct locus_discrim_map): New structure type.
	(discriminator_per_locus): New hash table.
	(build_gimple_cfg): Allocate and free discriminator hash table.
	(make_edges): Call assign_discriminator.
	(locus_map_hash): New function.
	(locus_map_eq): New function.
	(next_discriminator_for_locus): New function.
	(same_line_p): New function.
	(assign_discriminator): New function.
	(make_cond_expr_edges): Call assign_discriminator.
	(make_gimple_switch_edges): Likewise.
	(first_non_label_stmt): New function.
	* vmsdbgout.c (vmsdbgout_source_line): Add new parameter.  Change
	all callers.
	* xcoffout.c (xcoffout_source_line): Add new parameter.

	* configure.ac (gcc_cv_as_discriminator): New configury check for
	gas support for discriminator.
	* configure: Regenerate.
	* config.in: Regenerate.

[-- Attachment #2: gcc-discrim-patch-2.txt --]
[-- Type: text/plain, Size: 74554 bytes --]

Index: configure
===================================================================
--- configure	(revision 146448)
+++ configure	(working copy)
@@ -1231,7 +1231,7 @@ esac
     else
       echo "$as_me: WARNING: no configuration information is in $ac_dir" >&2
     fi
-    cd $ac_popdir
+    cd "$ac_popdir"
   done
 fi
 
@@ -2647,8 +2647,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -2706,8 +2705,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -2823,8 +2821,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -2878,8 +2875,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -2924,8 +2920,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -2969,8 +2964,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -3618,8 +3612,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -3789,8 +3782,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -3854,8 +3846,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -4019,8 +4010,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -4330,8 +4320,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -4406,8 +4395,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -4469,8 +4457,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -4510,8 +4497,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -4567,8 +4553,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -4608,8 +4593,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -4673,8 +4657,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -4707,13 +4690,9 @@ See \`config.log' for more details." >&2
 esac
 else
   if test "$cross_compiling" = yes; then
-  { { echo "$as_me:$LINENO: error: in \`$ac_pwd':" >&5
-echo "$as_me: error: in \`$ac_pwd':" >&2;}
-{ { echo "$as_me:$LINENO: error: cannot run test program while cross compiling
-See \`config.log' for more details." >&5
-echo "$as_me: error: cannot run test program while cross compiling
-See \`config.log' for more details." >&2;}
-   { (exit 1); exit 1; }; }; }
+  { { echo "$as_me:$LINENO: error: internal error: not reached in cross-compile" >&5
+echo "$as_me: error: internal error: not reached in cross-compile" >&2;}
+   { (exit 1); exit 1; }; }
 else
   cat >conftest.$ac_ext <<_ACEOF
 /* confdefs.h.  */
@@ -4826,8 +4805,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -4889,8 +4867,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -4930,8 +4907,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -4987,8 +4963,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -5028,8 +5003,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -5093,8 +5067,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -5127,13 +5100,9 @@ See \`config.log' for more details." >&2
 esac
 else
   if test "$cross_compiling" = yes; then
-  { { echo "$as_me:$LINENO: error: in \`$ac_pwd':" >&5
-echo "$as_me: error: in \`$ac_pwd':" >&2;}
-{ { echo "$as_me:$LINENO: error: cannot run test program while cross compiling
-See \`config.log' for more details." >&5
-echo "$as_me: error: cannot run test program while cross compiling
-See \`config.log' for more details." >&2;}
-   { (exit 1); exit 1; }; }; }
+  { { echo "$as_me:$LINENO: error: internal error: not reached in cross-compile" >&5
+echo "$as_me: error: internal error: not reached in cross-compile" >&2;}
+   { (exit 1); exit 1; }; }
 else
   cat >conftest.$ac_ext <<_ACEOF
 /* confdefs.h.  */
@@ -5246,8 +5215,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -5309,8 +5277,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -5350,8 +5317,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -5407,8 +5373,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -5448,8 +5413,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -5513,8 +5477,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -5547,13 +5510,9 @@ See \`config.log' for more details." >&2
 esac
 else
   if test "$cross_compiling" = yes; then
-  { { echo "$as_me:$LINENO: error: in \`$ac_pwd':" >&5
-echo "$as_me: error: in \`$ac_pwd':" >&2;}
-{ { echo "$as_me:$LINENO: error: cannot run test program while cross compiling
-See \`config.log' for more details." >&5
-echo "$as_me: error: cannot run test program while cross compiling
-See \`config.log' for more details." >&2;}
-   { (exit 1); exit 1; }; }; }
+  { { echo "$as_me:$LINENO: error: internal error: not reached in cross-compile" >&5
+echo "$as_me: error: internal error: not reached in cross-compile" >&2;}
+   { (exit 1); exit 1; }; }
 else
   cat >conftest.$ac_ext <<_ACEOF
 /* confdefs.h.  */
@@ -5666,8 +5625,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -5729,8 +5687,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -5770,8 +5727,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -5827,8 +5783,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -5868,8 +5823,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -5933,8 +5887,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -5967,13 +5920,9 @@ See \`config.log' for more details." >&2
 esac
 else
   if test "$cross_compiling" = yes; then
-  { { echo "$as_me:$LINENO: error: in \`$ac_pwd':" >&5
-echo "$as_me: error: in \`$ac_pwd':" >&2;}
-{ { echo "$as_me:$LINENO: error: cannot run test program while cross compiling
-See \`config.log' for more details." >&5
-echo "$as_me: error: cannot run test program while cross compiling
-See \`config.log' for more details." >&2;}
-   { (exit 1); exit 1; }; }; }
+  { { echo "$as_me:$LINENO: error: internal error: not reached in cross-compile" >&5
+echo "$as_me: error: internal error: not reached in cross-compile" >&2;}
+   { (exit 1); exit 1; }; }
 else
   cat >conftest.$ac_ext <<_ACEOF
 /* confdefs.h.  */
@@ -6086,8 +6035,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -6148,8 +6096,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -6211,8 +6158,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -6252,8 +6198,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -6309,8 +6254,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -6350,8 +6294,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -6415,8 +6358,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -6449,13 +6391,9 @@ See \`config.log' for more details." >&2
 esac
 else
   if test "$cross_compiling" = yes; then
-  { { echo "$as_me:$LINENO: error: in \`$ac_pwd':" >&5
-echo "$as_me: error: in \`$ac_pwd':" >&2;}
-{ { echo "$as_me:$LINENO: error: cannot run test program while cross compiling
-See \`config.log' for more details." >&5
-echo "$as_me: error: cannot run test program while cross compiling
-See \`config.log' for more details." >&2;}
-   { (exit 1); exit 1; }; }; }
+  { { echo "$as_me:$LINENO: error: internal error: not reached in cross-compile" >&5
+echo "$as_me: error: internal error: not reached in cross-compile" >&2;}
+   { (exit 1); exit 1; }; }
 else
   cat >conftest.$ac_ext <<_ACEOF
 /* confdefs.h.  */
@@ -6570,8 +6508,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -6632,8 +6569,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -6695,8 +6631,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -6736,8 +6671,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -6793,8 +6727,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -6834,8 +6767,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -6899,8 +6831,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -6933,13 +6864,9 @@ See \`config.log' for more details." >&2
 esac
 else
   if test "$cross_compiling" = yes; then
-  { { echo "$as_me:$LINENO: error: in \`$ac_pwd':" >&5
-echo "$as_me: error: in \`$ac_pwd':" >&2;}
-{ { echo "$as_me:$LINENO: error: cannot run test program while cross compiling
-See \`config.log' for more details." >&5
-echo "$as_me: error: cannot run test program while cross compiling
-See \`config.log' for more details." >&2;}
-   { (exit 1); exit 1; }; }; }
+  { { echo "$as_me:$LINENO: error: internal error: not reached in cross-compile" >&5
+echo "$as_me: error: internal error: not reached in cross-compile" >&2;}
+   { (exit 1); exit 1; }; }
 else
   cat >conftest.$ac_ext <<_ACEOF
 /* confdefs.h.  */
@@ -7069,8 +6996,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -7136,8 +7062,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -7200,8 +7125,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -7448,8 +7372,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -8835,8 +8758,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -9001,8 +8923,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -9063,8 +8984,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -9134,8 +9054,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -9410,8 +9329,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -9484,8 +9402,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -9527,8 +9444,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -9585,8 +9501,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -9729,8 +9644,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -9804,8 +9718,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -9859,8 +9772,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -9938,8 +9850,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -9993,8 +9904,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -10062,8 +9972,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -10201,8 +10110,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -10323,8 +10231,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -10389,8 +10296,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -10538,8 +10444,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -10656,8 +10561,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -10769,8 +10673,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -10928,8 +10831,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -10971,18 +10873,24 @@ else
   ac_cv_func_fork_works=cross
 else
   cat >conftest.$ac_ext <<_ACEOF
-/* By Ruediger Kuhlmann. */
-      #include <sys/types.h>
-      #if HAVE_UNISTD_H
-      # include <unistd.h>
-      #endif
-      /* Some systems only have a dummy stub for fork() */
-      int main ()
-      {
-	if (fork() < 0)
-	  exit (1);
-	exit (0);
-      }
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+$ac_includes_default
+int
+main ()
+{
+
+	  /* By Ruediger Kuhlmann. */
+	  if (fork() < 0)
+	    exit (1);
+	  exit (0);
+
+  ;
+  return 0;
+}
 _ACEOF
 rm -f conftest$ac_exeext
 if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
@@ -11801,8 +11709,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -11852,8 +11759,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -11943,8 +11849,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -12013,8 +11918,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -12077,8 +11981,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -12196,8 +12099,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -12282,8 +12184,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -12352,8 +12253,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -12428,8 +12328,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -12512,8 +12411,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -12594,8 +12492,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -12671,8 +12568,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -12738,8 +12634,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -12875,8 +12770,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -13152,8 +13046,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_c
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -13309,8 +13202,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -13593,8 +13485,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -13648,8 +13539,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -14359,13 +14249,13 @@ if test "${lt_cv_nm_interface+set}" = se
 else
   lt_cv_nm_interface="BSD nm"
   echo "int some_variable = 0;" > conftest.$ac_ext
-  (eval echo "\"\$as_me:14362: $ac_compile\"" >&5)
+  (eval echo "\"\$as_me:14252: $ac_compile\"" >&5)
   (eval "$ac_compile" 2>conftest.err)
   cat conftest.err >&5
-  (eval echo "\"\$as_me:14365: $NM \\\"conftest.$ac_objext\\\"\"" >&5)
+  (eval echo "\"\$as_me:14255: $NM \\\"conftest.$ac_objext\\\"\"" >&5)
   (eval "$NM \"conftest.$ac_objext\"" 2>conftest.err > conftest.out)
   cat conftest.err >&5
-  (eval echo "\"\$as_me:14368: output\"" >&5)
+  (eval echo "\"\$as_me:14258: output\"" >&5)
   cat conftest.out >&5
   if $GREP 'External.*some_variable' conftest.out > /dev/null; then
     lt_cv_nm_interface="MS dumpbin"
@@ -15522,7 +15412,7 @@ ia64-*-hpux*)
   ;;
 *-*-irix6*)
   # Find out which ABI we are using.
-  echo '#line 15525 "configure"' > conftest.$ac_ext
+  echo '#line 15415 "configure"' > conftest.$ac_ext
   if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   (eval $ac_compile) 2>&5
   ac_status=$?
@@ -15649,8 +15539,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -16203,8 +16092,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -16821,11 +16709,11 @@ else
    -e 's:.*FLAGS}\{0,1\} :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:16824: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:16712: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>conftest.err)
    ac_status=$?
    cat conftest.err >&5
-   echo "$as_me:16828: \$? = $ac_status" >&5
+   echo "$as_me:16716: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s "$ac_outfile"; then
      # The compiler can only warn and ignore the option if not recognized
      # So say no if there are warnings other than the usual output.
@@ -17160,11 +17048,11 @@ else
    -e 's:.*FLAGS}\{0,1\} :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:17163: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:17051: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>conftest.err)
    ac_status=$?
    cat conftest.err >&5
-   echo "$as_me:17167: \$? = $ac_status" >&5
+   echo "$as_me:17055: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s "$ac_outfile"; then
      # The compiler can only warn and ignore the option if not recognized
      # So say no if there are warnings other than the usual output.
@@ -17265,11 +17153,11 @@ else
    -e 's:.*FLAGS}\{0,1\} :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:17268: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:17156: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>out/conftest.err)
    ac_status=$?
    cat out/conftest.err >&5
-   echo "$as_me:17272: \$? = $ac_status" >&5
+   echo "$as_me:17160: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s out/conftest2.$ac_objext
    then
      # The compiler can only warn and ignore the option if not recognized
@@ -17320,11 +17208,11 @@ else
    -e 's:.*FLAGS}\{0,1\} :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:17323: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:17211: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>out/conftest.err)
    ac_status=$?
    cat out/conftest.err >&5
-   echo "$as_me:17327: \$? = $ac_status" >&5
+   echo "$as_me:17215: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s out/conftest2.$ac_objext
    then
      # The compiler can only warn and ignore the option if not recognized
@@ -17845,8 +17733,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -17914,8 +17801,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -18170,8 +18056,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -19143,8 +19028,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -19592,8 +19476,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -19696,8 +19579,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -19762,8 +19644,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -19856,8 +19737,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -19922,8 +19802,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -19989,8 +19868,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -20056,8 +19934,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -20132,7 +20009,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 20135 "configure"
+#line 20012 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -20228,7 +20105,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 20231 "configure"
+#line 20108 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -21797,6 +21674,45 @@ cat >>confdefs.h <<_ACEOF
 _ACEOF
 
 
+echo "$as_me:$LINENO: checking assembler for line table discriminator support" >&5
+echo $ECHO_N "checking assembler for line table discriminator support... $ECHO_C" >&6
+if test "${gcc_cv_as_discriminator+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  gcc_cv_as_discriminator=no
+    if test $in_tree_gas = yes; then
+    if test $gcc_cv_gas_vers -ge `expr \( \( 2 \* 1000 \) + 19 \) \* 1000 + 51`
+  then gcc_cv_as_discriminator=yes
+fi
+  elif test x$gcc_cv_as != x; then
+    echo '	.text
+	.file 1 "conf.c"
+	.loc 1 1 0 discriminator 1' > conftest.s
+    if { ac_try='$gcc_cv_as  -o conftest.o conftest.s >&5'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }
+    then
+	gcc_cv_as_discriminator=yes
+    else
+      echo "configure: failed program was" >&5
+      cat conftest.s >&5
+    fi
+    rm -f conftest.o conftest.s
+  fi
+fi
+echo "$as_me:$LINENO: result: $gcc_cv_as_discriminator" >&5
+echo "${ECHO_T}$gcc_cv_as_discriminator" >&6
+if test $gcc_cv_as_discriminator = yes; then
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_GAS_DISCRIMINATOR 1
+_ACEOF
+
+fi
+
 # Thread-local storage - the check is heavily parameterized.
 conftest_s=
 tls_first_major=
@@ -24216,8 +24132,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -24740,8 +24655,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -24796,8 +24710,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -24852,8 +24765,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_l
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -25923,11 +25835,6 @@ esac
 
 
 
-  if test x"$ac_file" != x-; then
-    { echo "$as_me:$LINENO: creating $ac_file" >&5
-echo "$as_me: creating $ac_file" >&6;}
-    rm -f "$ac_file"
-  fi
   # Let's still pretend it is `configure' which instantiates (i.e., don't
   # use $as_me), people would be surprised to read:
   #    /* config.h.  Generated by config.status.  */
@@ -25966,6 +25873,12 @@ echo "$as_me: error: cannot find input f
 	 fi;;
       esac
     done` || { (exit 1); exit 1; }
+
+  if test x"$ac_file" != x-; then
+    { echo "$as_me:$LINENO: creating $ac_file" >&5
+echo "$as_me: creating $ac_file" >&6;}
+    rm -f "$ac_file"
+  fi
 _ACEOF
 cat >>$CONFIG_STATUS <<_ACEOF
   sed "$ac_vpsub
Index: final.c
===================================================================
--- final.c	(revision 146448)
+++ final.c	(working copy)
@@ -130,6 +130,12 @@ rtx current_output_insn;
 /* Line number of last NOTE.  */
 static int last_linenum;
 
+/* Last discriminator written to assembly.  */
+static int last_discriminator;
+
+/* Discriminator of current block.  */
+static int discriminator;
+
 /* Highest line number in current block.  */
 static int high_block_linenum;
 
@@ -1486,6 +1492,7 @@ final_start_function (rtx first ATTRIBUT
 
   last_filename = locator_file (prologue_locator);
   last_linenum = locator_line (prologue_locator);
+  last_discriminator = discriminator = 0;
 
   high_block_linenum = high_function_linenum = last_linenum;
 
@@ -1842,6 +1849,8 @@ final_scan_insn (rtx insn, FILE *file, i
 	  else
 	    *seen |= SEEN_BB;
 
+          discriminator = NOTE_BASIC_BLOCK (insn)->discriminator;
+
 	  break;
 
 	case NOTE_INSN_EH_REGION_BEG:
@@ -2170,7 +2179,9 @@ final_scan_insn (rtx insn, FILE *file, i
 	   note in a row.  */
 	if (notice_source_line (insn))
 	  {
-	    (*debug_hooks->source_line) (last_linenum, last_filename);
+	    (*debug_hooks->source_line) (last_linenum,
+	                                 last_filename,
+	                                 last_discriminator);
 	  }
 
 	if (GET_CODE (body) == ASM_INPUT)
@@ -2687,11 +2698,13 @@ notice_source_line (rtx insn)
   if (filename
       && (force_source_line
 	  || filename != last_filename
-	  || last_linenum != linenum))
+	  || last_linenum != linenum
+	  || last_discriminator != discriminator))
     {
       force_source_line = false;
       last_filename = filename;
       last_linenum = linenum;
+      last_discriminator = discriminator;
       high_block_linenum = MAX (last_linenum, high_block_linenum);
       high_function_linenum = MAX (last_linenum, high_function_linenum);
       return true;
Index: vmsdbgout.c
===================================================================
--- vmsdbgout.c	(revision 146448)
+++ vmsdbgout.c	(working copy)
@@ -173,7 +173,7 @@ static void vmsdbgout_end_source_file (u
 static void vmsdbgout_begin_block (unsigned int, unsigned int);
 static void vmsdbgout_end_block (unsigned int, unsigned int);
 static bool vmsdbgout_ignore_block (const_tree);
-static void vmsdbgout_source_line (unsigned int, const char *);
+static void vmsdbgout_source_line (unsigned int, const char *, int);
 static void vmsdbgout_begin_prologue (unsigned int, const char *);
 static void vmsdbgout_end_prologue (unsigned int, const char *);
 static void vmsdbgout_end_function (unsigned int);
@@ -1297,7 +1297,7 @@ vmsdbgout_end_prologue (unsigned int lin
       ASM_OUTPUT_LABEL (asm_out_file, label);
 
       /* VMS PCA expects every PC range to correlate to some line and file.  */
-      vmsdbgout_source_line (line, file);
+      vmsdbgout_source_line (line, file, 0);
     }
 }
 
@@ -1331,7 +1331,7 @@ vmsdbgout_end_epilogue (unsigned int lin
       ASM_OUTPUT_LABEL (asm_out_file, label);
 
       /* VMS PCA expects every PC range to correlate to some line and file.  */
-      vmsdbgout_source_line (line, file);
+      vmsdbgout_source_line (line, file, 0);
     }
 }
 
@@ -1533,10 +1533,11 @@ lookup_filename (const char *file_name)
    'line_info_table' for later output of the .debug_line section.  */
 
 static void
-vmsdbgout_source_line (register unsigned line, register const char *filename)
+vmsdbgout_source_line (register unsigned line, register const char *filename,
+                       int discriminator)
 {
   if (write_symbols == VMS_AND_DWARF2_DEBUG)
-    (*dwarf2_debug_hooks.source_line) (line, filename);
+    (*dwarf2_debug_hooks.source_line) (line, filename, discriminator);
 
   if (debug_info_level >= DINFO_LEVEL_TERSE)
     {
Index: debug.c
===================================================================
--- debug.c	(revision 146448)
+++ debug.c	(working copy)
@@ -34,7 +34,7 @@ const struct gcc_debug_hooks do_nothing_
   debug_nothing_int_int,	         /* begin_block */
   debug_nothing_int_int,	         /* end_block */
   debug_true_const_tree,	         /* ignore_block */
-  debug_nothing_int_charstar,	         /* source_line */
+  debug_nothing_int_charstar_int,	 /* source_line */
   debug_nothing_int_charstar,	         /* begin_prologue */
   debug_nothing_int_charstar,	         /* end_prologue */
   debug_nothing_int_charstar,	         /* end_epilogue */
@@ -104,6 +104,13 @@ debug_nothing_int_charstar (unsigned int
 }
 
 void
+debug_nothing_int_charstar_int (unsigned int line ATTRIBUTE_UNUSED,
+			        const char *text ATTRIBUTE_UNUSED,
+			        int discriminator ATTRIBUTE_UNUSED)
+{
+}
+
+void
 debug_nothing_int (unsigned int line ATTRIBUTE_UNUSED)
 {
 }
Index: debug.h
===================================================================
--- debug.h	(revision 146448)
+++ debug.h	(working copy)
@@ -59,8 +59,9 @@ struct gcc_debug_hooks
      though the BLOCK information is messed up.  Defaults to true.  */
   bool (* ignore_block) (const_tree);
 
-  /* Record a source file location at (FILE, LINE).  */
-  void (* source_line) (unsigned int line, const char *file);
+  /* Record a source file location at (FILE, LINE, DISCRIMINATOR).  */
+  void (* source_line) (unsigned int line, const char *file,
+                        int discriminator);
 
   /* Called at start of prologue code.  LINE is the first line in the
      function.  This has been given the same prototype as source_line,
@@ -139,6 +140,7 @@ extern const struct gcc_debug_hooks *deb
 extern void debug_nothing_void (void);
 extern void debug_nothing_charstar (const char *);
 extern void debug_nothing_int_charstar (unsigned int, const char *);
+extern void debug_nothing_int_charstar_int (unsigned int, const char *, int);
 extern void debug_nothing_int (unsigned int);
 extern void debug_nothing_int_int (unsigned int, unsigned int);
 extern void debug_nothing_tree (tree);
Index: dbxout.c
===================================================================
--- dbxout.c	(revision 146448)
+++ dbxout.c	(working copy)
@@ -336,7 +336,7 @@ static void dbxout_handle_pch (unsigned)
 /* The debug hooks structure.  */
 #if defined (DBX_DEBUGGING_INFO)
 
-static void dbxout_source_line (unsigned int, const char *);
+static void dbxout_source_line (unsigned int, const char *, int);
 static void dbxout_begin_prologue (unsigned int, const char *);
 static void dbxout_source_file (const char *);
 static void dbxout_function_end (tree);
@@ -1268,7 +1268,7 @@ dbxout_begin_prologue (unsigned int line
   /* pre-increment the scope counter */
   scope_labelno++;
 
-  dbxout_source_line (lineno, filename);
+  dbxout_source_line (lineno, filename, 0);
   /* Output function begin block at function scope, referenced 
      by dbxout_block, dbxout_source_line and dbxout_function_end.  */
   emit_pending_bincls_if_required ();
@@ -1279,7 +1279,8 @@ dbxout_begin_prologue (unsigned int line
    number LINENO.  */
 
 static void
-dbxout_source_line (unsigned int lineno, const char *filename)
+dbxout_source_line (unsigned int lineno, const char *filename,
+                    int discriminator ATTRIBUTE_UNUSED)
 {
   dbxout_source_file (filename);
 
Index: xcoffout.c
===================================================================
--- xcoffout.c	(revision 146448)
+++ xcoffout.c	(working copy)
@@ -321,7 +321,8 @@ xcoffout_source_file (FILE *file, const 
 /* Output a line number symbol entry for location (FILENAME, LINE).  */
 
 void
-xcoffout_source_line (unsigned int line, const char *filename)
+xcoffout_source_line (unsigned int line, const char *filename,
+                      int discriminator ATTRIBUTE_UNUSED)
 {
   bool inline_p = (strcmp (xcoff_current_function_file, filename) != 0
 		   || (int) line < xcoff_begin_function_line);
Index: config.in
===================================================================
--- config.in	(revision 146448)
+++ config.in	(working copy)
@@ -844,6 +844,12 @@
 #endif
 
 
+/* Define if your assembler supports the .loc discriminator sub-directive. */
+#ifndef USED_FOR_TARGET
+#undef HAVE_GAS_DISCRIMINATOR
+#endif
+
+
 /* Define if your assembler uses the new HImode fild and fist notation. */
 #ifndef USED_FOR_TARGET
 #undef HAVE_GAS_FILDS_FISTS
Index: dwarf2out.c
===================================================================
--- dwarf2out.c	(revision 146448)
+++ dwarf2out.c	(working copy)
@@ -91,7 +91,7 @@ along with GCC; see the file COPYING3.  
 #include "input.h"
 
 #ifdef DWARF2_DEBUGGING_INFO
-static void dwarf2out_source_line (unsigned int, const char *);
+static void dwarf2out_source_line (unsigned int, const char *, int);
 #endif
 
 #ifndef DWARF2_FRAME_INFO
@@ -3243,7 +3243,7 @@ dwarf2out_begin_prologue (unsigned int l
      prologue case, not the eh frame case.  */
 #ifdef DWARF2_DEBUGGING_INFO
   if (file)
-    dwarf2out_source_line (line, file);
+    dwarf2out_source_line (line, file, 0);
 #endif
 
   if (dwarf2out_do_cfi_asm ())
@@ -15871,7 +15871,8 @@ dwarf2out_begin_function (tree fun)
    'line_info_table' for later output of the .debug_line section.  */
 
 static void
-dwarf2out_source_line (unsigned int line, const char *filename)
+dwarf2out_source_line (unsigned int line, const char *filename,
+                       int discriminator)
 {
   if (debug_info_level >= DINFO_LEVEL_NORMAL
       && line != 0)
@@ -15888,7 +15889,12 @@ dwarf2out_source_line (unsigned int line
       if (DWARF2_ASM_LINE_DEBUG_INFO)
 	{
 	  /* Emit the .loc directive understood by GNU as.  */
-	  fprintf (asm_out_file, "\t.loc %d %d 0\n", file_num, line);
+	  fprintf (asm_out_file, "\t.loc %d %d 0", file_num, line);
+#ifdef HAVE_GAS_DISCRIMINATOR
+	  if (discriminator != 0)
+	    fprintf (asm_out_file, " discriminator %d", discriminator);
+#endif /* HAVE_GAS_DISCRIMINATOR */
+	  fputc ('\n', asm_out_file);
 
 	  /* Indicate that line number info exists.  */
 	  line_info_table_in_use++;
Index: gimple-pretty-print.c
===================================================================
--- gimple-pretty-print.c	(revision 146448)
+++ gimple-pretty-print.c	(working copy)
@@ -1583,6 +1583,12 @@ dump_bb_header (pretty_printer *buffer, 
 		pp_decimal_int (buffer, get_lineno (gsi_stmt (gsi)));
 		break;
 	      }
+
+          if (bb->discriminator)
+            {
+              pp_string (buffer, ", discriminator ");
+	      pp_decimal_int (buffer, bb->discriminator);
+            }
 	}
       newline_and_indent (buffer, indent);
 
Index: configure.ac
===================================================================
--- configure.ac	(revision 146448)
+++ configure.ac	(working copy)
@@ -2382,6 +2382,15 @@ AC_DEFINE_UNQUOTED(HAVE_COMDAT_GROUP,
   [`if test $gcc_cv_as_comdat_group = yes || test $gcc_cv_as_comdat_group_percent = yes; then echo 1; else echo 0; fi`],
 [Define 0/1 if your assembler and linker support COMDAT groups.])
 
+gcc_GAS_CHECK_FEATURE([line table discriminator support],
+ gcc_cv_as_discriminator,
+ [2,19,51],,
+[	.text
+	.file 1 "conf.c"
+	.loc 1 1 0 discriminator 1],,
+[AC_DEFINE(HAVE_GAS_DISCRIMINATOR, 1,
+  [Define if your assembler supports the .loc discriminator sub-directive.])])
+
 # Thread-local storage - the check is heavily parameterized.
 conftest_s=
 tls_first_major=
Index: sdbout.c
===================================================================
--- sdbout.c	(revision 146448)
+++ sdbout.c	(working copy)
@@ -117,7 +117,7 @@ static void sdbout_start_source_file	(un
 static void sdbout_end_source_file	(unsigned int);
 static void sdbout_begin_block		(unsigned int, unsigned int);
 static void sdbout_end_block		(unsigned int, unsigned int);
-static void sdbout_source_line		(unsigned int, const char *);
+static void sdbout_source_line		(unsigned int, const char *, int);
 static void sdbout_end_epilogue		(unsigned int, const char *);
 static void sdbout_global_decl		(tree);
 #ifndef MIPS_DEBUGGING_INFO
@@ -1541,7 +1541,8 @@ sdbout_end_block (unsigned int line, uns
    number LINE.  */
 
 static void
-sdbout_source_line (unsigned int line, const char *filename ATTRIBUTE_UNUSED)
+sdbout_source_line (unsigned int line, const char *filename ATTRIBUTE_UNUSED,
+                    int discriminator ATTRIBUTE_UNUSED)
 {
   /* COFF relative line numbers must be positive.  */
   if ((int) line > sdb_begin_function_line)
Index: basic-block.h
===================================================================
--- basic-block.h	(revision 146448)
+++ basic-block.h	(working copy)
@@ -253,6 +253,9 @@ struct basic_block_def GTY((chain_next (
   /* Expected frequency.  Normalized to be in range 0 to BB_FREQ_MAX.  */
   int frequency;
 
+  /* The discriminator for this block.  */
+  int discriminator;
+
   /* Various flags.  See BB_* below.  */
   int flags;
 };
Index: tree-cfg.c
===================================================================
--- tree-cfg.c	(revision 146448)
+++ tree-cfg.c	(working copy)
@@ -82,6 +82,14 @@ static struct cfg_stats_d cfg_stats;
 /* Nonzero if we found a computed goto while building basic blocks.  */
 static bool found_computed_goto;
 
+/* Hash table to store last discriminator assigned for each locus.  */
+struct locus_discrim_map
+{
+  location_t locus;
+  int discriminator;
+};
+static htab_t discriminator_per_locus;
+
 /* Basic blocks and flowgraphs.  */
 static void make_blocks (gimple_seq);
 static void factor_computed_gotos (void);
@@ -91,6 +99,9 @@ static void make_edges (void);
 static void make_cond_expr_edges (basic_block);
 static void make_gimple_switch_edges (basic_block);
 static void make_goto_expr_edges (basic_block);
+static unsigned int locus_map_hash (const void*);
+static int locus_map_eq (const void*, const void*);
+static void assign_discriminator (location_t, basic_block);
 static edge gimple_redirect_edge_and_branch (edge, basic_block);
 static edge gimple_try_redirect_by_replacing_jump (edge, basic_block);
 static unsigned int split_critical_edges (void);
@@ -100,6 +111,7 @@ static inline bool stmt_starts_bb_p (gim
 static int gimple_verify_flow_info (void);
 static void gimple_make_forwarder_block (edge);
 static void gimple_cfg2vcg (FILE *);
+static gimple first_non_label_stmt (basic_block);
 
 /* Flowgraph optimization and cleanup.  */
 static void gimple_merge_blocks (basic_block, basic_block);
@@ -193,8 +205,11 @@ build_gimple_cfg (gimple_seq seq)
   group_case_labels ();
 
   /* Create the edges of the flowgraph.  */
+  discriminator_per_locus = htab_create (13, locus_map_hash, locus_map_eq,
+                                         free);
   make_edges ();
   cleanup_dead_labels ();
+  htab_delete (discriminator_per_locus);
 
   /* Debugging dumps.  */
 
@@ -650,7 +665,11 @@ make_edges (void)
 	fallthru = true;
 
       if (fallthru)
-	make_edge (bb, bb->next_bb, EDGE_FALLTHRU);
+        {
+	  make_edge (bb, bb->next_bb, EDGE_FALLTHRU);
+	  if (last)
+            assign_discriminator (gimple_location (last), bb->next_bb);
+	}
     }
 
   if (root_omp_region)
@@ -660,6 +679,82 @@ make_edges (void)
   fold_cond_expr_cond ();
 }
 
+/* Trivial hash function for a location_t.  */
+
+static unsigned int
+locus_map_hash (const void* item)
+{
+  return ((const struct locus_discrim_map*) item)->locus;
+}
+
+/* Equality function for the locus-to-discriminator map.  */
+
+static int
+locus_map_eq (const void* va, const void* vb)
+{
+  const struct locus_discrim_map* a = (const struct locus_discrim_map*) va;
+  const struct locus_discrim_map* b = (const struct locus_discrim_map*) vb;
+  return a->locus == b->locus;
+}
+
+/* Find the next available discriminator value for LOCUS.  The
+   discriminator distinguishes among several basic blocks that
+   share a common locus, allowing for more accurate sample-based
+   profiling.  */
+
+static int
+next_discriminator_for_locus (location_t locus)
+{
+  struct locus_discrim_map item;
+  struct locus_discrim_map** slot;
+
+  item.locus = locus;
+  item.discriminator = 0;
+  slot = (struct locus_discrim_map**)
+      htab_find_slot_with_hash (discriminator_per_locus, (void *) &item,
+                                (hashval_t) locus, INSERT);
+  gcc_assert (slot);
+  if (*slot == HTAB_EMPTY_ENTRY)
+    {
+      *slot = XNEW (struct locus_discrim_map);
+      gcc_assert (*slot);
+      (*slot)->locus = locus;
+      (*slot)->discriminator = 0;
+    }
+  (*slot)->discriminator++;
+  return (*slot)->discriminator;
+}
+
+/* Return TRUE if LOCUS1 and LOCUS2 refer to the same source line.  */
+
+static bool
+same_line_p (location_t locus1, location_t locus2)
+{
+  expanded_location from, to;
+
+  if (locus1 == locus2)
+    return true;
+
+  from = expand_location (locus1);
+  to = expand_location (locus2);
+  return (from.file == to.file && from.line == to.line);
+}
+
+/* Assign a unique discriminator value to block BB if it begins at the same
+   LOCUS as its predecessor block.  */
+
+static void
+assign_discriminator (location_t locus, basic_block bb)
+{
+  gimple to_stmt;
+
+  if (locus == 0 || bb->discriminator != 0)
+    return;
+
+  to_stmt = first_non_label_stmt (bb);
+  if (to_stmt && same_line_p (locus, gimple_location (to_stmt)))
+    bb->discriminator = next_discriminator_for_locus (locus);
+}
 
 /* Create the edges for a GIMPLE_COND starting at block BB.  */
 
@@ -671,10 +766,13 @@ make_cond_expr_edges (basic_block bb)
   basic_block then_bb, else_bb;
   tree then_label, else_label;
   edge e;
+  location_t entry_locus;
 
   gcc_assert (entry);
   gcc_assert (gimple_code (entry) == GIMPLE_COND);
 
+  entry_locus = gimple_location (entry);
+
   /* Entry basic blocks for each component.  */
   then_label = gimple_cond_true_label (entry);
   else_label = gimple_cond_false_label (entry);
@@ -684,12 +782,14 @@ make_cond_expr_edges (basic_block bb)
   else_stmt = first_stmt (else_bb);
 
   e = make_edge (bb, then_bb, EDGE_TRUE_VALUE);
+  assign_discriminator (entry_locus, then_bb);
   e->goto_locus = gimple_location (then_stmt);
   if (e->goto_locus)
     e->goto_block = gimple_block (then_stmt);
   e = make_edge (bb, else_bb, EDGE_FALSE_VALUE);
   if (e)
     {
+      assign_discriminator (entry_locus, else_bb);
       e->goto_locus = gimple_location (else_stmt);
       if (e->goto_locus)
 	e->goto_block = gimple_block (else_stmt);
@@ -799,8 +899,11 @@ static void
 make_gimple_switch_edges (basic_block bb)
 {
   gimple entry = last_stmt (bb);
+  location_t entry_locus;
   size_t i, n;
 
+  entry_locus = gimple_location (entry);
+
   n = gimple_switch_num_labels (entry);
 
   for (i = 0; i < n; ++i)
@@ -808,6 +911,7 @@ make_gimple_switch_edges (basic_block bb
       tree lab = CASE_LABEL (gimple_switch_label (entry, i));
       basic_block label_bb = label_to_block (lab);
       make_edge (bb, label_bb, 0);
+      assign_discriminator (entry_locus, label_bb);
     }
 }
 
@@ -880,8 +984,10 @@ make_goto_expr_edges (basic_block bb)
   if (simple_goto_p (goto_t))
     {
       tree dest = gimple_goto_dest (goto_t);
-      edge e = make_edge (bb, label_to_block (dest), EDGE_FALLTHRU);
+      basic_block label_bb = label_to_block (dest);
+      edge e = make_edge (bb, label_bb, EDGE_FALLTHRU);
       e->goto_locus = gimple_location (goto_t);
+      assign_discriminator (e->goto_locus, label_bb);
       if (e->goto_locus)
 	e->goto_block = gimple_block (goto_t);
       gsi_remove (&last, true);
@@ -2701,6 +2807,17 @@ first_stmt (basic_block bb)
   return !gsi_end_p (i) ? gsi_stmt (i) : NULL;
 }
 
+/* Return the first non-label statement in basic block BB.  */
+
+static gimple
+first_non_label_stmt (basic_block bb)
+{
+  gimple_stmt_iterator i = gsi_start_bb (bb);
+  while (!gsi_end_p (i) && gimple_code (gsi_stmt (i)) == GIMPLE_LABEL)
+    gsi_next (&i);
+  return !gsi_end_p (i) ? gsi_stmt (i) : NULL;
+}
+
 /* Return the last statement in basic block BB.  */
 
 gimple

^ permalink raw reply	[flat|nested] 15+ messages in thread

* Re: [patch] Add discriminators to DWARF line table
  2009-04-23  0:39     ` Cary Coutant
@ 2009-04-30  0:54       ` Cary Coutant
  2009-06-02 20:38         ` Diego Novillo
  0 siblings, 1 reply; 15+ messages in thread
From: Cary Coutant @ 2009-04-30  0:54 UTC (permalink / raw)
  To: gcc-patches

[-- Attachment #1: Type: text/plain, Size: 2147 bytes --]

Ping.

I'm reattaching the patch, this time without the diffs for the
generated files configure and config.in. (Sorry for forgetting to omit
those last time.)

-cary


>        * basic-block.h (struct basic_block_def): Add discriminator field.
>        * dbxout.c (dbxout_source_line): Add new parameter.  Change all
>        callers.
>        * debug.c (do_nothing_debug_hooks): Add additional entry.
>        (debug_nothing_int_charstar_int): New function.
>        * debug.h (struct gcc_debug_hooks): Add parameter to source_line
>        hook.
>        (debug_nothing_int_charstar_int): New declaration.
>        * dwarf2out.c (dwarf2out_source_line): Add new parameter.  Write
>        discriminator value in .loc directive.
>        * final.c (last_discriminator): New variable.
>        (discriminator): New variable.
>        (final_start_function): Initialize above variables, pass current
>        discriminator to debug hook.
>        (notice_source_line): Check for discriminator change.
>        * gimple-pretty-print.c (dump_bb_header): Print discriminator value.
>        * sdbout.c (sdbout_source_line): New parameter.
>        * tree-cfg.c (struct locus_discrim_map): New structure type.
>        (discriminator_per_locus): New hash table.
>        (build_gimple_cfg): Allocate and free discriminator hash table.
>        (make_edges): Call assign_discriminator.
>        (locus_map_hash): New function.
>        (locus_map_eq): New function.
>        (next_discriminator_for_locus): New function.
>        (same_line_p): New function.
>        (assign_discriminator): New function.
>        (make_cond_expr_edges): Call assign_discriminator.
>        (make_gimple_switch_edges): Likewise.
>        (first_non_label_stmt): New function.
>        * vmsdbgout.c (vmsdbgout_source_line): Add new parameter.  Change
>        all callers.
>        * xcoffout.c (xcoffout_source_line): Add new parameter.
>
>        * configure.ac (gcc_cv_as_discriminator): New configury check for
>        gas support for discriminator.
>        * configure: Regenerate.
>        * config.in: Regenerate.

[-- Attachment #2: gcc-discrim-patch-2.txt --]
[-- Type: text/plain, Size: 19356 bytes --]

Index: final.c
===================================================================
--- final.c	(revision 146448)
+++ final.c	(working copy)
@@ -130,6 +130,12 @@ rtx current_output_insn;
 /* Line number of last NOTE.  */
 static int last_linenum;
 
+/* Last discriminator written to assembly.  */
+static int last_discriminator;
+
+/* Discriminator of current block.  */
+static int discriminator;
+
 /* Highest line number in current block.  */
 static int high_block_linenum;
 
@@ -1486,6 +1492,7 @@ final_start_function (rtx first ATTRIBUT
 
   last_filename = locator_file (prologue_locator);
   last_linenum = locator_line (prologue_locator);
+  last_discriminator = discriminator = 0;
 
   high_block_linenum = high_function_linenum = last_linenum;
 
@@ -1842,6 +1849,8 @@ final_scan_insn (rtx insn, FILE *file, i
 	  else
 	    *seen |= SEEN_BB;
 
+          discriminator = NOTE_BASIC_BLOCK (insn)->discriminator;
+
 	  break;
 
 	case NOTE_INSN_EH_REGION_BEG:
@@ -2170,7 +2179,9 @@ final_scan_insn (rtx insn, FILE *file, i
 	   note in a row.  */
 	if (notice_source_line (insn))
 	  {
-	    (*debug_hooks->source_line) (last_linenum, last_filename);
+	    (*debug_hooks->source_line) (last_linenum,
+	                                 last_filename,
+	                                 last_discriminator);
 	  }
 
 	if (GET_CODE (body) == ASM_INPUT)
@@ -2687,11 +2698,13 @@ notice_source_line (rtx insn)
   if (filename
       && (force_source_line
 	  || filename != last_filename
-	  || last_linenum != linenum))
+	  || last_linenum != linenum
+	  || last_discriminator != discriminator))
     {
       force_source_line = false;
       last_filename = filename;
       last_linenum = linenum;
+      last_discriminator = discriminator;
       high_block_linenum = MAX (last_linenum, high_block_linenum);
       high_function_linenum = MAX (last_linenum, high_function_linenum);
       return true;
Index: vmsdbgout.c
===================================================================
--- vmsdbgout.c	(revision 146448)
+++ vmsdbgout.c	(working copy)
@@ -173,7 +173,7 @@ static void vmsdbgout_end_source_file (u
 static void vmsdbgout_begin_block (unsigned int, unsigned int);
 static void vmsdbgout_end_block (unsigned int, unsigned int);
 static bool vmsdbgout_ignore_block (const_tree);
-static void vmsdbgout_source_line (unsigned int, const char *);
+static void vmsdbgout_source_line (unsigned int, const char *, int);
 static void vmsdbgout_begin_prologue (unsigned int, const char *);
 static void vmsdbgout_end_prologue (unsigned int, const char *);
 static void vmsdbgout_end_function (unsigned int);
@@ -1297,7 +1297,7 @@ vmsdbgout_end_prologue (unsigned int lin
       ASM_OUTPUT_LABEL (asm_out_file, label);
 
       /* VMS PCA expects every PC range to correlate to some line and file.  */
-      vmsdbgout_source_line (line, file);
+      vmsdbgout_source_line (line, file, 0);
     }
 }
 
@@ -1331,7 +1331,7 @@ vmsdbgout_end_epilogue (unsigned int lin
       ASM_OUTPUT_LABEL (asm_out_file, label);
 
       /* VMS PCA expects every PC range to correlate to some line and file.  */
-      vmsdbgout_source_line (line, file);
+      vmsdbgout_source_line (line, file, 0);
     }
 }
 
@@ -1533,10 +1533,11 @@ lookup_filename (const char *file_name)
    'line_info_table' for later output of the .debug_line section.  */
 
 static void
-vmsdbgout_source_line (register unsigned line, register const char *filename)
+vmsdbgout_source_line (register unsigned line, register const char *filename,
+                       int discriminator)
 {
   if (write_symbols == VMS_AND_DWARF2_DEBUG)
-    (*dwarf2_debug_hooks.source_line) (line, filename);
+    (*dwarf2_debug_hooks.source_line) (line, filename, discriminator);
 
   if (debug_info_level >= DINFO_LEVEL_TERSE)
     {
Index: debug.c
===================================================================
--- debug.c	(revision 146448)
+++ debug.c	(working copy)
@@ -34,7 +34,7 @@ const struct gcc_debug_hooks do_nothing_
   debug_nothing_int_int,	         /* begin_block */
   debug_nothing_int_int,	         /* end_block */
   debug_true_const_tree,	         /* ignore_block */
-  debug_nothing_int_charstar,	         /* source_line */
+  debug_nothing_int_charstar_int,	 /* source_line */
   debug_nothing_int_charstar,	         /* begin_prologue */
   debug_nothing_int_charstar,	         /* end_prologue */
   debug_nothing_int_charstar,	         /* end_epilogue */
@@ -104,6 +104,13 @@ debug_nothing_int_charstar (unsigned int
 }
 
 void
+debug_nothing_int_charstar_int (unsigned int line ATTRIBUTE_UNUSED,
+			        const char *text ATTRIBUTE_UNUSED,
+			        int discriminator ATTRIBUTE_UNUSED)
+{
+}
+
+void
 debug_nothing_int (unsigned int line ATTRIBUTE_UNUSED)
 {
 }
Index: debug.h
===================================================================
--- debug.h	(revision 146448)
+++ debug.h	(working copy)
@@ -59,8 +59,9 @@ struct gcc_debug_hooks
      though the BLOCK information is messed up.  Defaults to true.  */
   bool (* ignore_block) (const_tree);
 
-  /* Record a source file location at (FILE, LINE).  */
-  void (* source_line) (unsigned int line, const char *file);
+  /* Record a source file location at (FILE, LINE, DISCRIMINATOR).  */
+  void (* source_line) (unsigned int line, const char *file,
+                        int discriminator);
 
   /* Called at start of prologue code.  LINE is the first line in the
      function.  This has been given the same prototype as source_line,
@@ -139,6 +140,7 @@ extern const struct gcc_debug_hooks *deb
 extern void debug_nothing_void (void);
 extern void debug_nothing_charstar (const char *);
 extern void debug_nothing_int_charstar (unsigned int, const char *);
+extern void debug_nothing_int_charstar_int (unsigned int, const char *, int);
 extern void debug_nothing_int (unsigned int);
 extern void debug_nothing_int_int (unsigned int, unsigned int);
 extern void debug_nothing_tree (tree);
Index: dbxout.c
===================================================================
--- dbxout.c	(revision 146448)
+++ dbxout.c	(working copy)
@@ -336,7 +336,7 @@ static void dbxout_handle_pch (unsigned)
 /* The debug hooks structure.  */
 #if defined (DBX_DEBUGGING_INFO)
 
-static void dbxout_source_line (unsigned int, const char *);
+static void dbxout_source_line (unsigned int, const char *, int);
 static void dbxout_begin_prologue (unsigned int, const char *);
 static void dbxout_source_file (const char *);
 static void dbxout_function_end (tree);
@@ -1268,7 +1268,7 @@ dbxout_begin_prologue (unsigned int line
   /* pre-increment the scope counter */
   scope_labelno++;
 
-  dbxout_source_line (lineno, filename);
+  dbxout_source_line (lineno, filename, 0);
   /* Output function begin block at function scope, referenced 
      by dbxout_block, dbxout_source_line and dbxout_function_end.  */
   emit_pending_bincls_if_required ();
@@ -1279,7 +1279,8 @@ dbxout_begin_prologue (unsigned int line
    number LINENO.  */
 
 static void
-dbxout_source_line (unsigned int lineno, const char *filename)
+dbxout_source_line (unsigned int lineno, const char *filename,
+                    int discriminator ATTRIBUTE_UNUSED)
 {
   dbxout_source_file (filename);
 
Index: xcoffout.c
===================================================================
--- xcoffout.c	(revision 146448)
+++ xcoffout.c	(working copy)
@@ -321,7 +321,8 @@ xcoffout_source_file (FILE *file, const 
 /* Output a line number symbol entry for location (FILENAME, LINE).  */
 
 void
-xcoffout_source_line (unsigned int line, const char *filename)
+xcoffout_source_line (unsigned int line, const char *filename,
+                      int discriminator ATTRIBUTE_UNUSED)
 {
   bool inline_p = (strcmp (xcoff_current_function_file, filename) != 0
 		   || (int) line < xcoff_begin_function_line);
Index: dwarf2out.c
===================================================================
--- dwarf2out.c	(revision 146448)
+++ dwarf2out.c	(working copy)
@@ -91,7 +91,7 @@ along with GCC; see the file COPYING3.  
 #include "input.h"
 
 #ifdef DWARF2_DEBUGGING_INFO
-static void dwarf2out_source_line (unsigned int, const char *);
+static void dwarf2out_source_line (unsigned int, const char *, int);
 #endif
 
 #ifndef DWARF2_FRAME_INFO
@@ -3243,7 +3243,7 @@ dwarf2out_begin_prologue (unsigned int l
      prologue case, not the eh frame case.  */
 #ifdef DWARF2_DEBUGGING_INFO
   if (file)
-    dwarf2out_source_line (line, file);
+    dwarf2out_source_line (line, file, 0);
 #endif
 
   if (dwarf2out_do_cfi_asm ())
@@ -15871,7 +15871,8 @@ dwarf2out_begin_function (tree fun)
    'line_info_table' for later output of the .debug_line section.  */
 
 static void
-dwarf2out_source_line (unsigned int line, const char *filename)
+dwarf2out_source_line (unsigned int line, const char *filename,
+                       int discriminator)
 {
   if (debug_info_level >= DINFO_LEVEL_NORMAL
       && line != 0)
@@ -15888,7 +15889,12 @@ dwarf2out_source_line (unsigned int line
       if (DWARF2_ASM_LINE_DEBUG_INFO)
 	{
 	  /* Emit the .loc directive understood by GNU as.  */
-	  fprintf (asm_out_file, "\t.loc %d %d 0\n", file_num, line);
+	  fprintf (asm_out_file, "\t.loc %d %d 0", file_num, line);
+#ifdef HAVE_GAS_DISCRIMINATOR
+	  if (discriminator != 0)
+	    fprintf (asm_out_file, " discriminator %d", discriminator);
+#endif /* HAVE_GAS_DISCRIMINATOR */
+	  fputc ('\n', asm_out_file);
 
 	  /* Indicate that line number info exists.  */
 	  line_info_table_in_use++;
Index: gimple-pretty-print.c
===================================================================
--- gimple-pretty-print.c	(revision 146448)
+++ gimple-pretty-print.c	(working copy)
@@ -1583,6 +1583,12 @@ dump_bb_header (pretty_printer *buffer, 
 		pp_decimal_int (buffer, get_lineno (gsi_stmt (gsi)));
 		break;
 	      }
+
+          if (bb->discriminator)
+            {
+              pp_string (buffer, ", discriminator ");
+	      pp_decimal_int (buffer, bb->discriminator);
+            }
 	}
       newline_and_indent (buffer, indent);
 
Index: configure.ac
===================================================================
--- configure.ac	(revision 146448)
+++ configure.ac	(working copy)
@@ -2382,6 +2382,15 @@ AC_DEFINE_UNQUOTED(HAVE_COMDAT_GROUP,
   [`if test $gcc_cv_as_comdat_group = yes || test $gcc_cv_as_comdat_group_percent = yes; then echo 1; else echo 0; fi`],
 [Define 0/1 if your assembler and linker support COMDAT groups.])
 
+gcc_GAS_CHECK_FEATURE([line table discriminator support],
+ gcc_cv_as_discriminator,
+ [2,19,51],,
+[	.text
+	.file 1 "conf.c"
+	.loc 1 1 0 discriminator 1],,
+[AC_DEFINE(HAVE_GAS_DISCRIMINATOR, 1,
+  [Define if your assembler supports the .loc discriminator sub-directive.])])
+
 # Thread-local storage - the check is heavily parameterized.
 conftest_s=
 tls_first_major=
Index: sdbout.c
===================================================================
--- sdbout.c	(revision 146448)
+++ sdbout.c	(working copy)
@@ -117,7 +117,7 @@ static void sdbout_start_source_file	(un
 static void sdbout_end_source_file	(unsigned int);
 static void sdbout_begin_block		(unsigned int, unsigned int);
 static void sdbout_end_block		(unsigned int, unsigned int);
-static void sdbout_source_line		(unsigned int, const char *);
+static void sdbout_source_line		(unsigned int, const char *, int);
 static void sdbout_end_epilogue		(unsigned int, const char *);
 static void sdbout_global_decl		(tree);
 #ifndef MIPS_DEBUGGING_INFO
@@ -1541,7 +1541,8 @@ sdbout_end_block (unsigned int line, uns
    number LINE.  */
 
 static void
-sdbout_source_line (unsigned int line, const char *filename ATTRIBUTE_UNUSED)
+sdbout_source_line (unsigned int line, const char *filename ATTRIBUTE_UNUSED,
+                    int discriminator ATTRIBUTE_UNUSED)
 {
   /* COFF relative line numbers must be positive.  */
   if ((int) line > sdb_begin_function_line)
Index: basic-block.h
===================================================================
--- basic-block.h	(revision 146448)
+++ basic-block.h	(working copy)
@@ -253,6 +253,9 @@ struct basic_block_def GTY((chain_next (
   /* Expected frequency.  Normalized to be in range 0 to BB_FREQ_MAX.  */
   int frequency;
 
+  /* The discriminator for this block.  */
+  int discriminator;
+
   /* Various flags.  See BB_* below.  */
   int flags;
 };
Index: tree-cfg.c
===================================================================
--- tree-cfg.c	(revision 146448)
+++ tree-cfg.c	(working copy)
@@ -82,6 +82,14 @@ static struct cfg_stats_d cfg_stats;
 /* Nonzero if we found a computed goto while building basic blocks.  */
 static bool found_computed_goto;
 
+/* Hash table to store last discriminator assigned for each locus.  */
+struct locus_discrim_map
+{
+  location_t locus;
+  int discriminator;
+};
+static htab_t discriminator_per_locus;
+
 /* Basic blocks and flowgraphs.  */
 static void make_blocks (gimple_seq);
 static void factor_computed_gotos (void);
@@ -91,6 +99,9 @@ static void make_edges (void);
 static void make_cond_expr_edges (basic_block);
 static void make_gimple_switch_edges (basic_block);
 static void make_goto_expr_edges (basic_block);
+static unsigned int locus_map_hash (const void*);
+static int locus_map_eq (const void*, const void*);
+static void assign_discriminator (location_t, basic_block);
 static edge gimple_redirect_edge_and_branch (edge, basic_block);
 static edge gimple_try_redirect_by_replacing_jump (edge, basic_block);
 static unsigned int split_critical_edges (void);
@@ -100,6 +111,7 @@ static inline bool stmt_starts_bb_p (gim
 static int gimple_verify_flow_info (void);
 static void gimple_make_forwarder_block (edge);
 static void gimple_cfg2vcg (FILE *);
+static gimple first_non_label_stmt (basic_block);
 
 /* Flowgraph optimization and cleanup.  */
 static void gimple_merge_blocks (basic_block, basic_block);
@@ -193,8 +205,11 @@ build_gimple_cfg (gimple_seq seq)
   group_case_labels ();
 
   /* Create the edges of the flowgraph.  */
+  discriminator_per_locus = htab_create (13, locus_map_hash, locus_map_eq,
+                                         free);
   make_edges ();
   cleanup_dead_labels ();
+  htab_delete (discriminator_per_locus);
 
   /* Debugging dumps.  */
 
@@ -650,7 +665,11 @@ make_edges (void)
 	fallthru = true;
 
       if (fallthru)
-	make_edge (bb, bb->next_bb, EDGE_FALLTHRU);
+        {
+	  make_edge (bb, bb->next_bb, EDGE_FALLTHRU);
+	  if (last)
+            assign_discriminator (gimple_location (last), bb->next_bb);
+	}
     }
 
   if (root_omp_region)
@@ -660,6 +679,82 @@ make_edges (void)
   fold_cond_expr_cond ();
 }
 
+/* Trivial hash function for a location_t.  */
+
+static unsigned int
+locus_map_hash (const void* item)
+{
+  return ((const struct locus_discrim_map*) item)->locus;
+}
+
+/* Equality function for the locus-to-discriminator map.  */
+
+static int
+locus_map_eq (const void* va, const void* vb)
+{
+  const struct locus_discrim_map* a = (const struct locus_discrim_map*) va;
+  const struct locus_discrim_map* b = (const struct locus_discrim_map*) vb;
+  return a->locus == b->locus;
+}
+
+/* Find the next available discriminator value for LOCUS.  The
+   discriminator distinguishes among several basic blocks that
+   share a common locus, allowing for more accurate sample-based
+   profiling.  */
+
+static int
+next_discriminator_for_locus (location_t locus)
+{
+  struct locus_discrim_map item;
+  struct locus_discrim_map** slot;
+
+  item.locus = locus;
+  item.discriminator = 0;
+  slot = (struct locus_discrim_map**)
+      htab_find_slot_with_hash (discriminator_per_locus, (void *) &item,
+                                (hashval_t) locus, INSERT);
+  gcc_assert (slot);
+  if (*slot == HTAB_EMPTY_ENTRY)
+    {
+      *slot = XNEW (struct locus_discrim_map);
+      gcc_assert (*slot);
+      (*slot)->locus = locus;
+      (*slot)->discriminator = 0;
+    }
+  (*slot)->discriminator++;
+  return (*slot)->discriminator;
+}
+
+/* Return TRUE if LOCUS1 and LOCUS2 refer to the same source line.  */
+
+static bool
+same_line_p (location_t locus1, location_t locus2)
+{
+  expanded_location from, to;
+
+  if (locus1 == locus2)
+    return true;
+
+  from = expand_location (locus1);
+  to = expand_location (locus2);
+  return (from.file == to.file && from.line == to.line);
+}
+
+/* Assign a unique discriminator value to block BB if it begins at the same
+   LOCUS as its predecessor block.  */
+
+static void
+assign_discriminator (location_t locus, basic_block bb)
+{
+  gimple to_stmt;
+
+  if (locus == 0 || bb->discriminator != 0)
+    return;
+
+  to_stmt = first_non_label_stmt (bb);
+  if (to_stmt && same_line_p (locus, gimple_location (to_stmt)))
+    bb->discriminator = next_discriminator_for_locus (locus);
+}
 
 /* Create the edges for a GIMPLE_COND starting at block BB.  */
 
@@ -671,10 +766,13 @@ make_cond_expr_edges (basic_block bb)
   basic_block then_bb, else_bb;
   tree then_label, else_label;
   edge e;
+  location_t entry_locus;
 
   gcc_assert (entry);
   gcc_assert (gimple_code (entry) == GIMPLE_COND);
 
+  entry_locus = gimple_location (entry);
+
   /* Entry basic blocks for each component.  */
   then_label = gimple_cond_true_label (entry);
   else_label = gimple_cond_false_label (entry);
@@ -684,12 +782,14 @@ make_cond_expr_edges (basic_block bb)
   else_stmt = first_stmt (else_bb);
 
   e = make_edge (bb, then_bb, EDGE_TRUE_VALUE);
+  assign_discriminator (entry_locus, then_bb);
   e->goto_locus = gimple_location (then_stmt);
   if (e->goto_locus)
     e->goto_block = gimple_block (then_stmt);
   e = make_edge (bb, else_bb, EDGE_FALSE_VALUE);
   if (e)
     {
+      assign_discriminator (entry_locus, else_bb);
       e->goto_locus = gimple_location (else_stmt);
       if (e->goto_locus)
 	e->goto_block = gimple_block (else_stmt);
@@ -799,8 +899,11 @@ static void
 make_gimple_switch_edges (basic_block bb)
 {
   gimple entry = last_stmt (bb);
+  location_t entry_locus;
   size_t i, n;
 
+  entry_locus = gimple_location (entry);
+
   n = gimple_switch_num_labels (entry);
 
   for (i = 0; i < n; ++i)
@@ -808,6 +911,7 @@ make_gimple_switch_edges (basic_block bb
       tree lab = CASE_LABEL (gimple_switch_label (entry, i));
       basic_block label_bb = label_to_block (lab);
       make_edge (bb, label_bb, 0);
+      assign_discriminator (entry_locus, label_bb);
     }
 }
 
@@ -880,8 +984,10 @@ make_goto_expr_edges (basic_block bb)
   if (simple_goto_p (goto_t))
     {
       tree dest = gimple_goto_dest (goto_t);
-      edge e = make_edge (bb, label_to_block (dest), EDGE_FALLTHRU);
+      basic_block label_bb = label_to_block (dest);
+      edge e = make_edge (bb, label_bb, EDGE_FALLTHRU);
       e->goto_locus = gimple_location (goto_t);
+      assign_discriminator (e->goto_locus, label_bb);
       if (e->goto_locus)
 	e->goto_block = gimple_block (goto_t);
       gsi_remove (&last, true);
@@ -2701,6 +2807,17 @@ first_stmt (basic_block bb)
   return !gsi_end_p (i) ? gsi_stmt (i) : NULL;
 }
 
+/* Return the first non-label statement in basic block BB.  */
+
+static gimple
+first_non_label_stmt (basic_block bb)
+{
+  gimple_stmt_iterator i = gsi_start_bb (bb);
+  while (!gsi_end_p (i) && gimple_code (gsi_stmt (i)) == GIMPLE_LABEL)
+    gsi_next (&i);
+  return !gsi_end_p (i) ? gsi_stmt (i) : NULL;
+}
+
 /* Return the last statement in basic block BB.  */
 
 gimple

^ permalink raw reply	[flat|nested] 15+ messages in thread

* Re: [patch] Add discriminators to DWARF line table
  2009-04-30  0:54       ` Cary Coutant
@ 2009-06-02 20:38         ` Diego Novillo
  2009-06-02 21:02           ` Cary Coutant
  0 siblings, 1 reply; 15+ messages in thread
From: Diego Novillo @ 2009-06-02 20:38 UTC (permalink / raw)
  To: Cary Coutant; +Cc: gcc-patches

On Wed, Apr 29, 2009 at 19:20, Cary Coutant <ccoutant@google.com> wrote:

>        * basic-block.h (struct basic_block_def): Add discriminator field.
>        * dbxout.c (dbxout_source_line): Add new parameter.  Change all
>        callers.
>        * debug.c (do_nothing_debug_hooks): Add additional entry.
>        (debug_nothing_int_charstar_int): New function.
>        * debug.h (struct gcc_debug_hooks): Add parameter to source_line
>        hook.
>        (debug_nothing_int_charstar_int): New declaration.
>        * dwarf2out.c (dwarf2out_source_line): Add new parameter.  Write
>        discriminator value in .loc directive.
>        * final.c (last_discriminator): New variable.
>        (discriminator): New variable.
>        (final_start_function): Initialize above variables, pass current
>        discriminator to debug hook.
>        (notice_source_line): Check for discriminator change.
>        * gimple-pretty-print.c (dump_bb_header): Print discriminator value.
>        * sdbout.c (sdbout_source_line): New parameter.
>        * tree-cfg.c (struct locus_discrim_map): New structure type.
>        (discriminator_per_locus): New hash table.
>        (build_gimple_cfg): Allocate and free discriminator hash table.
>        (make_edges): Call assign_discriminator.
>        (locus_map_hash): New function.
>        (locus_map_eq): New function.
>        (next_discriminator_for_locus): New function.
>        (same_line_p): New function.
>        (assign_discriminator): New function.
>        (make_cond_expr_edges): Call assign_discriminator.
>        (make_gimple_switch_edges): Likewise.
>        (first_non_label_stmt): New function.
>        * vmsdbgout.c (vmsdbgout_source_line): Add new parameter.  Change
>        all callers.
>        * xcoffout.c (xcoffout_source_line): Add new parameter.
>
>        * configure.ac (gcc_cv_as_discriminator): New configury check for
>        gas support for discriminator.
>        * configure: Regenerate.
>        * config.in: Regenerate.

OK with:

>  #ifndef DWARF2_FRAME_INFO
> @@ -3243,7 +3243,7 @@ dwarf2out_begin_prologue (unsigned int l
>       prologue case, not the eh frame case.  */
>  #ifdef DWARF2_DEBUGGING_INFO
>    if (file)
> -    dwarf2out_source_line (line, file);
> +    dwarf2out_source_line (line, file, 0);

For a line that uses no discriminators, is 'file:line:0' the same
as 'file:line'?  I expect, yes.  Should we support a
discriminator other than 0 to be the 'no discriminator' setting?
I don't know what the standard says, so this may be a silly
question.

> @@ -91,6 +99,9 @@ static void make_edges (void);
>  static void make_cond_expr_edges (basic_block);
>  static void make_gimple_switch_edges (basic_block);
>  static void make_goto_expr_edges (basic_block);
> +static unsigned int locus_map_hash (const void*);
> +static int locus_map_eq (const void*, const void*);

Space before '*'.

> +/* Trivial hash function for a location_t.  */
> +
> +static unsigned int
> +locus_map_hash (const void* item)

Document ITEM.  Space before '*'.

> +/* Equality function for the locus-to-discriminator map.  */
> +
> +static int
> +locus_map_eq (const void* va, const void* vb)

Document VA and VB.  Space before '*'.

> +{
> +  const struct locus_discrim_map* a = (const struct locus_discrim_map*) va;
> +  const struct locus_discrim_map* b = (const struct locus_discrim_map*) vb;

Likewise.

> +  from = expand_location (locus1);
> +  to = expand_location (locus2);
> +  return (from.file == to.file && from.line == to.line);

Are file name strings canonicalized by the location_t code?  I
assume they are, but I'm not sure.  If not, you may need a better
matching code here.


Diego.

^ permalink raw reply	[flat|nested] 15+ messages in thread

* Re: [patch] Add discriminators to DWARF line table
  2009-06-02 20:38         ` Diego Novillo
@ 2009-06-02 21:02           ` Cary Coutant
  2009-06-03  1:03             ` Cary Coutant
  0 siblings, 1 reply; 15+ messages in thread
From: Cary Coutant @ 2009-06-02 21:02 UTC (permalink / raw)
  To: Diego Novillo; +Cc: gcc-patches

>>  #ifndef DWARF2_FRAME_INFO
>> @@ -3243,7 +3243,7 @@ dwarf2out_begin_prologue (unsigned int l
>>       prologue case, not the eh frame case.  */
>>  #ifdef DWARF2_DEBUGGING_INFO
>>    if (file)
>> -    dwarf2out_source_line (line, file);
>> +    dwarf2out_source_line (line, file, 0);
>
> For a line that uses no discriminators, is 'file:line:0' the same
> as 'file:line'?  I expect, yes.  Should we support a
> discriminator other than 0 to be the 'no discriminator' setting?
> I don't know what the standard says, so this may be a silly
> question.

Yes, the default discriminator is 0; I assign non-zero discriminators
whenever there's more than one basic block for that source position. A
discriminator of 0 will not add any new debug info.

>> @@ -91,6 +99,9 @@ static void make_edges (void);
>>  static void make_cond_expr_edges (basic_block);
>>  static void make_gimple_switch_edges (basic_block);
>>  static void make_goto_expr_edges (basic_block);
>> +static unsigned int locus_map_hash (const void*);
>> +static int locus_map_eq (const void*, const void*);
>
> Space before '*'.

OK.

>> +/* Trivial hash function for a location_t.  */
>> +
>> +static unsigned int
>> +locus_map_hash (const void* item)
>
> Document ITEM.  Space before '*'.

OK.

>> +/* Equality function for the locus-to-discriminator map.  */
>> +
>> +static int
>> +locus_map_eq (const void* va, const void* vb)
>
> Document VA and VB.  Space before '*'.

OK.

>> +{
>> +  const struct locus_discrim_map* a = (const struct locus_discrim_map*) va;
>> +  const struct locus_discrim_map* b = (const struct locus_discrim_map*) vb;
>
> Likewise.

OK.

>> +  from = expand_location (locus1);
>> +  to = expand_location (locus2);
>> +  return (from.file == to.file && from.line == to.line);
>
> Are file name strings canonicalized by the location_t code?  I
> assume they are, but I'm not sure.  If not, you may need a better
> matching code here.

I checked this experimentally, but I'll delve deeper into the code to make sure.

Thanks!

-cary

^ permalink raw reply	[flat|nested] 15+ messages in thread

* Re: [patch] Add discriminators to DWARF line table
  2009-06-02 21:02           ` Cary Coutant
@ 2009-06-03  1:03             ` Cary Coutant
  2009-06-03 11:44               ` Diego Novillo
  2009-06-03 14:26               ` Tom Tromey
  0 siblings, 2 replies; 15+ messages in thread
From: Cary Coutant @ 2009-06-03  1:03 UTC (permalink / raw)
  To: Diego Novillo; +Cc: gcc-patches

[-- Attachment #1: Type: text/plain, Size: 2555 bytes --]

>>> +  from = expand_location (locus1);
>>> +  to = expand_location (locus2);
>>> +  return (from.file == to.file && from.line == to.line);
>>
>> Are file name strings canonicalized by the location_t code?  I
>> assume they are, but I'm not sure.  If not, you may need a better
>> matching code here.
>
> I checked this experimentally, but I'll delve deeper into the code to make sure.

It looks like the string pointers may not be the same if there's an
intervening #line directive. I've changed this to do a quick pointer
comparison, then fall back to a strcmp:

  if (from.line != to.line)
    return false;
  if (from.file == to.file)
    return true;
  return strcmp (from.file, to.file);

New patch is attached.  I've done an overdue svn update on my working
copy, so I'll bootstrap and test again. Assuming that works, is this
OK?

-cary


	* basic-block.h (struct basic_block_def): Add discriminator field.
	* dbxout.c (dbxout_source_line): Add new parameter.  Change all
	callers.
	* debug.c (do_nothing_debug_hooks): Add additional entry.
	(debug_nothing_int_charstar_int): New function.
	* debug.h (struct gcc_debug_hooks): Add parameter to source_line
	hook.
	(debug_nothing_int_charstar_int): New declaration.
	* dwarf2out.c (dwarf2out_source_line): Add new parameter.  Write
	discriminator value in .loc directive.
	* final.c (last_discriminator): New variable.
	(discriminator): New variable.
	(final_start_function): Initialize above variables, pass current
	discriminator to debug hook.
	(notice_source_line): Check for discriminator change.
	* gimple-pretty-print.c (dump_bb_header): Print discriminator value.
	* sdbout.c (sdbout_source_line): New parameter.
	* tree-cfg.c (struct locus_discrim_map): New structure type.
	(discriminator_per_locus): New hash table.
	(build_gimple_cfg): Allocate and free discriminator hash table.
	(make_edges): Call assign_discriminator.
	(locus_map_hash): New function.
	(locus_map_eq): New function.
	(next_discriminator_for_locus): New function.
	(same_line_p): New function.
	(assign_discriminator): New function.
	(make_cond_expr_edges): Call assign_discriminator.
	(make_gimple_switch_edges): Likewise.
	(first_non_label_stmt): New function.
	* vmsdbgout.c (vmsdbgout_source_line): Add new parameter.  Change
	all callers.
	* xcoffout.c (xcoffout_source_line): Add new parameter.

	* configure.ac (gcc_cv_as_discriminator): New configury check for
	gas support for discriminator.
	* configure: Regenerate.
	* config.in: Regenerate.

[-- Attachment #2: gcc-discrim-patch-3.txt --]
[-- Type: text/plain, Size: 19592 bytes --]

Index: basic-block.h
===================================================================
--- basic-block.h	(revision 148110)
+++ basic-block.h	(working copy)
@@ -249,6 +249,9 @@ struct GTY((chain_next ("%h.next_bb"), c
   /* Expected frequency.  Normalized to be in range 0 to BB_FREQ_MAX.  */
   int frequency;
 
+  /* The discriminator for this block.  */
+  int discriminator;
+
   /* Various flags.  See BB_* below.  */
   int flags;
 };
Index: configure.ac
===================================================================
--- configure.ac	(revision 148110)
+++ configure.ac	(working copy)
@@ -2408,6 +2408,15 @@ AC_DEFINE_UNQUOTED(HAVE_COMDAT_GROUP,
   [`if test $gcc_cv_as_comdat_group = yes || test $gcc_cv_as_comdat_group_percent = yes; then echo 1; else echo 0; fi`],
 [Define 0/1 if your assembler and linker support COMDAT groups.])
 
+gcc_GAS_CHECK_FEATURE([line table discriminator support],
+ gcc_cv_as_discriminator,
+ [2,19,51],,
+[	.text
+	.file 1 "conf.c"
+	.loc 1 1 0 discriminator 1],,
+[AC_DEFINE(HAVE_GAS_DISCRIMINATOR, 1,
+  [Define if your assembler supports the .loc discriminator sub-directive.])])
+
 # Thread-local storage - the check is heavily parameterized.
 conftest_s=
 tls_first_major=
Index: dbxout.c
===================================================================
--- dbxout.c	(revision 148110)
+++ dbxout.c	(working copy)
@@ -333,7 +333,7 @@ static void dbxout_handle_pch (unsigned)
 /* The debug hooks structure.  */
 #if defined (DBX_DEBUGGING_INFO)
 
-static void dbxout_source_line (unsigned int, const char *);
+static void dbxout_source_line (unsigned int, const char *, int);
 static void dbxout_begin_prologue (unsigned int, const char *);
 static void dbxout_source_file (const char *);
 static void dbxout_function_end (tree);
@@ -1265,7 +1265,7 @@ dbxout_begin_prologue (unsigned int line
   /* pre-increment the scope counter */
   scope_labelno++;
 
-  dbxout_source_line (lineno, filename);
+  dbxout_source_line (lineno, filename, 0);
   /* Output function begin block at function scope, referenced 
      by dbxout_block, dbxout_source_line and dbxout_function_end.  */
   emit_pending_bincls_if_required ();
@@ -1276,7 +1276,8 @@ dbxout_begin_prologue (unsigned int line
    number LINENO.  */
 
 static void
-dbxout_source_line (unsigned int lineno, const char *filename)
+dbxout_source_line (unsigned int lineno, const char *filename,
+                    int discriminator ATTRIBUTE_UNUSED)
 {
   dbxout_source_file (filename);
 
Index: debug.c
===================================================================
--- debug.c	(revision 148110)
+++ debug.c	(working copy)
@@ -34,7 +34,7 @@ const struct gcc_debug_hooks do_nothing_
   debug_nothing_int_int,	         /* begin_block */
   debug_nothing_int_int,	         /* end_block */
   debug_true_const_tree,	         /* ignore_block */
-  debug_nothing_int_charstar,	         /* source_line */
+  debug_nothing_int_charstar_int,	 /* source_line */
   debug_nothing_int_charstar,	         /* begin_prologue */
   debug_nothing_int_charstar,	         /* end_prologue */
   debug_nothing_int_charstar,	         /* end_epilogue */
@@ -104,6 +104,13 @@ debug_nothing_int_charstar (unsigned int
 }
 
 void
+debug_nothing_int_charstar_int (unsigned int line ATTRIBUTE_UNUSED,
+			        const char *text ATTRIBUTE_UNUSED,
+			        int discriminator ATTRIBUTE_UNUSED)
+{
+}
+
+void
 debug_nothing_int (unsigned int line ATTRIBUTE_UNUSED)
 {
 }
Index: debug.h
===================================================================
--- debug.h	(revision 148110)
+++ debug.h	(working copy)
@@ -59,8 +59,9 @@ struct gcc_debug_hooks
      though the BLOCK information is messed up.  Defaults to true.  */
   bool (* ignore_block) (const_tree);
 
-  /* Record a source file location at (FILE, LINE).  */
-  void (* source_line) (unsigned int line, const char *file);
+  /* Record a source file location at (FILE, LINE, DISCRIMINATOR).  */
+  void (* source_line) (unsigned int line, const char *file,
+                        int discriminator);
 
   /* Called at start of prologue code.  LINE is the first line in the
      function.  This has been given the same prototype as source_line,
@@ -141,6 +142,7 @@ extern const struct gcc_debug_hooks *deb
 extern void debug_nothing_void (void);
 extern void debug_nothing_charstar (const char *);
 extern void debug_nothing_int_charstar (unsigned int, const char *);
+extern void debug_nothing_int_charstar_int (unsigned int, const char *, int);
 extern void debug_nothing_int (unsigned int);
 extern void debug_nothing_int_int (unsigned int, unsigned int);
 extern void debug_nothing_tree (tree);
Index: dwarf2out.c
===================================================================
--- dwarf2out.c	(revision 148110)
+++ dwarf2out.c	(working copy)
@@ -91,7 +91,7 @@ along with GCC; see the file COPYING3.  
 #include "input.h"
 
 #ifdef DWARF2_DEBUGGING_INFO
-static void dwarf2out_source_line (unsigned int, const char *);
+static void dwarf2out_source_line (unsigned int, const char *, int);
 #endif
 
 #ifndef DWARF2_FRAME_INFO
@@ -3608,7 +3608,7 @@ dwarf2out_begin_prologue (unsigned int l
      prologue case, not the eh frame case.  */
 #ifdef DWARF2_DEBUGGING_INFO
   if (file)
-    dwarf2out_source_line (line, file);
+    dwarf2out_source_line (line, file, 0);
 #endif
 
   if (dwarf2out_do_cfi_asm ())
@@ -16207,7 +16207,8 @@ dwarf2out_begin_function (tree fun)
    'line_info_table' for later output of the .debug_line section.  */
 
 static void
-dwarf2out_source_line (unsigned int line, const char *filename)
+dwarf2out_source_line (unsigned int line, const char *filename,
+                       int discriminator)
 {
   if (debug_info_level >= DINFO_LEVEL_NORMAL
       && line != 0)
@@ -16224,7 +16225,12 @@ dwarf2out_source_line (unsigned int line
       if (DWARF2_ASM_LINE_DEBUG_INFO)
 	{
 	  /* Emit the .loc directive understood by GNU as.  */
-	  fprintf (asm_out_file, "\t.loc %d %d 0\n", file_num, line);
+	  fprintf (asm_out_file, "\t.loc %d %d 0", file_num, line);
+#ifdef HAVE_GAS_DISCRIMINATOR
+	  if (discriminator != 0)
+	    fprintf (asm_out_file, " discriminator %d", discriminator);
+#endif /* HAVE_GAS_DISCRIMINATOR */
+	  fputc ('\n', asm_out_file);
 
 	  /* Indicate that line number info exists.  */
 	  line_info_table_in_use++;
Index: final.c
===================================================================
--- final.c	(revision 148110)
+++ final.c	(working copy)
@@ -130,6 +130,12 @@ rtx current_output_insn;
 /* Line number of last NOTE.  */
 static int last_linenum;
 
+/* Last discriminator written to assembly.  */
+static int last_discriminator;
+
+/* Discriminator of current block.  */
+static int discriminator;
+
 /* Highest line number in current block.  */
 static int high_block_linenum;
 
@@ -1496,6 +1502,7 @@ final_start_function (rtx first ATTRIBUT
 
   last_filename = locator_file (prologue_locator);
   last_linenum = locator_line (prologue_locator);
+  last_discriminator = discriminator = 0;
 
   high_block_linenum = high_function_linenum = last_linenum;
 
@@ -1852,6 +1859,8 @@ final_scan_insn (rtx insn, FILE *file, i
 	  else
 	    *seen |= SEEN_BB;
 
+          discriminator = NOTE_BASIC_BLOCK (insn)->discriminator;
+
 	  break;
 
 	case NOTE_INSN_EH_REGION_BEG:
@@ -2183,7 +2192,9 @@ final_scan_insn (rtx insn, FILE *file, i
 	   note in a row.  */
 	if (notice_source_line (insn))
 	  {
-	    (*debug_hooks->source_line) (last_linenum, last_filename);
+	    (*debug_hooks->source_line) (last_linenum,
+	                                 last_filename,
+	                                 last_discriminator);
 	  }
 
 	if (GET_CODE (body) == ASM_INPUT)
@@ -2709,11 +2720,13 @@ notice_source_line (rtx insn)
   if (filename
       && (force_source_line
 	  || filename != last_filename
-	  || last_linenum != linenum))
+	  || last_linenum != linenum
+	  || last_discriminator != discriminator))
     {
       force_source_line = false;
       last_filename = filename;
       last_linenum = linenum;
+      last_discriminator = discriminator;
       high_block_linenum = MAX (last_linenum, high_block_linenum);
       high_function_linenum = MAX (last_linenum, high_function_linenum);
       return true;
Index: gimple-pretty-print.c
===================================================================
--- gimple-pretty-print.c	(revision 148110)
+++ gimple-pretty-print.c	(working copy)
@@ -1558,6 +1558,12 @@ dump_bb_header (pretty_printer *buffer, 
 		pp_decimal_int (buffer, get_lineno (gsi_stmt (gsi)));
 		break;
 	      }
+
+          if (bb->discriminator)
+            {
+              pp_string (buffer, ", discriminator ");
+	      pp_decimal_int (buffer, bb->discriminator);
+            }
 	}
       newline_and_indent (buffer, indent);
 
Index: sdbout.c
===================================================================
--- sdbout.c	(revision 148110)
+++ sdbout.c	(working copy)
@@ -117,7 +117,7 @@ static void sdbout_start_source_file	(un
 static void sdbout_end_source_file	(unsigned int);
 static void sdbout_begin_block		(unsigned int, unsigned int);
 static void sdbout_end_block		(unsigned int, unsigned int);
-static void sdbout_source_line		(unsigned int, const char *);
+static void sdbout_source_line		(unsigned int, const char *, int);
 static void sdbout_end_epilogue		(unsigned int, const char *);
 static void sdbout_global_decl		(tree);
 #ifndef MIPS_DEBUGGING_INFO
@@ -1541,7 +1541,8 @@ sdbout_end_block (unsigned int line, uns
    number LINE.  */
 
 static void
-sdbout_source_line (unsigned int line, const char *filename ATTRIBUTE_UNUSED)
+sdbout_source_line (unsigned int line, const char *filename ATTRIBUTE_UNUSED,
+                    int discriminator ATTRIBUTE_UNUSED)
 {
   /* COFF relative line numbers must be positive.  */
   if ((int) line > sdb_begin_function_line)
Index: tree-cfg.c
===================================================================
--- tree-cfg.c	(revision 148110)
+++ tree-cfg.c	(working copy)
@@ -82,6 +82,14 @@ static struct cfg_stats_d cfg_stats;
 /* Nonzero if we found a computed goto while building basic blocks.  */
 static bool found_computed_goto;
 
+/* Hash table to store last discriminator assigned for each locus.  */
+struct locus_discrim_map
+{
+  location_t locus;
+  int discriminator;
+};
+static htab_t discriminator_per_locus;
+
 /* Basic blocks and flowgraphs.  */
 static void make_blocks (gimple_seq);
 static void factor_computed_gotos (void);
@@ -91,6 +99,9 @@ static void make_edges (void);
 static void make_cond_expr_edges (basic_block);
 static void make_gimple_switch_edges (basic_block);
 static void make_goto_expr_edges (basic_block);
+static unsigned int locus_map_hash (const void *);
+static int locus_map_eq (const void *, const void *);
+static void assign_discriminator (location_t, basic_block);
 static edge gimple_redirect_edge_and_branch (edge, basic_block);
 static edge gimple_try_redirect_by_replacing_jump (edge, basic_block);
 static unsigned int split_critical_edges (void);
@@ -100,6 +111,7 @@ static inline bool stmt_starts_bb_p (gim
 static int gimple_verify_flow_info (void);
 static void gimple_make_forwarder_block (edge);
 static void gimple_cfg2vcg (FILE *);
+static gimple first_non_label_stmt (basic_block);
 
 /* Flowgraph optimization and cleanup.  */
 static void gimple_merge_blocks (basic_block, basic_block);
@@ -193,8 +205,11 @@ build_gimple_cfg (gimple_seq seq)
   group_case_labels ();
 
   /* Create the edges of the flowgraph.  */
+  discriminator_per_locus = htab_create (13, locus_map_hash, locus_map_eq,
+                                         free);
   make_edges ();
   cleanup_dead_labels ();
+  htab_delete (discriminator_per_locus);
 
   /* Debugging dumps.  */
 
@@ -650,7 +665,11 @@ make_edges (void)
 	fallthru = true;
 
       if (fallthru)
-	make_edge (bb, bb->next_bb, EDGE_FALLTHRU);
+        {
+	  make_edge (bb, bb->next_bb, EDGE_FALLTHRU);
+	  if (last)
+            assign_discriminator (gimple_location (last), bb->next_bb);
+	}
     }
 
   if (root_omp_region)
@@ -660,6 +679,89 @@ make_edges (void)
   fold_cond_expr_cond ();
 }
 
+/* Trivial hash function for a location_t.  ITEM is a pointer to
+   a hash table entry that maps a location_t to a discriminator.  */
+
+static unsigned int
+locus_map_hash (const void *item)
+{
+  return ((const struct locus_discrim_map *) item)->locus;
+}
+
+/* Equality function for the locus-to-discriminator map.  VA and VB
+   point to the two hash table entries to compare.  */
+
+static int
+locus_map_eq (const void *va, const void *vb)
+{
+  const struct locus_discrim_map *a = (const struct locus_discrim_map *) va;
+  const struct locus_discrim_map *b = (const struct locus_discrim_map *) vb;
+  return a->locus == b->locus;
+}
+
+/* Find the next available discriminator value for LOCUS.  The
+   discriminator distinguishes among several basic blocks that
+   share a common locus, allowing for more accurate sample-based
+   profiling.  */
+
+static int
+next_discriminator_for_locus (location_t locus)
+{
+  struct locus_discrim_map item;
+  struct locus_discrim_map **slot;
+
+  item.locus = locus;
+  item.discriminator = 0;
+  slot = (struct locus_discrim_map **)
+      htab_find_slot_with_hash (discriminator_per_locus, (void *) &item,
+                                (hashval_t) locus, INSERT);
+  gcc_assert (slot);
+  if (*slot == HTAB_EMPTY_ENTRY)
+    {
+      *slot = XNEW (struct locus_discrim_map);
+      gcc_assert (*slot);
+      (*slot)->locus = locus;
+      (*slot)->discriminator = 0;
+    }
+  (*slot)->discriminator++;
+  return (*slot)->discriminator;
+}
+
+/* Return TRUE if LOCUS1 and LOCUS2 refer to the same source line.  */
+
+static bool
+same_line_p (location_t locus1, location_t locus2)
+{
+  expanded_location from, to;
+
+  if (locus1 == locus2)
+    return true;
+
+  from = expand_location (locus1);
+  to = expand_location (locus2);
+
+  if (from.line != to.line)
+    return false;
+  if (from.file == to.file)
+    return true;
+  return strcmp (from.file, to.file);
+}
+
+/* Assign a unique discriminator value to block BB if it begins at the same
+   LOCUS as its predecessor block.  */
+
+static void
+assign_discriminator (location_t locus, basic_block bb)
+{
+  gimple to_stmt;
+
+  if (locus == 0 || bb->discriminator != 0)
+    return;
+
+  to_stmt = first_non_label_stmt (bb);
+  if (to_stmt && same_line_p (locus, gimple_location (to_stmt)))
+    bb->discriminator = next_discriminator_for_locus (locus);
+}
 
 /* Create the edges for a GIMPLE_COND starting at block BB.  */
 
@@ -671,10 +773,13 @@ make_cond_expr_edges (basic_block bb)
   basic_block then_bb, else_bb;
   tree then_label, else_label;
   edge e;
+  location_t entry_locus;
 
   gcc_assert (entry);
   gcc_assert (gimple_code (entry) == GIMPLE_COND);
 
+  entry_locus = gimple_location (entry);
+
   /* Entry basic blocks for each component.  */
   then_label = gimple_cond_true_label (entry);
   else_label = gimple_cond_false_label (entry);
@@ -684,12 +789,14 @@ make_cond_expr_edges (basic_block bb)
   else_stmt = first_stmt (else_bb);
 
   e = make_edge (bb, then_bb, EDGE_TRUE_VALUE);
+  assign_discriminator (entry_locus, then_bb);
   e->goto_locus = gimple_location (then_stmt);
   if (e->goto_locus)
     e->goto_block = gimple_block (then_stmt);
   e = make_edge (bb, else_bb, EDGE_FALSE_VALUE);
   if (e)
     {
+      assign_discriminator (entry_locus, else_bb);
       e->goto_locus = gimple_location (else_stmt);
       if (e->goto_locus)
 	e->goto_block = gimple_block (else_stmt);
@@ -799,8 +906,11 @@ static void
 make_gimple_switch_edges (basic_block bb)
 {
   gimple entry = last_stmt (bb);
+  location_t entry_locus;
   size_t i, n;
 
+  entry_locus = gimple_location (entry);
+
   n = gimple_switch_num_labels (entry);
 
   for (i = 0; i < n; ++i)
@@ -808,6 +918,7 @@ make_gimple_switch_edges (basic_block bb
       tree lab = CASE_LABEL (gimple_switch_label (entry, i));
       basic_block label_bb = label_to_block (lab);
       make_edge (bb, label_bb, 0);
+      assign_discriminator (entry_locus, label_bb);
     }
 }
 
@@ -880,8 +991,10 @@ make_goto_expr_edges (basic_block bb)
   if (simple_goto_p (goto_t))
     {
       tree dest = gimple_goto_dest (goto_t);
-      edge e = make_edge (bb, label_to_block (dest), EDGE_FALLTHRU);
+      basic_block label_bb = label_to_block (dest);
+      edge e = make_edge (bb, label_bb, EDGE_FALLTHRU);
       e->goto_locus = gimple_location (goto_t);
+      assign_discriminator (e->goto_locus, label_bb);
       if (e->goto_locus)
 	e->goto_block = gimple_block (goto_t);
       gsi_remove (&last, true);
@@ -2690,6 +2803,17 @@ first_stmt (basic_block bb)
   return !gsi_end_p (i) ? gsi_stmt (i) : NULL;
 }
 
+/* Return the first non-label statement in basic block BB.  */
+
+static gimple
+first_non_label_stmt (basic_block bb)
+{
+  gimple_stmt_iterator i = gsi_start_bb (bb);
+  while (!gsi_end_p (i) && gimple_code (gsi_stmt (i)) == GIMPLE_LABEL)
+    gsi_next (&i);
+  return !gsi_end_p (i) ? gsi_stmt (i) : NULL;
+}
+
 /* Return the last statement in basic block BB.  */
 
 gimple
Index: vmsdbgout.c
===================================================================
--- vmsdbgout.c	(revision 148110)
+++ vmsdbgout.c	(working copy)
@@ -173,7 +173,7 @@ static void vmsdbgout_end_source_file (u
 static void vmsdbgout_begin_block (unsigned int, unsigned int);
 static void vmsdbgout_end_block (unsigned int, unsigned int);
 static bool vmsdbgout_ignore_block (const_tree);
-static void vmsdbgout_source_line (unsigned int, const char *);
+static void vmsdbgout_source_line (unsigned int, const char *, int);
 static void vmsdbgout_begin_prologue (unsigned int, const char *);
 static void vmsdbgout_end_prologue (unsigned int, const char *);
 static void vmsdbgout_end_function (unsigned int);
@@ -1297,7 +1297,7 @@ vmsdbgout_end_prologue (unsigned int lin
       ASM_OUTPUT_LABEL (asm_out_file, label);
 
       /* VMS PCA expects every PC range to correlate to some line and file.  */
-      vmsdbgout_source_line (line, file);
+      vmsdbgout_source_line (line, file, 0);
     }
 }
 
@@ -1331,7 +1331,7 @@ vmsdbgout_end_epilogue (unsigned int lin
       ASM_OUTPUT_LABEL (asm_out_file, label);
 
       /* VMS PCA expects every PC range to correlate to some line and file.  */
-      vmsdbgout_source_line (line, file);
+      vmsdbgout_source_line (line, file, 0);
     }
 }
 
@@ -1533,10 +1533,11 @@ lookup_filename (const char *file_name)
    'line_info_table' for later output of the .debug_line section.  */
 
 static void
-vmsdbgout_source_line (register unsigned line, register const char *filename)
+vmsdbgout_source_line (register unsigned line, register const char *filename,
+                       int discriminator)
 {
   if (write_symbols == VMS_AND_DWARF2_DEBUG)
-    (*dwarf2_debug_hooks.source_line) (line, filename);
+    (*dwarf2_debug_hooks.source_line) (line, filename, discriminator);
 
   if (debug_info_level >= DINFO_LEVEL_TERSE)
     {
Index: xcoffout.c
===================================================================
--- xcoffout.c	(revision 148110)
+++ xcoffout.c	(working copy)
@@ -321,7 +321,8 @@ xcoffout_source_file (FILE *file, const 
 /* Output a line number symbol entry for location (FILENAME, LINE).  */
 
 void
-xcoffout_source_line (unsigned int line, const char *filename)
+xcoffout_source_line (unsigned int line, const char *filename,
+                      int discriminator ATTRIBUTE_UNUSED)
 {
   bool inline_p = (strcmp (xcoff_current_function_file, filename) != 0
 		   || (int) line < xcoff_begin_function_line);

^ permalink raw reply	[flat|nested] 15+ messages in thread

* Re: [patch] Add discriminators to DWARF line table
  2009-06-03  1:03             ` Cary Coutant
@ 2009-06-03 11:44               ` Diego Novillo
  2009-06-03 14:26               ` Tom Tromey
  1 sibling, 0 replies; 15+ messages in thread
From: Diego Novillo @ 2009-06-03 11:44 UTC (permalink / raw)
  To: Cary Coutant; +Cc: gcc-patches

On Tue, Jun 2, 2009 at 21:03, Cary Coutant <ccoutant@google.com> wrote:

> New patch is attached.  I've done an overdue svn update on my working
> copy, so I'll bootstrap and test again. Assuming that works, is this
> OK?

Sure.  Thanks.


Diego.

^ permalink raw reply	[flat|nested] 15+ messages in thread

* Re: [patch] Add discriminators to DWARF line table
  2009-06-03  1:03             ` Cary Coutant
  2009-06-03 11:44               ` Diego Novillo
@ 2009-06-03 14:26               ` Tom Tromey
  2009-06-03 15:15                 ` Diego Novillo
  1 sibling, 1 reply; 15+ messages in thread
From: Tom Tromey @ 2009-06-03 14:26 UTC (permalink / raw)
  To: gcc-patches

>>>>> "Cary" == Cary Coutant <ccoutant@google.com> writes:

Cary> It looks like the string pointers may not be the same if there's an
Cary> intervening #line directive. I've changed this to do a quick pointer
Cary> comparison, then fall back to a strcmp:

Cary>   if (from.line != to.line)
Cary>     return false;
Cary>   if (from.file == to.file)
Cary>     return true;
Cary>   return strcmp (from.file, to.file);

I think that should be: return !strcmp (...)

Tom

^ permalink raw reply	[flat|nested] 15+ messages in thread

* Re: [patch] Add discriminators to DWARF line table
  2009-06-03 14:26               ` Tom Tromey
@ 2009-06-03 15:15                 ` Diego Novillo
  2009-06-03 18:47                   ` Cary Coutant
  0 siblings, 1 reply; 15+ messages in thread
From: Diego Novillo @ 2009-06-03 15:15 UTC (permalink / raw)
  To: tromey; +Cc: gcc-patches

On Wed, Jun 3, 2009 at 10:26, Tom Tromey <tromey@redhat.com> wrote:

> Cary>   return strcmp (from.file, to.file);
>
> I think that should be: return !strcmp (...)

Good catch, but let's use strcmp(...) == 0, please.


Diego.

^ permalink raw reply	[flat|nested] 15+ messages in thread

* Re: [patch] Add discriminators to DWARF line table
  2009-06-03 15:15                 ` Diego Novillo
@ 2009-06-03 18:47                   ` Cary Coutant
  2009-06-04 22:27                     ` Cary Coutant
  0 siblings, 1 reply; 15+ messages in thread
From: Cary Coutant @ 2009-06-03 18:47 UTC (permalink / raw)
  To: Diego Novillo; +Cc: tromey, gcc-patches

>> Cary>   return strcmp (from.file, to.file);
>>
>> I think that should be: return !strcmp (...)
>
> Good catch, but let's use strcmp(...) == 0, please.

Yes, thanks!

(I should know better than to fire off an untested patch -- no matter
how trivial the change -- just before leaving for the day.)

-cary

^ permalink raw reply	[flat|nested] 15+ messages in thread

* Re: [patch] Add discriminators to DWARF line table
  2009-06-03 18:47                   ` Cary Coutant
@ 2009-06-04 22:27                     ` Cary Coutant
  0 siblings, 0 replies; 15+ messages in thread
From: Cary Coutant @ 2009-06-04 22:27 UTC (permalink / raw)
  To: Diego Novillo; +Cc: tromey, gcc-patches

[-- Attachment #1: Type: text/plain, Size: 2068 bytes --]

>>> Cary>   return strcmp (from.file, to.file);
>>>
>>> I think that should be: return !strcmp (...)
>>
>> Good catch, but let's use strcmp(...) == 0, please.

Turns out I also neglected to check for NULL pointers. After fixing
that, a bootstrap was successful, and there were no new regressions.
Here's the patch I'm committing, based on Diego's earlier approval.

-cary


	* basic-block.h (struct basic_block_def): Add discriminator field.
	* dbxout.c (dbxout_source_line): Add new parameter.  Change all
	callers.
	* debug.c (do_nothing_debug_hooks): Add additional entry.
	(debug_nothing_int_charstar_int): New function.
	* debug.h (struct gcc_debug_hooks): Add parameter to source_line
	hook.
	(debug_nothing_int_charstar_int): New declaration.
	* dwarf2out.c (dwarf2out_source_line): Add new parameter.  Write
	discriminator value in .loc directive.
	* final.c (last_discriminator): New variable.
	(discriminator): New variable.
	(final_start_function): Initialize above variables, pass current
	discriminator to debug hook.
	(notice_source_line): Check for discriminator change.
	* gimple-pretty-print.c (dump_bb_header): Print discriminator value.
	* sdbout.c (sdbout_source_line): New parameter.
	* tree-cfg.c (struct locus_discrim_map): New structure type.
	(discriminator_per_locus): New hash table.
	(build_gimple_cfg): Allocate and free discriminator hash table.
	(make_edges): Call assign_discriminator.
	(locus_map_hash): New function.
	(locus_map_eq): New function.
	(next_discriminator_for_locus): New function.
	(same_line_p): New function.
	(assign_discriminator): New function.
	(make_cond_expr_edges): Call assign_discriminator.
	(make_gimple_switch_edges): Likewise.
	(first_non_label_stmt): New function.
	* vmsdbgout.c (vmsdbgout_source_line): Add new parameter.  Change
	all callers.
	* xcoffout.c (xcoffout_source_line): Add new parameter.

	* configure.ac (gcc_cv_as_discriminator): New configury check for
	gas support for discriminator.
	* configure: Regenerate.
	* config.in: Regenerate.

[-- Attachment #2: gcc-discrim-patch-4.txt --]
[-- Type: text/plain, Size: 19661 bytes --]

Index: basic-block.h
===================================================================
--- basic-block.h	(revision 148190)
+++ basic-block.h	(working copy)
@@ -249,6 +249,9 @@ struct GTY((chain_next ("%h.next_bb"), c
   /* Expected frequency.  Normalized to be in range 0 to BB_FREQ_MAX.  */
   int frequency;
 
+  /* The discriminator for this block.  */
+  int discriminator;
+
   /* Various flags.  See BB_* below.  */
   int flags;
 };
Index: dbxout.c
===================================================================
--- dbxout.c	(revision 148190)
+++ dbxout.c	(working copy)
@@ -333,7 +333,7 @@ static void dbxout_handle_pch (unsigned)
 /* The debug hooks structure.  */
 #if defined (DBX_DEBUGGING_INFO)
 
-static void dbxout_source_line (unsigned int, const char *);
+static void dbxout_source_line (unsigned int, const char *, int);
 static void dbxout_begin_prologue (unsigned int, const char *);
 static void dbxout_source_file (const char *);
 static void dbxout_function_end (tree);
@@ -1265,7 +1265,7 @@ dbxout_begin_prologue (unsigned int line
   /* pre-increment the scope counter */
   scope_labelno++;
 
-  dbxout_source_line (lineno, filename);
+  dbxout_source_line (lineno, filename, 0);
   /* Output function begin block at function scope, referenced 
      by dbxout_block, dbxout_source_line and dbxout_function_end.  */
   emit_pending_bincls_if_required ();
@@ -1276,7 +1276,8 @@ dbxout_begin_prologue (unsigned int line
    number LINENO.  */
 
 static void
-dbxout_source_line (unsigned int lineno, const char *filename)
+dbxout_source_line (unsigned int lineno, const char *filename,
+                    int discriminator ATTRIBUTE_UNUSED)
 {
   dbxout_source_file (filename);
 
Index: debug.c
===================================================================
--- debug.c	(revision 148190)
+++ debug.c	(working copy)
@@ -34,7 +34,7 @@ const struct gcc_debug_hooks do_nothing_
   debug_nothing_int_int,	         /* begin_block */
   debug_nothing_int_int,	         /* end_block */
   debug_true_const_tree,	         /* ignore_block */
-  debug_nothing_int_charstar,	         /* source_line */
+  debug_nothing_int_charstar_int,	 /* source_line */
   debug_nothing_int_charstar,	         /* begin_prologue */
   debug_nothing_int_charstar,	         /* end_prologue */
   debug_nothing_int_charstar,	         /* end_epilogue */
@@ -104,6 +104,13 @@ debug_nothing_int_charstar (unsigned int
 }
 
 void
+debug_nothing_int_charstar_int (unsigned int line ATTRIBUTE_UNUSED,
+			        const char *text ATTRIBUTE_UNUSED,
+			        int discriminator ATTRIBUTE_UNUSED)
+{
+}
+
+void
 debug_nothing_int (unsigned int line ATTRIBUTE_UNUSED)
 {
 }
Index: debug.h
===================================================================
--- debug.h	(revision 148190)
+++ debug.h	(working copy)
@@ -59,8 +59,9 @@ struct gcc_debug_hooks
      though the BLOCK information is messed up.  Defaults to true.  */
   bool (* ignore_block) (const_tree);
 
-  /* Record a source file location at (FILE, LINE).  */
-  void (* source_line) (unsigned int line, const char *file);
+  /* Record a source file location at (FILE, LINE, DISCRIMINATOR).  */
+  void (* source_line) (unsigned int line, const char *file,
+                        int discriminator);
 
   /* Called at start of prologue code.  LINE is the first line in the
      function.  This has been given the same prototype as source_line,
@@ -141,6 +142,7 @@ extern const struct gcc_debug_hooks *deb
 extern void debug_nothing_void (void);
 extern void debug_nothing_charstar (const char *);
 extern void debug_nothing_int_charstar (unsigned int, const char *);
+extern void debug_nothing_int_charstar_int (unsigned int, const char *, int);
 extern void debug_nothing_int (unsigned int);
 extern void debug_nothing_int_int (unsigned int, unsigned int);
 extern void debug_nothing_tree (tree);
Index: dwarf2out.c
===================================================================
--- dwarf2out.c	(revision 148190)
+++ dwarf2out.c	(working copy)
@@ -91,7 +91,7 @@ along with GCC; see the file COPYING3.  
 #include "input.h"
 
 #ifdef DWARF2_DEBUGGING_INFO
-static void dwarf2out_source_line (unsigned int, const char *);
+static void dwarf2out_source_line (unsigned int, const char *, int);
 #endif
 
 #ifndef DWARF2_FRAME_INFO
@@ -3608,7 +3608,7 @@ dwarf2out_begin_prologue (unsigned int l
      prologue case, not the eh frame case.  */
 #ifdef DWARF2_DEBUGGING_INFO
   if (file)
-    dwarf2out_source_line (line, file);
+    dwarf2out_source_line (line, file, 0);
 #endif
 
   if (dwarf2out_do_cfi_asm ())
@@ -16207,7 +16207,8 @@ dwarf2out_begin_function (tree fun)
    'line_info_table' for later output of the .debug_line section.  */
 
 static void
-dwarf2out_source_line (unsigned int line, const char *filename)
+dwarf2out_source_line (unsigned int line, const char *filename,
+                       int discriminator)
 {
   if (debug_info_level >= DINFO_LEVEL_NORMAL
       && line != 0)
@@ -16224,7 +16225,12 @@ dwarf2out_source_line (unsigned int line
       if (DWARF2_ASM_LINE_DEBUG_INFO)
 	{
 	  /* Emit the .loc directive understood by GNU as.  */
-	  fprintf (asm_out_file, "\t.loc %d %d 0\n", file_num, line);
+	  fprintf (asm_out_file, "\t.loc %d %d 0", file_num, line);
+#ifdef HAVE_GAS_DISCRIMINATOR
+	  if (discriminator != 0)
+	    fprintf (asm_out_file, " discriminator %d", discriminator);
+#endif /* HAVE_GAS_DISCRIMINATOR */
+	  fputc ('\n', asm_out_file);
 
 	  /* Indicate that line number info exists.  */
 	  line_info_table_in_use++;
Index: final.c
===================================================================
--- final.c	(revision 148190)
+++ final.c	(working copy)
@@ -130,6 +130,12 @@ rtx current_output_insn;
 /* Line number of last NOTE.  */
 static int last_linenum;
 
+/* Last discriminator written to assembly.  */
+static int last_discriminator;
+
+/* Discriminator of current block.  */
+static int discriminator;
+
 /* Highest line number in current block.  */
 static int high_block_linenum;
 
@@ -1496,6 +1502,7 @@ final_start_function (rtx first ATTRIBUT
 
   last_filename = locator_file (prologue_locator);
   last_linenum = locator_line (prologue_locator);
+  last_discriminator = discriminator = 0;
 
   high_block_linenum = high_function_linenum = last_linenum;
 
@@ -1852,6 +1859,8 @@ final_scan_insn (rtx insn, FILE *file, i
 	  else
 	    *seen |= SEEN_BB;
 
+          discriminator = NOTE_BASIC_BLOCK (insn)->discriminator;
+
 	  break;
 
 	case NOTE_INSN_EH_REGION_BEG:
@@ -2183,7 +2192,9 @@ final_scan_insn (rtx insn, FILE *file, i
 	   note in a row.  */
 	if (notice_source_line (insn))
 	  {
-	    (*debug_hooks->source_line) (last_linenum, last_filename);
+	    (*debug_hooks->source_line) (last_linenum,
+	                                 last_filename,
+	                                 last_discriminator);
 	  }
 
 	if (GET_CODE (body) == ASM_INPUT)
@@ -2709,11 +2720,13 @@ notice_source_line (rtx insn)
   if (filename
       && (force_source_line
 	  || filename != last_filename
-	  || last_linenum != linenum))
+	  || last_linenum != linenum
+	  || last_discriminator != discriminator))
     {
       force_source_line = false;
       last_filename = filename;
       last_linenum = linenum;
+      last_discriminator = discriminator;
       high_block_linenum = MAX (last_linenum, high_block_linenum);
       high_function_linenum = MAX (last_linenum, high_function_linenum);
       return true;
Index: gimple-pretty-print.c
===================================================================
--- gimple-pretty-print.c	(revision 148190)
+++ gimple-pretty-print.c	(working copy)
@@ -1558,6 +1558,12 @@ dump_bb_header (pretty_printer *buffer, 
 		pp_decimal_int (buffer, get_lineno (gsi_stmt (gsi)));
 		break;
 	      }
+
+          if (bb->discriminator)
+            {
+              pp_string (buffer, ", discriminator ");
+	      pp_decimal_int (buffer, bb->discriminator);
+            }
 	}
       newline_and_indent (buffer, indent);
 
Index: sdbout.c
===================================================================
--- sdbout.c	(revision 148190)
+++ sdbout.c	(working copy)
@@ -117,7 +117,7 @@ static void sdbout_start_source_file	(un
 static void sdbout_end_source_file	(unsigned int);
 static void sdbout_begin_block		(unsigned int, unsigned int);
 static void sdbout_end_block		(unsigned int, unsigned int);
-static void sdbout_source_line		(unsigned int, const char *);
+static void sdbout_source_line		(unsigned int, const char *, int);
 static void sdbout_end_epilogue		(unsigned int, const char *);
 static void sdbout_global_decl		(tree);
 #ifndef MIPS_DEBUGGING_INFO
@@ -1541,7 +1541,8 @@ sdbout_end_block (unsigned int line, uns
    number LINE.  */
 
 static void
-sdbout_source_line (unsigned int line, const char *filename ATTRIBUTE_UNUSED)
+sdbout_source_line (unsigned int line, const char *filename ATTRIBUTE_UNUSED,
+                    int discriminator ATTRIBUTE_UNUSED)
 {
   /* COFF relative line numbers must be positive.  */
   if ((int) line > sdb_begin_function_line)
Index: tree-cfg.c
===================================================================
--- tree-cfg.c	(revision 148190)
+++ tree-cfg.c	(working copy)
@@ -82,6 +82,14 @@ static struct cfg_stats_d cfg_stats;
 /* Nonzero if we found a computed goto while building basic blocks.  */
 static bool found_computed_goto;
 
+/* Hash table to store last discriminator assigned for each locus.  */
+struct locus_discrim_map
+{
+  location_t locus;
+  int discriminator;
+};
+static htab_t discriminator_per_locus;
+
 /* Basic blocks and flowgraphs.  */
 static void make_blocks (gimple_seq);
 static void factor_computed_gotos (void);
@@ -91,6 +99,9 @@ static void make_edges (void);
 static void make_cond_expr_edges (basic_block);
 static void make_gimple_switch_edges (basic_block);
 static void make_goto_expr_edges (basic_block);
+static unsigned int locus_map_hash (const void *);
+static int locus_map_eq (const void *, const void *);
+static void assign_discriminator (location_t, basic_block);
 static edge gimple_redirect_edge_and_branch (edge, basic_block);
 static edge gimple_try_redirect_by_replacing_jump (edge, basic_block);
 static unsigned int split_critical_edges (void);
@@ -100,6 +111,7 @@ static inline bool stmt_starts_bb_p (gim
 static int gimple_verify_flow_info (void);
 static void gimple_make_forwarder_block (edge);
 static void gimple_cfg2vcg (FILE *);
+static gimple first_non_label_stmt (basic_block);
 
 /* Flowgraph optimization and cleanup.  */
 static void gimple_merge_blocks (basic_block, basic_block);
@@ -193,8 +205,11 @@ build_gimple_cfg (gimple_seq seq)
   group_case_labels ();
 
   /* Create the edges of the flowgraph.  */
+  discriminator_per_locus = htab_create (13, locus_map_hash, locus_map_eq,
+                                         free);
   make_edges ();
   cleanup_dead_labels ();
+  htab_delete (discriminator_per_locus);
 
   /* Debugging dumps.  */
 
@@ -650,7 +665,11 @@ make_edges (void)
 	fallthru = true;
 
       if (fallthru)
-	make_edge (bb, bb->next_bb, EDGE_FALLTHRU);
+        {
+	  make_edge (bb, bb->next_bb, EDGE_FALLTHRU);
+	  if (last)
+            assign_discriminator (gimple_location (last), bb->next_bb);
+	}
     }
 
   if (root_omp_region)
@@ -660,6 +679,91 @@ make_edges (void)
   fold_cond_expr_cond ();
 }
 
+/* Trivial hash function for a location_t.  ITEM is a pointer to
+   a hash table entry that maps a location_t to a discriminator.  */
+
+static unsigned int
+locus_map_hash (const void *item)
+{
+  return ((const struct locus_discrim_map *) item)->locus;
+}
+
+/* Equality function for the locus-to-discriminator map.  VA and VB
+   point to the two hash table entries to compare.  */
+
+static int
+locus_map_eq (const void *va, const void *vb)
+{
+  const struct locus_discrim_map *a = (const struct locus_discrim_map *) va;
+  const struct locus_discrim_map *b = (const struct locus_discrim_map *) vb;
+  return a->locus == b->locus;
+}
+
+/* Find the next available discriminator value for LOCUS.  The
+   discriminator distinguishes among several basic blocks that
+   share a common locus, allowing for more accurate sample-based
+   profiling.  */
+
+static int
+next_discriminator_for_locus (location_t locus)
+{
+  struct locus_discrim_map item;
+  struct locus_discrim_map **slot;
+
+  item.locus = locus;
+  item.discriminator = 0;
+  slot = (struct locus_discrim_map **)
+      htab_find_slot_with_hash (discriminator_per_locus, (void *) &item,
+                                (hashval_t) locus, INSERT);
+  gcc_assert (slot);
+  if (*slot == HTAB_EMPTY_ENTRY)
+    {
+      *slot = XNEW (struct locus_discrim_map);
+      gcc_assert (*slot);
+      (*slot)->locus = locus;
+      (*slot)->discriminator = 0;
+    }
+  (*slot)->discriminator++;
+  return (*slot)->discriminator;
+}
+
+/* Return TRUE if LOCUS1 and LOCUS2 refer to the same source line.  */
+
+static bool
+same_line_p (location_t locus1, location_t locus2)
+{
+  expanded_location from, to;
+
+  if (locus1 == locus2)
+    return true;
+
+  from = expand_location (locus1);
+  to = expand_location (locus2);
+
+  if (from.line != to.line)
+    return false;
+  if (from.file == to.file)
+    return true;
+  return (from.file != NULL
+          && to.file != NULL
+          && strcmp (from.file, to.file) == 0);
+}
+
+/* Assign a unique discriminator value to block BB if it begins at the same
+   LOCUS as its predecessor block.  */
+
+static void
+assign_discriminator (location_t locus, basic_block bb)
+{
+  gimple to_stmt;
+
+  if (locus == 0 || bb->discriminator != 0)
+    return;
+
+  to_stmt = first_non_label_stmt (bb);
+  if (to_stmt && same_line_p (locus, gimple_location (to_stmt)))
+    bb->discriminator = next_discriminator_for_locus (locus);
+}
 
 /* Create the edges for a GIMPLE_COND starting at block BB.  */
 
@@ -671,10 +775,13 @@ make_cond_expr_edges (basic_block bb)
   basic_block then_bb, else_bb;
   tree then_label, else_label;
   edge e;
+  location_t entry_locus;
 
   gcc_assert (entry);
   gcc_assert (gimple_code (entry) == GIMPLE_COND);
 
+  entry_locus = gimple_location (entry);
+
   /* Entry basic blocks for each component.  */
   then_label = gimple_cond_true_label (entry);
   else_label = gimple_cond_false_label (entry);
@@ -684,12 +791,14 @@ make_cond_expr_edges (basic_block bb)
   else_stmt = first_stmt (else_bb);
 
   e = make_edge (bb, then_bb, EDGE_TRUE_VALUE);
+  assign_discriminator (entry_locus, then_bb);
   e->goto_locus = gimple_location (then_stmt);
   if (e->goto_locus)
     e->goto_block = gimple_block (then_stmt);
   e = make_edge (bb, else_bb, EDGE_FALSE_VALUE);
   if (e)
     {
+      assign_discriminator (entry_locus, else_bb);
       e->goto_locus = gimple_location (else_stmt);
       if (e->goto_locus)
 	e->goto_block = gimple_block (else_stmt);
@@ -799,8 +908,11 @@ static void
 make_gimple_switch_edges (basic_block bb)
 {
   gimple entry = last_stmt (bb);
+  location_t entry_locus;
   size_t i, n;
 
+  entry_locus = gimple_location (entry);
+
   n = gimple_switch_num_labels (entry);
 
   for (i = 0; i < n; ++i)
@@ -808,6 +920,7 @@ make_gimple_switch_edges (basic_block bb
       tree lab = CASE_LABEL (gimple_switch_label (entry, i));
       basic_block label_bb = label_to_block (lab);
       make_edge (bb, label_bb, 0);
+      assign_discriminator (entry_locus, label_bb);
     }
 }
 
@@ -880,8 +993,10 @@ make_goto_expr_edges (basic_block bb)
   if (simple_goto_p (goto_t))
     {
       tree dest = gimple_goto_dest (goto_t);
-      edge e = make_edge (bb, label_to_block (dest), EDGE_FALLTHRU);
+      basic_block label_bb = label_to_block (dest);
+      edge e = make_edge (bb, label_bb, EDGE_FALLTHRU);
       e->goto_locus = gimple_location (goto_t);
+      assign_discriminator (e->goto_locus, label_bb);
       if (e->goto_locus)
 	e->goto_block = gimple_block (goto_t);
       gsi_remove (&last, true);
@@ -2690,6 +2805,17 @@ first_stmt (basic_block bb)
   return !gsi_end_p (i) ? gsi_stmt (i) : NULL;
 }
 
+/* Return the first non-label statement in basic block BB.  */
+
+static gimple
+first_non_label_stmt (basic_block bb)
+{
+  gimple_stmt_iterator i = gsi_start_bb (bb);
+  while (!gsi_end_p (i) && gimple_code (gsi_stmt (i)) == GIMPLE_LABEL)
+    gsi_next (&i);
+  return !gsi_end_p (i) ? gsi_stmt (i) : NULL;
+}
+
 /* Return the last statement in basic block BB.  */
 
 gimple
Index: vmsdbgout.c
===================================================================
--- vmsdbgout.c	(revision 148190)
+++ vmsdbgout.c	(working copy)
@@ -173,7 +173,7 @@ static void vmsdbgout_end_source_file (u
 static void vmsdbgout_begin_block (unsigned int, unsigned int);
 static void vmsdbgout_end_block (unsigned int, unsigned int);
 static bool vmsdbgout_ignore_block (const_tree);
-static void vmsdbgout_source_line (unsigned int, const char *);
+static void vmsdbgout_source_line (unsigned int, const char *, int);
 static void vmsdbgout_begin_prologue (unsigned int, const char *);
 static void vmsdbgout_end_prologue (unsigned int, const char *);
 static void vmsdbgout_end_function (unsigned int);
@@ -1297,7 +1297,7 @@ vmsdbgout_end_prologue (unsigned int lin
       ASM_OUTPUT_LABEL (asm_out_file, label);
 
       /* VMS PCA expects every PC range to correlate to some line and file.  */
-      vmsdbgout_source_line (line, file);
+      vmsdbgout_source_line (line, file, 0);
     }
 }
 
@@ -1331,7 +1331,7 @@ vmsdbgout_end_epilogue (unsigned int lin
       ASM_OUTPUT_LABEL (asm_out_file, label);
 
       /* VMS PCA expects every PC range to correlate to some line and file.  */
-      vmsdbgout_source_line (line, file);
+      vmsdbgout_source_line (line, file, 0);
     }
 }
 
@@ -1533,10 +1533,11 @@ lookup_filename (const char *file_name)
    'line_info_table' for later output of the .debug_line section.  */
 
 static void
-vmsdbgout_source_line (register unsigned line, register const char *filename)
+vmsdbgout_source_line (register unsigned line, register const char *filename,
+                       int discriminator)
 {
   if (write_symbols == VMS_AND_DWARF2_DEBUG)
-    (*dwarf2_debug_hooks.source_line) (line, filename);
+    (*dwarf2_debug_hooks.source_line) (line, filename, discriminator);
 
   if (debug_info_level >= DINFO_LEVEL_TERSE)
     {
Index: xcoffout.c
===================================================================
--- xcoffout.c	(revision 148190)
+++ xcoffout.c	(working copy)
@@ -321,7 +321,8 @@ xcoffout_source_file (FILE *file, const 
 /* Output a line number symbol entry for location (FILENAME, LINE).  */
 
 void
-xcoffout_source_line (unsigned int line, const char *filename)
+xcoffout_source_line (unsigned int line, const char *filename,
+                      int discriminator ATTRIBUTE_UNUSED)
 {
   bool inline_p = (strcmp (xcoff_current_function_file, filename) != 0
 		   || (int) line < xcoff_begin_function_line);
Index: configure.ac
===================================================================
--- configure.ac	(revision 148190)
+++ configure.ac	(working copy)
@@ -2408,6 +2408,15 @@ AC_DEFINE_UNQUOTED(HAVE_COMDAT_GROUP,
   [`if test $gcc_cv_as_comdat_group = yes || test $gcc_cv_as_comdat_group_percent = yes; then echo 1; else echo 0; fi`],
 [Define 0/1 if your assembler and linker support COMDAT groups.])
 
+gcc_GAS_CHECK_FEATURE([line table discriminator support],
+ gcc_cv_as_discriminator,
+ [2,19,51],,
+[	.text
+	.file 1 "conf.c"
+	.loc 1 1 0 discriminator 1],,
+[AC_DEFINE(HAVE_GAS_DISCRIMINATOR, 1,
+  [Define if your assembler supports the .loc discriminator sub-directive.])])
+
 # Thread-local storage - the check is heavily parameterized.
 conftest_s=
 tls_first_major=

^ permalink raw reply	[flat|nested] 15+ messages in thread

* Re: [patch] Add discriminators to DWARF line table
@ 2009-06-05 18:01 David Edelsohn
  0 siblings, 0 replies; 15+ messages in thread
From: David Edelsohn @ 2009-06-05 18:01 UTC (permalink / raw)
  To: Cary Coutant; +Cc: Diego Novillo, tromey, gcc-patches

This patch broke AIX because it did not update the xcoffout prototype.

David

Index: xcoffout.h
===================================================================
--- xcoffout.h  (revision 148216)
+++ xcoffout.h  (working copy)
@@ -182,4 +182,4 @@
 extern void xcoffout_end_block (unsigned, unsigned);
 extern int xcoff_assign_fundamental_type_number (tree);
 extern void xcoffout_declare_function (FILE *, tree, const char *);
-extern void xcoffout_source_line (unsigned int, const char *);
+extern void xcoffout_source_line (unsigned int, const char *, int);

^ permalink raw reply	[flat|nested] 15+ messages in thread

* Re: [patch] Add discriminators to DWARF line table
  2009-05-13 22:01 [ping] " Cary Coutant
@ 2009-05-20 18:40 ` Cary Coutant
  0 siblings, 0 replies; 15+ messages in thread
From: Cary Coutant @ 2009-05-20 18:40 UTC (permalink / raw)
  To: gcc-patches; +Cc: Jim Wilson, Jason Merrill

Ping.

Jim or Jason, would either of you have the time to review this patch?

Current patch:

  http://gcc.gnu.org/ml/gcc-patches/2009-04/msg02388.html

Original posting with background info:

  http://gcc.gnu.org/ml/gcc-patches/2009-04/msg01679.html

-cary


	* basic-block.h (struct basic_block_def): Add discriminator field.
	* dbxout.c (dbxout_source_line): Add new parameter.  Change all
	callers.
	* debug.c (do_nothing_debug_hooks): Add additional entry.
	(debug_nothing_int_charstar_int): New function.
	* debug.h (struct gcc_debug_hooks): Add parameter to source_line
	hook.
	(debug_nothing_int_charstar_int): New declaration.
	* dwarf2out.c (dwarf2out_source_line): Add new parameter.  Write
	discriminator value in .loc directive.
	* final.c (last_discriminator): New variable.
	(discriminator): New variable.
	(final_start_function): Initialize above variables, pass current
	discriminator to debug hook.
	(notice_source_line): Check for discriminator change.
	* gimple-pretty-print.c (dump_bb_header): Print discriminator value.
	* sdbout.c (sdbout_source_line): New parameter.
	* tree-cfg.c (struct locus_discrim_map): New structure type.
	(discriminator_per_locus): New hash table.
	(build_gimple_cfg): Allocate and free discriminator hash table.
	(make_edges): Call assign_discriminator.
	(locus_map_hash): New function.
	(locus_map_eq): New function.
	(next_discriminator_for_locus): New function.
	(same_line_p): New function.
	(assign_discriminator): New function.
	(make_cond_expr_edges): Call assign_discriminator.
	(make_gimple_switch_edges): Likewise.
	(first_non_label_stmt): New function.
	* vmsdbgout.c (vmsdbgout_source_line): Add new parameter.  Change
	all callers.
	* xcoffout.c (xcoffout_source_line): Add new parameter.

	* configure.ac (gcc_cv_as_discriminator): New configury check for
	gas support for discriminator.
	* configure: Regenerate.
	* config.in: Regenerate.

^ permalink raw reply	[flat|nested] 15+ messages in thread

end of thread, other threads:[~2009-06-05 18:01 UTC | newest]

Thread overview: 15+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2009-04-21 23:16 [patch] Add discriminators to DWARF line table Cary Coutant
2009-04-22  4:19 ` Daniel Jacobowitz
2009-04-22 18:05   ` Cary Coutant
2009-04-23  0:39     ` Cary Coutant
2009-04-30  0:54       ` Cary Coutant
2009-06-02 20:38         ` Diego Novillo
2009-06-02 21:02           ` Cary Coutant
2009-06-03  1:03             ` Cary Coutant
2009-06-03 11:44               ` Diego Novillo
2009-06-03 14:26               ` Tom Tromey
2009-06-03 15:15                 ` Diego Novillo
2009-06-03 18:47                   ` Cary Coutant
2009-06-04 22:27                     ` Cary Coutant
2009-05-13 22:01 [ping] " Cary Coutant
2009-05-20 18:40 ` [patch] " Cary Coutant
2009-06-05 18:01 David Edelsohn

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