[Bug middle-end/46559] New: libstdc++ link FAILs with -flto

[Bug middle-end/46559] New: libstdc++ link FAILs with -flto

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46559

           Summary: libstdc++ link FAILs with -flto
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Keywords: lto
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: rguenth@gcc.gnu.org


make -k check-target-libstdc++-v3 RUNTESTFLAGS="--target_board=unix/-flto"

yields

FAIL: 27_io/basic_filebuf/close/12790-1.cc (test for excess errors)
WARNING: 27_io/basic_filebuf/close/12790-1.cc compilation failed to produce
exec
utable
FAIL: 27_io/basic_filebuf/cons/2020.cc (test for excess errors)
WARNING: 27_io/basic_filebuf/cons/2020.cc compilation failed to produce
executab
le
FAIL: 27_io/basic_filebuf/open/12790-1.cc (test for excess errors)
WARNING: 27_io/basic_filebuf/open/12790-1.cc compilation failed to produce
execu
table
FAIL: 27_io/basic_filebuf/seekoff/10132-2.cc (test for excess errors)
WARNING: 27_io/basic_filebuf/seekoff/10132-2.cc compilation failed to produce
ex
ecutable
FAIL: 27_io/basic_filebuf/seekoff/12790-1.cc (test for excess errors)
WARNING: 27_io/basic_filebuf/seekoff/12790-1.cc compilation failed to produce
ex
ecutable
FAIL: 27_io/basic_filebuf/seekoff/12790-2.cc (test for excess errors)
WARNING: 27_io/basic_filebuf/seekoff/12790-2.cc compilation failed to produce
ex
ecutable
FAIL: 27_io/basic_filebuf/seekoff/12790-3.cc (test for excess errors)
WARNING: 27_io/basic_filebuf/seekpos/10132-3.cc compilation failed to produce
ex
ecutable
FAIL: 27_io/basic_filebuf/seekpos/12790-2.cc (test for excess errors)
WARNING: 27_io/basic_filebuf/seekpos/12790-2.cc compilation failed to produce
ex
ecutable
FAIL: 27_io/basic_fstream/cons/1.cc (test for excess errors)
WARNING: 27_io/basic_fstream/cons/1.cc compilation failed to produce executable
FAIL: 27_io/basic_ifstream/cons/2020.cc (test for excess errors)
WARNING: 27_io/basic_ifstream/cons/2020.cc compilation failed to produce
executa
ble
FAIL: 27_io/basic_ofstream/cons/2020.cc (test for excess errors)
WARNING: 27_io/basic_ofstream/cons/2020.cc compilation failed to produce
executa
ble
FAIL: ext/enc_filebuf/char/13189.cc (test for excess errors)
WARNING: ext/enc_filebuf/char/13189.cc compilation failed to produce executable
FAIL: ext/enc_filebuf/char/13598.cc (test for excess errors)
WARNING: ext/enc_filebuf/char/13598.cc compilation failed to produce executable
FAIL: ext/enc_filebuf/wchar_t/13189.cc (test for excess errors)
WARNING: ext/enc_filebuf/wchar_t/13189.cc compilation failed to produce
executab
le

all with excess errors of the form

FAIL: 27_io/basic_filebuf/seekoff/12790-1.cc (test for excess errors)
Excess errors:
/tmp/ccXujZVx.ltrans0.ltrans.o:(.debug_info+0x1153): undefined reference to
`.LLST0'
/tmp/ccXujZVx.ltrans0.ltrans.o:(.debug_info+0x1169): undefined reference to
`.LLST1'
/tmp/ccXujZVx.ltrans0.ltrans.o:(.debug_info+0x126b): undefined reference to
`.LLST2'
/tmp/ccXujZVx.ltrans0.ltrans.o:(.debug_info+0x127c): undefined reference to
`.LLST3'
/tmp/ccXujZVx.ltrans0.ltrans.o:(.debug_info+0x129d): undefined reference to
`.LLST4'
...

[Bug middle-end/46559] libstdc++ link FAILs with -flto

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46559

--- Comment #1 from Richard Guenther <rguenth at gcc dot gnu.org> 2010-11-26 15:09:34 UTC ---
The FAILs also occur with -flto-partition=none.

Hm, looking at 27_io/basic_filebuf/underflow/10096.cc there are no location
lists at all in the LTO assembler:

        .section        .debug_loc,"",@progbits
.Ldebug_loc0:


dwarf2out.c:output_loc_list is never called, add_AT_loc_list is, so is
output_location_lists.

But the local var 'die' that is refered is the last in the limbo_die_list.
Do we expect this magically to be comp_unit_die?  For the testcase
in question it is a DW_TAG_structure_type.  With multiple comp-unit dies
as we now can have with LTO do we need to iterate through them for
the remaining parts of dwarf2out after limbo-die processing?

Well.

Index: dwarf2out.c
===================================================================
--- dwarf2out.c (revision 167177)
+++ dwarf2out.c (working copy)
@@ -23177,7 +23176,7 @@ dwarf2out_finish (const char *filename)
     add_AT_macptr (comp_unit_die (), DW_AT_macro_info, macinfo_section_label);

   if (have_location_lists)
-    optimize_location_lists (die);
+    optimize_location_lists (comp_unit_die ());

   /* Output all of the compilation units.  We put the main one last so that
      the offsets are available to output_pubnames.  */
@@ -23222,7 +23221,7 @@ dwarf2out_finish (const char *filename)
       ASM_GENERATE_INTERNAL_LABEL (loc_section_label,
                                   DEBUG_LOC_SECTION_LABEL, 0);
       ASM_OUTPUT_LABEL (asm_out_file, loc_section_label);
-      output_location_lists (die);
+      output_location_lists (comp_unit_die ());
     }

   /* Output public names table if necessary.  */

fixes this bug and makes sense anyway.

[Bug middle-end/46559] libstdc++ link FAILs with -flto

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46559

--- Comment #2 from Richard Guenther <rguenth at gcc dot gnu.org> 2010-11-26 16:01:33 UTC ---
Author: rguenth
Date: Fri Nov 26 16:01:26 2010
New Revision: 167181

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=167181
Log:
2010-11-26  Richard Guenther  <rguenther@suse.de>

    PR middle-end/46559
    * dwarf2out.c (dwarf2out_finish): Use comp_unit_die as root
    for location list processing.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/dwarf2out.c

[Bug middle-end/46559] libstdc++ link FAILs with -flto

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46559

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |FIXED
   Target Milestone|---                         |4.6.0

--- Comment #3 from Richard Guenther <rguenth at gcc dot gnu.org> 2010-11-26 16:01:47 UTC ---
Fixed.