[Bug target/55061] New: libbacktrace build fails during bootstrap on powerpc-apple-darwin9

[Bug target/55061] New: libbacktrace build fails during bootstrap on powerpc-apple-darwin9

[howarth at nitro dot med.uc.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55061

             Bug #: 55061
           Summary: libbacktrace build fails during bootstrap on
                    powerpc-apple-darwin9
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: howarth@nitro.med.uc.edu


The bootstrap of gcc trunk r192770 fails on powerpc-apple-darwin9 in
libbacktrace at...

/bin/sh ./libtool --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I.
-I../../gcc-4.8-20121024/libbacktrace  -I
../../gcc-4.8-20121024/libbacktrace/../include -I
../../gcc-4.8-20121024/libbacktrace/../libgcc -I ../libgcc -I ../gcc/include -I
../../gcc/include  -funwind-tables -W -Wall -Wwrite-strings -Wstrict-prototypes
-Wmissing-prototypes -Wold-style-definition -Wmissing-format-attribute
-Wcast-qual -Werror  -g -c -o dwarf.lo
../../gcc-4.8-20121024/libbacktrace/dwarf.c
libtool: compile:  gcc -DHAVE_CONFIG_H -I.
-I../../gcc-4.8-20121024/libbacktrace -I
../../gcc-4.8-20121024/libbacktrace/../include -I
../../gcc-4.8-20121024/libbacktrace/../libgcc -I ../libgcc -I ../gcc/include -I
../../gcc/include -funwind-tables -W -Wall -Wwrite-strings -Wstrict-prototypes
-Wmissing-prototypes -Wold-style-definition -Wmissing-format-attribute
-Wcast-qual -Werror -g -c ../../gcc-4.8-20121024/libbacktrace/dwarf.c -o
dwarf.o
/var/tmp//ccPfK3fM.s:10901:FATAL:Symbol _xstrnlen.eh already defined.
make[4]: *** [dwarf.lo] Error 1
make[3]: *** [all] Error 2
make[2]: *** [all-stage1-libbacktrace] Error 2
make[1]: *** [stage1-bubble] Error 2
make: *** [all] Error 2

 ../gcc-4.8-20121024/configure --prefix=/sw --prefix=/sw/lib/gcc4.8
--mandir=/sw/share/man --infodir=/sw/lib/gcc4.8/info --enable-languages=c,c++
,fortran,lto,objc,obj-c++,java --with-gmp=/sw --with-libiconv-prefix=/sw
--with-isl=/sw --with-cloog=/sw --with-mpc=/sw --with-system-zlib --enable-
checking=yes --x-includes=/usr/X11R6/include --x-libraries=/usr/X11R6/lib
--program-suffix=-fsf-4.8 --disable-cloog-version-check
--disable-libjava-multilib --disable-libquadmath

[Bug target/55061] libbacktrace build fails during bootstrap on powerpc-apple-darwin9

[howarth at nitro dot med.uc.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55061

--- Comment #1 from Jack Howarth <howarth at nitro dot med.uc.edu> 2012-10-24 17:52:30 UTC ---
Xcode 3.1.4
Component versions: DevToolsCore-1204.0; DevToolsSupport-1186.0
BuildVersion: 9M2809

[Bug target/55061] libbacktrace build fails during bootstrap on powerpc-apple-darwin9

[howarth at nitro dot med.uc.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55061

--- Comment #2 from Jack Howarth <howarth at nitro dot med.uc.edu> 2012-10-24 17:54:48 UTC ---
Created attachment 28521
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=28521
preprocessed source for libbacktrace/dwarf.c on powerpc-apple-darwin9

[Bug target/55061] libbacktrace build fails during bootstrap on powerpc-apple-darwin9

[howarth at nitro dot med.uc.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55061

--- Comment #3 from Jack Howarth <howarth at nitro dot med.uc.edu> 2012-10-24 17:55:34 UTC ---
Created attachment 28522
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=28522
assembly file for libbacktrace/dwarf.c on powerpc-apple-darwin9

[Bug target/55061] libbacktrace build fails during bootstrap on powerpc-apple-darwin9

[ian at airs dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55061

Ian Lance Taylor <ian at airs dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ian at airs dot com

--- Comment #4 from Ian Lance Taylor <ian at airs dot com> 2012-10-24 18:12:29 UTC ---
If I'm reading this correctly, we are invoking the Xcode gcc compiler with a
perfectly ordinary static function, and it is choking on it.  The only
references I see to xstrnlen in the preprocessed file are the static function
and the calls to it.

In the assembler file I see a bunch of symbols listed as FUNCTION.eh = 0
followed farther down in the file by FUNCTION.eh:.  xstrnlen just happens to be
the first.  So I guess this has nothing to do with xstrnlen as such.

Looking at the command line, I'm guessing that there is some bug with the
-funwind-tables option in the compiler you are using.  Does it work to compile

static int i() { return 0; }
int j() { return i; }

with -funwind-tables?

If that does not work, then I guess we need a configure test to see whether the
host GCC supports -funwind-tables with static functions.

[Bug target/55061] libbacktrace build fails during bootstrap on powerpc-apple-darwin9

[howarth at nitro dot med.uc.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55061

--- Comment #5 from Jack Howarth <howarth at nitro dot med.uc.edu> 2012-10-24 18:30:21 UTC ---
The testcase fails with the system compiler on powerpc-apple-darwin9, which
is...

gcc version 4.0.1 (Apple Inc. build 5493)

with the same error when compiled with '-funwind-tables'...

/var/tmp//cc0vWbZP.s:65:FATAL:Symbol _i.eh already defined. Using the Apple
gcc-4.2 compiler...

gcc version 4.2.1 (Apple Inc. build 5577)

compiles the test case without errors. Testing a bootstrap with
gcc-4.2/g++-4.2.

[Bug target/55061] libbacktrace build fails during bootstrap on powerpc-apple-darwin9

[ian at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55061

--- Comment #6 from ian at gcc dot gnu.org <ian at gcc dot gnu.org> 2012-10-24 21:09:59 UTC ---
Author: ian
Date: Wed Oct 24 21:09:55 2012
New Revision: 192782

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=192782
Log:
    PR target/55061
    * configure.ac: Check whether -funwind-tables option works.
    * configure: Rebuild.

Modified:
    trunk/libbacktrace/ChangeLog
    trunk/libbacktrace/configure
    trunk/libbacktrace/configure.ac

[Bug target/55061] libbacktrace build fails during bootstrap on powerpc-apple-darwin9

[ian at airs dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55061

Ian Lance Taylor <ian at airs dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |FIXED

--- Comment #7 from Ian Lance Taylor <ian at airs dot com> 2012-10-24 21:12:31 UTC ---
Should be fixed, please reopen if not.

[Bug target/55061] libbacktrace build fails during bootstrap on powerpc-apple-darwin9

[howarth at nitro dot med.uc.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55061

Jack Howarth <howarth at nitro dot med.uc.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |UNCONFIRMED
         Resolution|FIXED                       |

--- Comment #8 from Jack Howarth <howarth at nitro dot med.uc.edu> 2012-10-25 01:12:53 UTC ---
The failure has shifted now under gcc 4.0.1 to...

/bin/sh ./libtool --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I.
-I../../gcc-4.8-20121024/libbacktrace  -I
../../gcc-4.8-20121024/libbacktrace/../include -I
../../gcc-4.8-20121024/libbacktrace/../libgcc -I ../libgcc -I ../gcc/include -I
../../gcc/include   -W -Wall -Wwrite-strings -Wstrict-prototypes
-Wmissing-prototypes -Wold-style-definition -Wmissing-format-attribute
-Wcast-qual -Werror  -g -c -o backtrace.lo
../../gcc-4.8-20121024/libbacktrace/backtrace.c
libtool: compile:  gcc -DHAVE_CONFIG_H -I.
-I../../gcc-4.8-20121024/libbacktrace -I
../../gcc-4.8-20121024/libbacktrace/../include -I
../../gcc-4.8-20121024/libbacktrace/../libgcc -I ../libgcc -I ../gcc/include -I
../../gcc/include -W -Wall -Wwrite-strings -Wstrict-prototypes
-Wmissing-prototypes -Wold-style-definition -Wmissing-format-attribute
-Wcast-qual -Werror -g -c ../../gcc-4.8-20121024/libbacktrace/backtrace.c -o
backtrace.o
cc1: warnings being treated as errors
../../gcc-4.8-20121024/libbacktrace/backtrace.c: In function 'unwind':
../../gcc-4.8-20121024/libbacktrace/backtrace.c:69: warning: implicit
declaration of function '_Unwind_GetIPInfo'
make[4]: *** [backtrace.lo] Error 1
make[3]: *** [all] Error 2
make[2]: *** [all-stage1-libbacktrace] Error 2
make[1]: *** [stage1-bubble] Error 2

[Bug target/55061] libbacktrace build fails during bootstrap on powerpc-apple-darwin9

[ian at airs dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55061

--- Comment #9 from Ian Lance Taylor <ian at airs dot com> 2012-10-25 03:34:22 UTC ---
That's strange, because GCC 4.0 doesn't have _Unwind_GetIPInfo, so the
configure test that checks for it should have failed, and it should not have
been called.  Does the Xcode version of GCC have it?

[Bug target/55061] libbacktrace build fails during bootstrap on powerpc-apple-darwin9

[howarth at nitro dot med.uc.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55061

--- Comment #10 from Jack Howarth <howarth at nitro dot med.uc.edu> 2012-10-25 13:14:20 UTC ---
Created attachment 28529
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=28529
preprocessed source for libbacktrace/backtrace.c on powerpc-apple-darwin9 under
gcc 4.0.1

[Bug target/55061] libbacktrace build fails during bootstrap on powerpc-apple-darwin9

[howarth at nitro dot med.uc.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55061

--- Comment #11 from Jack Howarth <howarth at nitro dot med.uc.edu> 2012-10-25 13:15:39 UTC ---
Created attachment 28530
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=28530
config.log from libbacktrace subdirectory on powerpc-apple-darwin9 using gcc
4.0.1

[Bug target/55061] libbacktrace build fails during bootstrap on powerpc-apple-darwin9

[howarth at nitro dot med.uc.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55061

--- Comment #12 from Jack Howarth <howarth at nitro dot med.uc.edu> 2012-10-25 13:33:33 UTC ---
The diff between the preprocessed source of backtrace.c on gcc 4.0.1 and 4.2.1
is...


--- backtrace.i    2012-10-25 09:31:46.000000000 -0400+++ backtrace.i.gcc-4.2  
 2012-10-25 09:30:09.000000000 -0400
@@ -1,16 +1,16 @@
 # 1 "../../gcc-4.8-20121024/libbacktrace/backtrace.c"
 # 1 "/sw/src/fink.build/gcc48-4.8.0-1000/darwin_objdir/libbacktrace//"
 # 1 "<built-in>"
-# 1 "<command line>"
+# 1 "<command-line>"
 # 1 "../../gcc-4.8-20121024/libbacktrace/backtrace.c"
 # 33 "../../gcc-4.8-20121024/libbacktrace/backtrace.c"
 # 1 "./config.h" 1
 # 34 "../../gcc-4.8-20121024/libbacktrace/backtrace.c" 2

-# 1 "/usr/lib/gcc/powerpc-apple-darwin9/4.0.1/include/unwind.h" 1 3 4
-# 35 "/usr/lib/gcc/powerpc-apple-darwin9/4.0.1/include/unwind.h" 3 4
+# 1 "/usr/lib/gcc/powerpc-apple-darwin9/4.2.1/include/unwind.h" 1 3 4
+# 35 "/usr/lib/gcc/powerpc-apple-darwin9/4.2.1/include/unwind.h" 3 4
 #pragma GCC visibility push(default)
-# 46 "/usr/lib/gcc/powerpc-apple-darwin9/4.0.1/include/unwind.h" 3 4
+# 46 "/usr/lib/gcc/powerpc-apple-darwin9/4.2.1/include/unwind.h" 3 4
 typedef unsigned _Unwind_Word __attribute__((__mode__(__word__)));
 typedef signed _Unwind_Sword __attribute__((__mode__(__word__)));

@@ -40,7 +40,7 @@
   _URC_INSTALL_CONTEXT = 7,
   _URC_CONTINUE_UNWIND = 8
 } _Unwind_Reason_Code;
-# 83 "/usr/lib/gcc/powerpc-apple-darwin9/4.0.1/include/unwind.h" 3 4
+# 83 "/usr/lib/gcc/powerpc-apple-darwin9/4.2.1/include/unwind.h" 3 4
 struct _Unwind_Exception;

 typedef void (*_Unwind_Exception_Cleanup_Fn) (_Unwind_Reason_Code,
@@ -62,7 +62,7 @@


 typedef int _Unwind_Action;
-# 115 "/usr/lib/gcc/powerpc-apple-darwin9/4.0.1/include/unwind.h" 3 4
+# 115 "/usr/lib/gcc/powerpc-apple-darwin9/4.2.1/include/unwind.h" 3 4
 struct _Unwind_Context;


@@ -106,6 +106,7 @@
 extern void _Unwind_SetGR (struct _Unwind_Context *, int, _Unwind_Word);

 extern _Unwind_Ptr _Unwind_GetIP (struct _Unwind_Context *);
+extern _Unwind_Ptr _Unwind_GetIPInfo (struct _Unwind_Context *, int *);
 extern void _Unwind_SetIP (struct _Unwind_Context *, _Unwind_Ptr);


@@ -114,7 +115,7 @@
 extern void *_Unwind_GetLanguageSpecificData (struct _Unwind_Context *);

 extern _Unwind_Ptr _Unwind_GetRegionStart (struct _Unwind_Context *);
-# 182 "/usr/lib/gcc/powerpc-apple-darwin9/4.0.1/include/unwind.h" 3 4
+# 183 "/usr/lib/gcc/powerpc-apple-darwin9/4.2.1/include/unwind.h" 3 4
 typedef _Unwind_Reason_Code (*_Unwind_Personality_Fn)
      (int, _Unwind_Action, _Unwind_Exception_Class,
       struct _Unwind_Exception *, struct _Unwind_Context *);
@@ -132,7 +133,7 @@
      (struct _Unwind_Exception *, _Unwind_Stop_Fn, void *);
 extern void _Unwind_SjLj_Resume (struct _Unwind_Exception *);
 extern _Unwind_Reason_Code _Unwind_SjLj_Resume_or_Rethrow (struct
_Unwind_Exception *);
-# 224 "/usr/lib/gcc/powerpc-apple-darwin9/4.0.1/include/unwind.h" 3 4
+# 225 "/usr/lib/gcc/powerpc-apple-darwin9/4.2.1/include/unwind.h" 3 4
 extern _Unwind_Ptr _Unwind_GetDataRelBase (struct _Unwind_Context *);
 extern _Unwind_Ptr _Unwind_GetTextRelBase (struct _Unwind_Context *);

@@ -150,12 +151,12 @@
 # 36 "../../gcc-4.8-20121024/libbacktrace/backtrace.c" 2
 # 1 "../../gcc-4.8-20121024/libbacktrace/backtrace.h" 1
 # 36 "../../gcc-4.8-20121024/libbacktrace/backtrace.h"
-# 1 "/usr/lib/gcc/powerpc-apple-darwin9/4.0.1/include/stddef.h" 1 3 4
-# 152 "/usr/lib/gcc/powerpc-apple-darwin9/4.0.1/include/stddef.h" 3 4
+# 1 "/usr/lib/gcc/powerpc-apple-darwin9/4.2.1/include/stddef.h" 1 3 4
+# 152 "/usr/lib/gcc/powerpc-apple-darwin9/4.2.1/include/stddef.h" 3 4
 typedef int ptrdiff_t;
-# 214 "/usr/lib/gcc/powerpc-apple-darwin9/4.0.1/include/stddef.h" 3 4
+# 214 "/usr/lib/gcc/powerpc-apple-darwin9/4.2.1/include/stddef.h" 3 4
 typedef long unsigned int size_t;
-# 326 "/usr/lib/gcc/powerpc-apple-darwin9/4.0.1/include/stddef.h" 3 4
+# 326 "/usr/lib/gcc/powerpc-apple-darwin9/4.2.1/include/stddef.h" 3 4
 typedef int wchar_t;
 # 37 "../../gcc-4.8-20121024/libbacktrace/backtrace.h" 2
 # 1 "/usr/include/stdio.h" 1 3 4
@@ -505,8 +506,8 @@
 }
 # 38 "../../gcc-4.8-20121024/libbacktrace/backtrace.h" 2
 # 47 "../../gcc-4.8-20121024/libbacktrace/backtrace.h"
-# 1 "/usr/lib/gcc/powerpc-apple-darwin9/4.0.1/include/stdint.h" 1 3 4
-# 20 "/usr/lib/gcc/powerpc-apple-darwin9/4.0.1/include/stdint.h" 3 4
+# 1 "/usr/lib/gcc/powerpc-apple-darwin9/4.2.1/include/stdint.h" 1 3 4
+# 20 "/usr/lib/gcc/powerpc-apple-darwin9/4.2.1/include/stdint.h" 3 4
 typedef signed char int8_t;


@@ -585,7 +586,7 @@


 typedef long long int intmax_t;
-# 106 "/usr/lib/gcc/powerpc-apple-darwin9/4.0.1/include/stdint.h" 3 4
+# 106 "/usr/lib/gcc/powerpc-apple-darwin9/4.2.1/include/stdint.h" 3 4
 typedef long long unsigned int uintmax_t;
 # 48 "../../gcc-4.8-20121024/libbacktrace/backtrace.h" 2
 # 64 "../../gcc-4.8-20121024/libbacktrace/backtrace.h"

[Bug target/55061] libbacktrace build fails during bootstrap on powerpc-apple-darwin9

[howarth at nitro dot med.uc.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55061

--- Comment #13 from Jack Howarth <howarth at nitro dot med.uc.edu> 2012-10-25 13:47:21 UTC ---
% grep Unwind_GetIPInfo 
/usr/lib/gcc/powerpc-apple-darwin9/4.2.1/include/unwind.h
% extern _Unwind_Ptr _Unwind_GetIPInfo (struct _Unwind_Context *, int *);

% grep Unwind_GetIPInfo 
/usr/lib/gcc/powerpc-apple-darwin9/4.0.1/include/unwind.h
%

FYI, the original configure test for _Unwind_GetIPInfo was added in this
PR26792...

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26792#c11

I think this is a latent issue created by this commit...

r141804 | sje | 2008-11-12 16:35:46 -0500 (Wed, 12 Nov 2008) | 9 lines

        PR  target/27880

        * config/unwind_ipinfo.m4 (GCC_CHECK_UNWIND_GETIPINFO): Change from
        link test to target based test.
        * libstdc++/v3/configure.ac: Move call to GCC_CHECK_UNWIND_GETIPINFO.
        * libstdc++/v3/configure: Regenerate.
        * libjava/configure: Regenerate.

which doesn't take in account that on darwin9 only the gcc-4.2.1 compiler
provides _Unwind_GetIPInfo  through
/usr/lib/gcc/powerpc-apple-darwin9/4.2.1/include/unwind.h. This is a broken
test since gcc-4.2.1 isn't the default system compiler on
powerpc-apple-darwin9.

[Bug target/55061] libbacktrace build fails during bootstrap on powerpc-apple-darwin9

[howarth at nitro dot med.uc.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55061

--- Comment #14 from Jack Howarth <howarth at nitro dot med.uc.edu> 2012-10-25 14:11:38 UTC ---
Can we enhance the section in config/unwind_ipinfo.m4...

    # Darwin before version 9 does not have _Unwind_GetIPInfo.
    changequote(,)
    case ${target} in
      *-*-darwin[3-8]|*-*-darwin[3-8].*) have_unwind_getipinfo=no ;;
      *) have_unwind_getipinfo=yes ;;
    esac
    changequote([,])

with a new case instance of *-*-darwin9* that tests..

             AC_TRY_COMPILE([,[_Unwind_GetIPInfo();].
             [gcc_cv_getipinfo=yes],
             [gcc_cv_getipinfo=no])

in order to decided if  _Unwind_GetIPInfo is available?

[Bug target/55061] libbacktrace build fails during bootstrap on powerpc-apple-darwin9

[howarth at nitro dot med.uc.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55061

--- Comment #15 from Jack Howarth <howarth at nitro dot med.uc.edu> 2012-10-25 15:05:18 UTC ---
It unclear how to recraft the test. Adding...

--- unwind_ipinfo.m4.orig    2012-10-25 10:30:59.000000000 -0400
+++ unwind_ipinfo.m4    2012-10-25 11:04:37.000000000 -0400
@@ -26,6 +26,21 @@
     changequote(,)
     case ${target} in
       *-*-darwin[3-8]|*-*-darwin[3-8].*) have_unwind_getipinfo=no ;;
+      *-*-darwin9*|*-*-darwin9.*)
+        AC_LANG_SAVE
+        AC_LANG_CPLUSPLUS
+        ac_save_CXXFLAGS="$CXXFLAGS"
+        CXXFLAGS="$CXXFLAGS -fno-exceptions"
+        AC_MSG_CHECKING([for _Unwind_GetIPInfo])
+        AC_CACHE_VAL(gcc_cv_getipinfo, [
+        AC_TRY_COMPILE([, [_Unwind_GetIPInfo();],
+      [gcc_cv_getipinfo=yes],
+          [gcc_cv_getipinfo=no])
+        ])
+      ])
+      CXXFLAGS="$ac_save_CXXFLAGS"
+      AC_LANG_RESTORE
+      ;;
       *) have_unwind_getipinfo=yes ;;
     esac
     changequote([,])

produces the autoconf error...

# autoconf -I../config -I.
/sw/bin/m4:configure.ac:130: recursion limit of 1024 exceeded, use -L<N> to
change it
autom4te-2.64: /sw/bin/m4 failed with exit status: 1

[Bug target/55061] libbacktrace build fails during bootstrap on powerpc-apple-darwin9

[ian at airs dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55061

--- Comment #16 from Ian Lance Taylor <ian at airs dot com> 2012-10-25 17:37:10 UTC ---
I think you may be looking at the wrong thing.  The libbacktrace configure.ac
only uses GCC_CHECK_UNWIND_GETIPINFO when it is built as a target library.  You
are seeing a failure when building it as a host library.  I don't think that
changing config/unwind_ipinfo.m4 is going to make any difference for the
failure that you are seeing.

[Bug target/55061] libbacktrace build fails during bootstrap on powerpc-apple-darwin9

[ian at airs dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55061

--- Comment #17 from Ian Lance Taylor <ian at airs dot com> 2012-10-25 17:41:26 UTC ---
Thanks for attaching the config.log.  The config.log suggests that this
program:

int
main ()
{
  return _Unwind_GetIPInfo ();
}

both compiles and links when using GCC 4.0.1 on Darwin.  That would be a
surprising result, as it does not link when using the FSF GCC 4.0.1:
_Unwind_GetIPInfo is undefined.  Apparently with GCC 4.0.1 on Darwin
_Unwind_GetIPInfo is defined somewhere.

Can you verify that?  If that is correct, then the configure script needs to
check not only that _Unwind_GetIPInfo is available at link time, but also that
it is declared in unwind.h.

[Bug target/55061] libbacktrace build fails during bootstrap on powerpc-apple-darwin9

[howarth at nitro dot med.uc.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55061

--- Comment #18 from Jack Howarth <howarth at nitro dot med.uc.edu> 2012-10-25 17:56:54 UTC ---
(In reply to comment #17)
Are you sure? I see...

if test -n "${with_target_subdir}"; then
  GCC_CHECK_UNWIND_GETIPINFO
else
  AC_CHECK_FUNC(_Unwind_GetIPInfo, [have_unwind_getipinfo=yes],
                [have_unwind_getipinfo=no])
  if test "$have_unwind_getipinfo" = "yes"; then
    AC_DEFINE(HAVE_GETIPINFO, 1, [Define if _Unwind_GetIPInfo is available.])
  fi
fi

in libbacktrace/configure.ac and it seems that GCC_CHECK_UNWIND_GETIPINFO is
only defined in config/unwind_ipinfo.m4. If so this is no longer a compile or
link test but decided by target only (see r141804).

[Bug target/55061] libbacktrace build fails during bootstrap on powerpc-apple-darwin9

[ian at airs dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55061

--- Comment #19 from Ian Lance Taylor <ian at airs dot com> 2012-10-25 18:55:25 UTC ---
Yes, I'm sure, because

test -n "${with_target_subdir}"

is true exactly when libbacktrace is being built as a target library.  That
test will not be true when libbacktrace is being built as a host library.  And
the failure you are reporting is with building libbacktrace in stage 1, when it
is being built as a host library.

[Bug target/55061] libbacktrace build fails during bootstrap on powerpc-apple-darwin9

[howarth at nitro dot med.uc.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55061

--- Comment #20 from Jack Howarth <howarth at nitro dot med.uc.edu> 2012-10-25 19:38:07 UTC ---
This testcase should work for powerpc-apple-darwin9...

----------------------------------------------------
#include "unwind.h"

int
main()
{
  struct _Unwind_Context *context;
  int ip_before_insn = 0;  

   return _Unwind_GetIPInfo (context, &ip_before_insn); 
}
----------------------------------------------------
It produces...

$ gcc -Werror-implicit-function-declaration  -c test.c
test.c: In function 'main':
test.c:9: error: implicit declaration of function '_Unwind_GetIPInfo'

and

$ gcc-4.2 -Werror-implicit-function-declaration  -c test.c
$

[Bug target/55061] libbacktrace build fails during bootstrap on powerpc-apple-darwin9

[howarth at nitro dot med.uc.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55061

--- Comment #21 from Jack Howarth <howarth at nitro dot med.uc.edu> 2012-10-25 19:57:29 UTC ---
FYI the test in Comment 20 passes for llvm-gcc-4.2 and clang in Xcode 4.5.1 but
only for gcc-4.2 and llvm-gcc-4.2 in Xcode 4.2. The clang in Xcode 4.2
apparently doesn't provide the unwind.h header yet...

% clang -Werror-implicit-function-declaration -c test.c
test.c:1:10: fatal error: 'unwind.h' file not found
#include "unwind.h"
         ^
1 error generated.

[Bug target/55061] libbacktrace build fails during bootstrap on powerpc-apple-darwin9

[howarth at nitro dot med.uc.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55061

--- Comment #22 from Jack Howarth <howarth at nitro dot med.uc.edu> 2012-10-25 22:34:38 UTC ---
Created attachment 28532
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=28532
proposed patch to check for _Unwind_GetIPInfo function declaration

[Bug target/55061] libbacktrace build fails during bootstrap on powerpc-apple-darwin9

[howarth at nitro dot med.uc.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55061

--- Comment #23 from Jack Howarth <howarth at nitro dot med.uc.edu> 2012-10-25 23:08:50 UTC ---
(In reply to comment #22)
> Created attachment 28532 [details]
> proposed patch to check for _Unwind_GetIPInfo function declaration

Patch tested on powerpc-apple-darwin9 with gcc 4.0.1 which results in
HAVE_GETIPINFO being left unset and with gcc 4.2.1 which results in
HAVE_GETIPINFO being set in config.h. Also tested on x86_64 Fedora 15 which
also results in HAVE_GETIPINFO being set. Also note that for gcc 4.0.1 on
powerpc-apple-darwin9, while libbacktrace in stage 1 has HAVE_GETIPINFO unset,
it is set properly in stage2 when building against the stage 1 compiler. Also
tested on x86_64-apple-darwin11 with clang from Xcode 4.5.1 which properly
defines HAVE_GETIPINFO during stage 1.

[Bug target/55061] libbacktrace build fails during bootstrap on powerpc-apple-darwin9

[ian at airs dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55061

--- Comment #24 from Ian Lance Taylor <ian at airs dot com> 2012-10-25 23:51:00 UTC ---
The patch in comment #22 is OK with a ChangeLog entry.

Thanks.

[Bug target/55061] libbacktrace build fails during bootstrap on powerpc-apple-darwin9

[howarth at nitro dot med.uc.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55061

--- Comment #25 from Jack Howarth <howarth at nitro dot med.uc.edu> 2012-10-26 03:30:44 UTC ---
Patch posted at http://gcc.gnu.org/ml/gcc-patches/2012-10/msg02362.html.

[Bug target/55061] libbacktrace build fails during bootstrap on powerpc-apple-darwin9

[ian at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55061

--- Comment #26 from ian at gcc dot gnu.org <ian at gcc dot gnu.org> 2012-10-26 17:35:04 UTC ---
Author: ian
Date: Fri Oct 26 17:34:59 2012
New Revision: 192853

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=192853
Log:
    PR target/55061
    * configure.ac: Check for _Unwind_GetIPInfo function declaration.
    * configure: Regenerate.

Modified:
    trunk/libbacktrace/ChangeLog
    trunk/libbacktrace/configure
    trunk/libbacktrace/configure.ac

[Bug target/55061] libbacktrace build fails during bootstrap on powerpc-apple-darwin9

[ian at airs dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55061

Ian Lance Taylor <ian at airs dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |FIXED

--- Comment #27 from Ian Lance Taylor <ian at airs dot com> 2012-10-26 17:52:06 UTC ---
This time for sure.