As mentioned in
http://gcc.gnu.org/ml/gcc-patches/2012-08/msg01364.html
GCC now is performing optimizations in binds_local_p() that
necessitates adding -fPIC when compiling objects for shared libraries
on AIX. The libtool patch has been accepted upstream.
-fPIC creates unique names for some weak symbols, causing spurious
miscompares addressed by the patch to top-level configure.ac. The
libquadmath patch is another patch waiting for approval.
How do the requirements to regenerate configure interact with the
shared, top-level directories? The only strange difference I saw in
GCC was the libatomic subdirectory, which had differences for AMTAR
although the same version of autoconf.
Bootstrapped and regression tested on powerpc-ibm-aix5.3.0.0 and
powerpc-ibm-aix7.1.0.0.
Thanks, David
Merge upstream change.
* libtool.m4 (_LT_COMPILER_PIC): Add -fPIC to GCC and GXX for AIX.
* configure.ac: Add target-libquadmath to noconfigdirs for AIX.
Add libgomp*.o to compare_exclusions for AIX.
* configure: Regenerate
* */configure: Regenerate
Index: libtool.m4
===================================================================
--- libtool.m4 (revision 191073)
+++ libtool.m4 (working copy)
@@ -3580,6 +3580,7 @@
# AIX 5 now supports IA64 processor
_LT_TAGVAR(lt_prog_compiler_static, $1)='-Bstatic'
fi
+ _LT_TAGVAR(lt_prog_compiler_pic, $1)='-fPIC'
;;
amigaos*)
@@ -3891,6 +3892,7 @@
# AIX 5 now supports IA64 processor
_LT_TAGVAR(lt_prog_compiler_static, $1)='-Bstatic'
fi
+ _LT_TAGVAR(lt_prog_compiler_pic, $1)='-fPIC'
;;
amigaos*)
Index: configure.ac
===================================================================
--- configure.ac (revision 191073)
+++ configure.ac (working copy)
@@ -527,6 +527,15 @@
fi
fi
+# Disable libquadmath for some systems.
+case "${target}" in
+ # libquadmath is unused on AIX and libquadmath build process use of
+ # LD_LIBRARY_PATH can break AIX bootstrap.
+ powerpc-*-aix* | rs6000-*-aix*)
+ noconfigdirs="$noconfigdirs target-libquadmath"
+ ;;
+esac
+
# Disable libssp for some systems.
case "${target}" in
avr-*-*)
@@ -3187,6 +3196,7 @@
case "$target" in
hppa*64*-*-hpux*) ;;
hppa*-*-hpux*) compare_exclusions="gcc/cc*-checksum\$(objext) | */libgcc/lib\
2funcs* | gcc/ada/*tools/*" ;;
+ powerpc*-ibm-aix*) compare_exclusions="gcc/cc*-checksum\$(objext) | gcc/ada/\
*tools/* | *libgomp*\$(objext)" ;;
esac
AC_SUBST(compare_exclusions)
