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re PR middle-end/46790 (EH failures in libstdc++ testsuite with --gc-sections and GNU ld 2.18) 

PR middle-end/46790
	* configure.ac (HAVE_LD_EH_GC_SECTIONS_BUG): New test.
	* configure: Regenerated.
	* config.in: Regenerated.
	* varasm.c (default_function_section): Return NULL
	if HAVE_LD_EH_GC_SECTIONS_BUG and decl has implicit
	section name.

From-SVN: r170565
This commit is contained in:
Jakub Jelinek 2011-02-28 16:36:37 +01:00 committed by Jakub Jelinek
parent 68ade9e4e8
commit 1b50097624
5 changed files with 118 additions and 0 deletions
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10
gcc/ChangeLog
View File

@ -1,3 +1,13 @@
2011-02-28 Jakub Jelinek <jakub@redhat.com>
PR middle-end/46790
* configure.ac (HAVE_LD_EH_GC_SECTIONS_BUG): New test.
* configure: Regenerated.
* config.in: Regenerated.
* varasm.c (default_function_section): Return NULL
if HAVE_LD_EH_GC_SECTIONS_BUG and decl has implicit
section name.
2011-02-28 Martin Jambor <mjambor@suse.cz>
* ipa-inline.c (cgraph_decide_inlining_of_small_functions): Fix

7
gcc/config.in
View File

@ -1171,6 +1171,13 @@
#endif
/* Define if your linker has buggy garbage collection of sections support when
.text.startup.foo like sections are used. */
#ifndef USED_FOR_TARGET
#undef HAVE_LD_EH_GC_SECTIONS_BUG
#endif
/* Define if your PowerPC64 linker supports a large TOC. */
#ifndef USED_FOR_TARGET
#undef HAVE_LD_LARGE_TOC

47
gcc/configure vendored
View File

@ -25445,6 +25445,53 @@ fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $gcc_cv_ld_eh_gc_sections" >&5
$as_echo "$gcc_cv_ld_eh_gc_sections" >&6; }
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking linker EH garbage collection of sections bug" >&5
$as_echo_n "checking linker EH garbage collection of sections bug... " >&6; }
gcc_cv_ld_eh_gc_sections_bug=no
if test $in_tree_ld = yes ; then
if test "$gcc_cv_gld_major_version" -eq 2 -a "$gcc_cv_gld_minor_version" -lt 19 -o "$gcc_cv_gld_major_version" -lt 2 \
&& test $in_tree_ld_is_elf = yes; then
gcc_cv_ld_eh_gc_sections_bug=yes
fi
elif test x$gcc_cv_as != x -a x$gcc_cv_ld != x -a x$gcc_cv_objdump != x -a x$gcc_cv_as_comdat_group = xyes; then
gcc_cv_ld_eh_gc_sections_bug=yes
cat > conftest.s <<EOF
.section .text
.globl _start
.type _start, @function
_start:
.long foo
.size _start, .-_start
.section .text.startup.foo,"ax",@progbits
.type foo, @function
foo:
.long 0
.size foo, .-foo
.section .gcc_except_table.foo,"a",@progbits
.L0:
.long 0
.section .eh_frame,"a",@progbits
.long .L0
EOF
if $gcc_cv_as -o conftest.o conftest.s > /dev/null 2>&1; then
if $gcc_cv_ld -o conftest conftest.o --entry=_start --gc-sections 2>&1 \
| grep "gc-sections option ignored" > /dev/null; then
:
elif $gcc_cv_objdump -h conftest 2> /dev/null \
| grep gcc_except_table > /dev/null; then
gcc_cv_ld_eh_gc_sections_bug=no
fi
fi
rm -f conftest.s conftest.o conftest
fi
if test x$gcc_cv_ld_eh_gc_sections_bug = xyes; then
$as_echo "#define HAVE_LD_EH_GC_SECTIONS_BUG 1" >>confdefs.h
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $gcc_cv_ld_eh_gc_sections_bug" >&5
$as_echo "$gcc_cv_ld_eh_gc_sections_bug" >&6; }
# --------
# UNSORTED
# --------

45
gcc/configure.ac
View File

@ -4097,6 +4097,51 @@ if test x$gcc_cv_ld_eh_gc_sections = xyes; then
fi
AC_MSG_RESULT($gcc_cv_ld_eh_gc_sections)
AC_MSG_CHECKING(linker EH garbage collection of sections bug)
gcc_cv_ld_eh_gc_sections_bug=no
if test $in_tree_ld = yes ; then
if test "$gcc_cv_gld_major_version" -eq 2 -a "$gcc_cv_gld_minor_version" -lt 19 -o "$gcc_cv_gld_major_version" -lt 2 \
&& test $in_tree_ld_is_elf = yes; then
gcc_cv_ld_eh_gc_sections_bug=yes
fi
elif test x$gcc_cv_as != x -a x$gcc_cv_ld != x -a x$gcc_cv_objdump != x -a x$gcc_cv_as_comdat_group = xyes; then
gcc_cv_ld_eh_gc_sections_bug=yes
cat > conftest.s <<EOF
.section .text
.globl _start
.type _start, @function
_start:
.long foo
.size _start, .-_start
.section .text.startup.foo,"ax",@progbits
.type foo, @function
foo:
.long 0
.size foo, .-foo
.section .gcc_except_table.foo,"a",@progbits
.L0:
.long 0
.section .eh_frame,"a",@progbits
.long .L0
EOF
if $gcc_cv_as -o conftest.o conftest.s > /dev/null 2>&1; then
if $gcc_cv_ld -o conftest conftest.o --entry=_start --gc-sections 2>&1 \
| grep "gc-sections option ignored" > /dev/null; then
:
elif $gcc_cv_objdump -h conftest 2> /dev/null \
| grep gcc_except_table > /dev/null; then
gcc_cv_ld_eh_gc_sections_bug=no
fi
fi
rm -f conftest.s conftest.o conftest
fi
if test x$gcc_cv_ld_eh_gc_sections_bug = xyes; then
AC_DEFINE(HAVE_LD_EH_GC_SECTIONS_BUG, 1,
[Define if your linker has buggy garbage collection of
sections support when .text.startup.foo like sections are used.])
fi
AC_MSG_RESULT($gcc_cv_ld_eh_gc_sections_bug)
# --------
# UNSORTED
# --------

9
gcc/varasm.c
View File

@ -554,6 +554,15 @@ section *
default_function_section (tree decl, enum node_frequency freq,
bool startup, bool exit)
{
#if defined HAVE_LD_EH_GC_SECTIONS && defined HAVE_LD_EH_GC_SECTIONS_BUG
/* Old GNU linkers have buggy --gc-section support, which sometimes
results in .gcc_except_table* sections being garbage collected. */
if (decl
&& DECL_SECTION_NAME (decl)
&& DECL_HAS_IMPLICIT_SECTION_NAME_P (decl))
return NULL;
#endif
if (!flag_reorder_functions
|| !targetm.have_named_sections)
return NULL;