From e9d207d9ac31509bbf6db4035b3784c74b47d669 Mon Sep 17 00:00:00 2001
From: Eric Botcazou <ebotcazou@adacore.com>
Date: Thu, 21 Dec 2006 22:10:30 +0000
Subject: re PR other/29639 (ext/bitmap_allocator/check_allocate_max_size.cc
 execution test)

	PR other/29639
	* configure.ac (HAVE_LD_EH_GC_SECTIONS): Check that exception tables
	are kept for .gnu.linkonce.t sections if COMDAT groups are disabled.
	* configure: Regenerate.

From-SVN: r120121
---
 gcc/configure | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

(limited to 'gcc/configure')

diff --git a/gcc/configure b/gcc/configure
index 62e4891..09fc0aa 100755
--- a/gcc/configure
+++ b/gcc/configure
@@ -16053,10 +16053,46 @@ EOF
       gcc_cv_ld_eh_gc_sections=no
     elif $gcc_cv_objdump -h conftest | grep gcc_except_table > /dev/null; then
       gcc_cv_ld_eh_gc_sections=yes
+      # If no COMDAT groups, the compiler will emit .gnu.linkonce.t. sections.
+      if test x$gcc_cv_as_comdat_group != xyes; then
+	gcc_cv_ld_eh_gc_sections=no
+	cat > conftest.s <<EOF
+	.section	.text
+.globl _start
+        .type _start, @function
+_start:
+	.long foo
+	.size _start, .-_start
+	.section	.gnu.linkonce.t.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
+	    gcc_cv_ld_eh_gc_sections=no
+	  elif $gcc_cv_objdump -h conftest | grep gcc_except_table > /dev/null; then
+	    gcc_cv_ld_eh_gc_sections=yes
+	  fi
+	fi
+      fi
     fi
   fi
   rm -f conftest.s conftest.o conftest
 fi
+case "$target" in
+  hppa*-*-linux*)
+    # ??? This apparently exposes a binutils bug with PC-relative relocations.
+    gcc_cv_ld_eh_gc_sections=no
+    ;;
+esac
 if test x$gcc_cv_ld_eh_gc_sections = xyes; then
 
 cat >>confdefs.h <<\_ACEOF
-- 
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