[PATCH] gcc: Use ld -r when checking for HAVE_LD_RO_RW_SECTION_MIXING

["Joakim Nohlgård" <joakim@nohlgard.se>]

The check for HAVE_LD_RO_RW_SECTION_MIXING fails on targets where ld
does not support shared objects, even though the answer to the test
should be 'read-write'. One such target is riscv64-unknown-elf. Failing
this test results in a libgcc crtbegin.o which has a writable .eh_frame
section leading to the default linker scripts placing the .eh_frame
section in a writable memory segment, or a linker warning about writable
sections in a read-only segment when using ld scripts that place
.eh_frame unconditionally in ROM.

gcc/ChangeLog:

	* configure: Regenerate.
	* configure.ac: Use ld -r in the check for HAVE_LD_RO_RW_SECTION_MIXING

Signed-off-by: Joakim Nohlgård <joakim@nohlgard.se>
---
 gcc/configure.ac | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/gcc/configure.ac b/gcc/configure.ac
index 7c55bff6cb0..4f36ed4aff3 100644
--- a/gcc/configure.ac
+++ b/gcc/configure.ac
@@ -3153,9 +3153,9 @@ elif test x$gcc_cv_as != x -a x$gcc_cv_ld != x -a x$gcc_cv_objdump != x ; then
   if $gcc_cv_as -o conftest1.o conftest1.s > /dev/null 2>&1 \
      && $gcc_cv_as -o conftest2.o conftest2.s > /dev/null 2>&1 \
      && $gcc_cv_as -o conftest3.o conftest3.s > /dev/null 2>&1 \
-     && $gcc_cv_ld -shared -o conftest1.so conftest1.o \
+     && $gcc_cv_ld -r -o conftest.o conftest1.o \
 	conftest2.o conftest3.o > /dev/null 2>&1; then
-    gcc_cv_ld_ro_rw_mix=`$gcc_cv_objdump -h conftest1.so \
+    gcc_cv_ld_ro_rw_mix=`$gcc_cv_objdump -h conftest.o \
 			 | sed -e '/myfoosect/!d' -e N`
     if echo "$gcc_cv_ld_ro_rw_mix" | grep CONTENTS > /dev/null; then
       if echo "$gcc_cv_ld_ro_rw_mix" | grep READONLY > /dev/null; then
-- 
2.38.1