[gcc r14-357] gcc: Use ld -r when checking for HAVE_LD_RO_RW_SECTION_MIXING

[gcc r14-357] gcc: Use ld -r when checking for HAVE_LD_RO_RW_SECTION_MIXING

[Jeff Law]

https://gcc.gnu.org/g:2744dbb9ecf104a113da3a0f39115da4653bb676

commit r14-357-g2744dbb9ecf104a113da3a0f39115da4653bb676
Author: Joakim Nohlgård <joakim@nohlgard.se>
Date:   Sun Apr 30 10:34:26 2023 -0600

    gcc: Use ld -r when checking for HAVE_LD_RO_RW_SECTION_MIXING
    
    Fall back to ld -r if ld -shared fails during configure. The check for
    HAVE_LD_RO_RW_SECTION_MIXING can fail 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 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

Diff:
---
 gcc/configure    | 23 +++++++++++++----------
 gcc/configure.ac | 23 +++++++++++++----------
 2 files changed, 26 insertions(+), 20 deletions(-)

diff --git a/gcc/configure b/gcc/configure
index c7b26d1927d..cdc7358a56b 100755
--- a/gcc/configure
+++ b/gcc/configure
@@ -24391,16 +24391,19 @@ elif test x$gcc_cv_as != x -a x$gcc_cv_ld != x -a x$gcc_cv_objdump != x ; then
   echo '.byte 0' >> conftest3.s
   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 \
-     && $gcc_cv_ld -shared -o conftest1.so conftest1.o \
-	conftest2.o conftest3.o > /dev/null 2>&1; then
-    gcc_cv_ld_ro_rw_mix=`$gcc_cv_objdump -h conftest1.so \
-			 | 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
-	gcc_cv_ld_ro_rw_mix=read-only
-      else
-	gcc_cv_ld_ro_rw_mix=read-write
+     && $gcc_cv_as -o conftest3.o conftest3.s > /dev/null 2>&1; then
+    if $gcc_cv_ld -shared -o conftest1.so conftest1.o \
+       conftest2.o conftest3.o > /dev/null 2>&1 \
+       || $gcc_cv_ld -r -o conftest1.so conftest1.o \
+	  conftest2.o conftest3.o > /dev/null 2>&1; then
+      gcc_cv_ld_ro_rw_mix=`$gcc_cv_objdump -h conftest1.so \
+			   | 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
+	  gcc_cv_ld_ro_rw_mix=read-only
+	else
+	  gcc_cv_ld_ro_rw_mix=read-write
+	fi
       fi
     fi
   fi
diff --git a/gcc/configure.ac b/gcc/configure.ac
index 09082e8ccae..73ff7c23c63 100644
--- a/gcc/configure.ac
+++ b/gcc/configure.ac
@@ -3187,16 +3187,19 @@ elif test x$gcc_cv_as != x -a x$gcc_cv_ld != x -a x$gcc_cv_objdump != x ; then
   echo '.byte 0' >> conftest3.s
   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 \
-     && $gcc_cv_ld -shared -o conftest1.so conftest1.o \
-	conftest2.o conftest3.o > /dev/null 2>&1; then
-    gcc_cv_ld_ro_rw_mix=`$gcc_cv_objdump -h conftest1.so \
-			 | 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
-	gcc_cv_ld_ro_rw_mix=read-only
-      else
-	gcc_cv_ld_ro_rw_mix=read-write
+     && $gcc_cv_as -o conftest3.o conftest3.s > /dev/null 2>&1; then
+    if $gcc_cv_ld -shared -o conftest1.so conftest1.o \
+       conftest2.o conftest3.o > /dev/null 2>&1 \
+       || $gcc_cv_ld -r -o conftest1.so conftest1.o \
+	  conftest2.o conftest3.o > /dev/null 2>&1; then
+      gcc_cv_ld_ro_rw_mix=`$gcc_cv_objdump -h conftest1.so \
+			   | 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
+	  gcc_cv_ld_ro_rw_mix=read-only
+	else
+	  gcc_cv_ld_ro_rw_mix=read-write
+	fi
       fi
     fi
   fi