[gcc(refs/vendors/ARM/heads/arm-struct-reorg-wip)] libbacktrace: test linker support for DWARF 5

[Tamar Christina]

https://gcc.gnu.org/g:f887a36851af1910145fc63ac67757b5175c535e

commit f887a36851af1910145fc63ac67757b5175c535e
Author: Ian Lance Taylor <iant@golang.org>
Date:   Tue Jul 7 20:42:21 2020 -0700

    libbacktrace: test linker support for DWARF 5
    
    On AIX, the compiler supports DWARF 5 but the linker does not.
    
    2020-07-07 Clement Chigot <clement.chigot@atos.net>
    
            * configure.ac: Test linker support for DWARF5
            * configure: Regenerate

Diff:
---
 libbacktrace/configure    | 12 ++++++++++--
 libbacktrace/configure.ac |  4 ++--
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/libbacktrace/configure b/libbacktrace/configure
index 676adb89224..28b9593342a 100755
--- a/libbacktrace/configure
+++ b/libbacktrace/configure
@@ -13292,13 +13292,21 @@ CFLAGS="$CFLAGS -gdwarf-5"
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 int i;
+int
+main ()
+{
+return 0;
+  ;
+  return 0;
+}
 _ACEOF
-if ac_fn_c_try_compile "$LINENO"; then :
+if ac_fn_c_try_link "$LINENO"; then :
   libbacktrace_cv_lib_dwarf5=yes
 else
   libbacktrace_cv_lib_dwarf5=no
 fi
-rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
 CFLAGS=$CFLAGS_hold
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $libbacktrace_cv_lib_dwarf5" >&5
diff --git a/libbacktrace/configure.ac b/libbacktrace/configure.ac
index 3730d7c4b06..afdd30774d0 100644
--- a/libbacktrace/configure.ac
+++ b/libbacktrace/configure.ac
@@ -420,12 +420,12 @@ AC_SUBST(PTHREAD_CFLAGS)
 
 AM_CONDITIONAL(HAVE_PTHREAD, test "$libgo_cv_lib_pthread" = yes)
 
-dnl Test whether the compiler supports the -gdwarf-5 option.
+dnl Test whether the compiler and the linker support the -gdwarf-5 option.
 AC_CACHE_CHECK([whether -gdwarf-5 is supported],
 [libbacktrace_cv_lib_dwarf5],
 [CFLAGS_hold=$CFLAGS
 CFLAGS="$CFLAGS -gdwarf-5"
-AC_COMPILE_IFELSE([AC_LANG_SOURCE([int i;])],
+AC_LINK_IFELSE([AC_LANG_PROGRAM([int i;], [return 0;])],
 [libbacktrace_cv_lib_dwarf5=yes],
 [libbacktrace_cv_lib_dwarf5=no])
 CFLAGS=$CFLAGS_hold])