Description:
On AIX, the compiler is able to handle DWARF-5 but not the linker.
Changelog:
2020-07-07 Clement Chigot <clement.chi...@atos.net>
* configure.ac: Extend check to the linker for DWARF-5 support
* configure: Regenerate
Please apply for me if approved.
Could it be backported in gcc-10 branch too, please ?
Thanks,
Clément
From 35f784cf22b9f5432c805782d12177189ec68dda Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Cl=C3=A9ment=20Chigot?= <clement.chi...@atos.net>
Date: Wed, 10 Jun 2020 14:37:03 -0500
Subject: [PATCH] libbacktrace: configure check linker support for DWARF-5
On AIX, the compiler is able to handle DWARF-5 but not the linker.
Changelog:
2020-07-07 Clement Chigot <clement.chi...@atos.net>
* configure.ac: Extend check to the linker for DWARF-5 support
* configure: Regenerate
---
libbacktrace/configure | 7 ++++---
libbacktrace/configure.ac | 4 ++--
2 files changed, 6 insertions(+), 5 deletions(-)
diff --git a/libbacktrace/configure b/libbacktrace/configure
index b453bae5ae6..8149b7c6508 100755
--- a/libbacktrace/configure
+++ b/libbacktrace/configure
@@ -13577,14 +13577,15 @@ else
CFLAGS="$CFLAGS -gdwarf-5"
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
-int i;
+int main(){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: $libbacktrace_cv_lib_dwarf5" >&5
diff --git a/libbacktrace/configure.ac b/libbacktrace/configure.ac
index bd16f20fd0e..21feaf36294 100644
--- a/libbacktrace/configure.ac
+++ b/libbacktrace/configure.ac
@@ -465,12 +465,12 @@ AC_SUBST(PTHREAD_CFLAGS)
AM_CONDITIONAL(HAVE_PTHREAD, test "$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_SOURCE([int main(){return 0;}])],
[libbacktrace_cv_lib_dwarf5=yes],
[libbacktrace_cv_lib_dwarf5=no])
CFLAGS=$CFLAGS_hold])
--
2.25.0
