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[Emacs-diffs] master c6e93df: Pre-4.6 GCC succeeds with unknown option
From: |
Paul Eggert |
Subject: |
[Emacs-diffs] master c6e93df: Pre-4.6 GCC succeeds with unknown option |
Date: |
Thu, 16 Apr 2015 07:14:46 +0000 |
branch: master
commit c6e93df20266fe9f8517f14f3b7c367281f988a5
Author: Paul Eggert <address@hidden>
Commit: Paul Eggert <address@hidden>
Pre-4.6 GCC succeeds with unknown option
* configure.ac (emacs_cv_prog_cc_nopie): Port to pre-4.6 GCC.
Fixes: bug#20338
---
configure.ac | 11 ++++++-----
1 files changed, 6 insertions(+), 5 deletions(-)
diff --git a/configure.ac b/configure.ac
index c35e962..39f3f9f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -5021,18 +5021,19 @@ esac
# -nopie fixes a temacs segfault on Gentoo, OpenBSD, and other systems
# with "hardened" GCC configurations for some reason (Bug#18784).
# We don't know why -nopie works, but not segfaulting is better than
-# segfaulting. Use -Werror when trying -nopie, otherwise clang keeps
-# warning that it does not understand -nopie.
+# segfaulting. Use ac_c_werror_flag=yes when trying -nopie, otherwise
+# clang keeps warning that it does not understand -nopie, and pre-4.6
+# GCC has a similar problem (Bug#20338).
AC_CACHE_CHECK([whether $CC accepts -nopie],
[emacs_cv_prog_cc_nopie],
- [emacs_save_CFLAGS=$CFLAGS
+ [emacs_save_c_werror_flag=$ac_c_werror_flag
emacs_save_LDFLAGS=$LDFLAGS
- CFLAGS="$CFLAGS -Werror"
+ ac_c_werror_flag=yes
LDFLAGS="$LDFLAGS -nopie"
AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
[emacs_cv_prog_cc_nopie=yes],
[emacs_cv_prog_cc_nopie=no])
- CFLAGS=$emacs_save_CFLAGS
+ ac_c_werror_flag=$emacs_save_c_werror_flag
LDFLAGS=$emacs_save_LDFLAGS])
if test "$emacs_cv_prog_cc_nopie" = yes; then
LD_SWITCH_SYSTEM_TEMACS="$LD_SWITCH_SYSTEM_TEMACS -nopie"
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