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authorLudovic Courtès <ludo@gnu.org>2012-01-27 22:02:31 +0100
committerLudovic Courtès <ludo@gnu.org>2012-01-27 22:02:31 +0100
commitf5ea0499a411309014475dc7f7983e827f431af2 (patch)
tree32b9344266e568e8c416d0f344cc732c392b7ac5
parent04b2d773548c57b6eadd1808a8d15cce47af9630 (diff)
downloadguile-f5ea0499a411309014475dc7f7983e827f431af2.tar.gz
Build with `-fno-strict-aliasing' when available.
* configure.ac (POTENTIAL_GCC_CFLAGS): Add `-fno-strict-aliasing'. Suggested by Mark H. Weaver.
-rw-r--r--configure.ac7
1 files changed, 6 insertions, 1 deletions
diff --git a/configure.ac b/configure.ac
index 04553755b..ccc5fa572 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1527,9 +1527,14 @@ case "$GCC" in
## and it became equally exasperating (gcc 2.95 and/or glibc 2.1.2).
## -Wundef was removed because Gnulib prevented it (see
## <http://thread.gmane.org/gmane.lisp.guile.bugs/5329>.)
+
+ ## Build with `-fno-strict-aliasing' to prevent miscompilation on
+ ## some platforms. See
+ ## <http://lists.gnu.org/archive/html/guile-devel/2012-01/msg00487.html>.
+
POTENTIAL_GCC_CFLAGS="-Wall -Wmissing-prototypes \
-Wdeclaration-after-statement \
- -Wswitch-enum"
+ -Wswitch-enum -fno-strict-aliasing"
# Do this here so we don't screw up any of the tests above that might
# not be "warning free"
if test "${GUILE_ERROR_ON_WARNING}" = yes