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authorrubidium <rubidium@openttd.org>2007-08-04 00:45:53 +0000
committerrubidium <rubidium@openttd.org>2007-08-04 00:45:53 +0000
commit80a5676783ae982b0b0be2908ea8e6bfb4c5dd6c (patch)
tree2c7efe202fe2fc2868c03e722aa5e4435614f4d9
parent930bb8424231c4d11aa838f737ef5a7f2bc27db2 (diff)
downloadopenttd-80a5676783ae982b0b0be2908ea8e6bfb4c5dd6c.tar.xz
(svn r10779) -Fix: GCC 4.2 makes (by default for -O2, -O3 and -Os) an assumption that signed integers do not overflow, whereas it is very likely that some of the legacy code does so. It furthermore breaks with the assumed standard (the behaviour is not actually defined in the standard) about the behaviour when signed integers wrap.
-rw-r--r--config.lib8
1 files changed, 8 insertions, 0 deletions
diff --git a/config.lib b/config.lib
index e84f48d91..e814df7ef 100644
--- a/config.lib
+++ b/config.lib
@@ -838,6 +838,14 @@ make_cflags_and_ldflags() {
CFLAGS="$CFLAGS -fno-strict-aliasing"
fi
+ # GCC 4.2+ automatically assumes that signed overflows do
+ # not occur in signed arithmetics, whereas we are not
+ # sure that they will not happen. It furthermore complains
+ # about it's own optimized code in some places.
+ if [ $cc_version -ge 42 ]; then
+ CFLAGS="$CFLAGS -fno-strict-overflow"
+ fi
+
if [ "$os" != "CYGWIN" ] && [ "$os" != "FREEBSD" ] && [ "$os" != "OPENBSD" ] && [ "$os" != "MINGW" ] && [ "$os" != "MORPHOS" ] && [ "$os" != "OSX" ] && [ "$os" != "WINCE" ] && [ "$os" != "PSP" ] && [ "$os" != "OS2" ]; then
LIBS="$LIBS -lpthread"
LIBS="$LIBS -lrt"