dave/openttd
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Use builtins for overflow detection in OverflowSafeInt on gcc/clang

Browse Source
This commit is contained in:
Jonathan G Rennison
2020-04-20 21:48:04 +01:00
parent be3f03358f
commit 6821c0e945
2 changed files with 47 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

23
config.lib
View File

@@ -1914,6 +1914,29 @@ EOL
CFLAGS="$CFLAGS -DWITH_BITMATH_BUILTINS"
fi
log 2 "executing $cc_host $CFLAGS $LDFLAGS $STATIC_FLAGS -o tmp.config.overflow-builtins -x c++ -"
"$cc_host" $CFLAGS $LDFLAGS $STATIC_FLAGS -o tmp.config.overflow-builtins -x c++ - 2> /dev/null << EOL
#include <cstdint>
int main() {
int64_t a = 0;
int64_t b = 0;
int64_t c = 0;
bool res1 = __builtin_add_overflow(a, b, &c);
bool res2 = __builtin_sub_overflow(a, b, &c);
bool res3 = __builtin_mul_overflow(a, b, &c);
return (res1 || res2 || res3) ? 1 : 0;
}
EOL
ret=$?
rm -f tmp.config.overflow-builtins
log 2 " exit code $ret"
if [ $ret -ne 0 ]; then
log 1 "checking overflow builtins... no"
else
log 1 "checking overflow builtins... found"
CFLAGS="$CFLAGS -DWITH_OVERFLOW_BUILTINS"
fi
if [ "$os" != "CYGWIN" ] && [ "$os" != "HAIKU" ] && [ "$os" != "MORPHOS" ] && [ "$os" != "OSX" ] && [ "$os" != "DOS" ] && [ "$os" != "WINCE" ] && [ "$os" != "PSP" ] && [ "$os" != "OS2" ]; then
log 2 "executing $cc_host $CFLAGS $CFLAGS_ENV $LDFLAGS $LDFLAGS_ENV -o tmp.config.demangle -x c++ - -lstdc++"
"$cc_host" $CFLAGS $CFLAGS_ENV $LDFLAGS $LDFLAGS_ENV -o tmp.config.demangle -x c++ - -lstdc++ 2> /dev/null << EOL