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Disable -fsanitize=function on Clang 17 #12642

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Disable -fsanitize=function on Clang 17 #12642

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17 changes: 17 additions & 0 deletions configure.ac
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Original file line number Diff line number Diff line change
Expand Up @@ -1534,6 +1534,23 @@ if test "$PHP_UNDEFINED_SANITIZER" = "yes"; then
AX_CHECK_COMPILE_FLAG([-fsanitize=undefined], [
CFLAGS="$CFLAGS -fsanitize=undefined"
CXXFLAGS="$CXXFLAGS -fsanitize=undefined"

dnl Clang 17 adds stricter function pointer compatibility checks where pointer args cannot be
dnl cast to void*. In that case, set -fno-sanitize=function.
OLD_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -fno-sanitize-recover=undefined"
AC_RUN_IFELSE([AC_LANG_SOURCE([[
void foo(char *string) {}
int main(void) {
void (*f)(void *) = (void (*)(void *))foo;
f("foo");
}
]])],,[ubsan_needs_no_function=yes],)
CFLAGS="$OLD_CFLAGS"
if test "$ubsan_needs_no_function" = yes; then
CFLAGS="$CFLAGS -fno-sanitize=function"
CXXFLAGS="$CFLAGS -fno-sanitize=function"
fi
], [AC_MSG_ERROR([UndefinedBehaviorSanitizer is not available])])
fi

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