Disable -fsanitize=function on Clang 17

Closes GH-12642

Author: iluuu1994

configure.ac

@@ -1581,6 +1581,23 @@ if test "$PHP_UNDEFINED_SANITIZER" = "yes"; then
       CFLAGS="$CFLAGS -fno-sanitize=object-size"
       CXXFLAGS="$CFLAGS -fno-sanitize=object-size"
     ])
+
+    dnl Clang 17 adds stricter function pointer compatibility checks where pointer args cannot be
+    dnl cast to void*. In that case, set -fno-sanitize=function.
+    OLD_CFLAGS="$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