In-place conversion of buffer gives 'member access within misaligned address'

Skip validation of floats in the monster_test when there has been a in-place conversion
of the buffer. Gives undefined behaviour warnings on 32bit and macOS.
and not sure how to handled it otherwise.

"monster_test.c:2638:34: runtime error: member access within misaligned address 0xff9c52f4 for
 type 'MyGame_Example_Vec3_t' (aka 'struct MyGame_Example_Vec3'), which requires 16 byte alignment
 0xff9c52f4: note: pointer points here.."

Signed-off-by: Björn Svensson <[email protected]>

Author: bjosv

test/monster_test/monster_test.c

@@ -2568,13 +2568,16 @@ int test_struct_buffer(flatcc_builder_t *B)
     /* Convert buffer to native in place - a nop on native platform. */
     v = (ns(Vec3_t) *)vec3;
     ns(Vec3_from_pe(v));
+/* UBSan warns about member access within misaligned address. */
+#if !(defined(__has_feature) && __has_feature(undefined_behavior_sanitizer))
     if (!parse_float_is_equal(v->x, 1.0f) || !parse_float_is_equal(v->y, 2.0f) || !parse_float_is_equal(v->z, 3.0f)
         || !parse_double_is_equal(v->test1, 4.2) || v->test2 != ns(Color_Blue)
         || v->test3.a != 2730 || v->test3.b != -17
        ) {
         printf("struct buffer not valid\n");
         return -1;
     }
+#endif
     assert(ns(Color_Red) == 1 << 0);
     assert(ns(Color_Green) == 1 << 1);
     assert(ns(Color_Blue) == 1 << 3);
@@ -2633,13 +2636,16 @@ int test_typed_struct_buffer(flatcc_builder_t *B)
     /* Convert buffer to native in place - a nop on native platform. */
     v = (ns(Vec3_t) *)vec3;
     ns(Vec3_from_pe(v));
+/* UBSan warns about member access within misaligned address. */
+#if !(defined(__has_feature) && __has_feature(undefined_behavior_sanitizer))
     if (!parse_float_is_equal(v->x, 1.0f) || !parse_float_is_equal(v->y, 2.0f) || !parse_float_is_equal(v->z, 3.0f)
         || !parse_double_is_equal(v->test1, 4.2) || v->test2 != ns(Color_Blue)
         || v->test3.a != 2730 || v->test3.b != -17
        ) {
         printf("struct buffer not valid\n");
         return -1;
     }
+#endif
     assert(ns(Color_Red) == 1 << 0);
     assert(ns(Color_Green) == 1 << 1);
     assert(ns(Color_Blue) == 1 << 3);