Fix the CC_CHECK_FLAG_APPEND macro to test appended flags in context to current flag values. Otherwise, it is possible to append flags colliding with user's *FLAGS or even previously appended flags that will cause the build to fail.
Fix the CC_CHECK_FLAG_APPEND macro to test appended flags in context to current flag values. Otherwise, it is possible to append flags colliding with user's *FLAGS or even previously appended flags that will cause the build to fail.