Extensions should have the final say on their compiler flags #6204
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nikic
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Currently compiler flags passed by extensions using the standard
PHP_NEW_EXTENSIONandPHP_ADD_SOURCESm4 macros are prepended before the ones defined byZend/Zend.m4. This was not really an issue before asZend.m4only included-Wallbut since the addition of-Wextravarious issue about disabling flags have been brought up, notably by @bwoebi and I've hit this once again in #6199A preliminary attempt was 5c1cf76 but this turns out to be more or less irrelevant.
The root issue is that
PHP_NEW_EXTENSIONandPHP_ADD_SOURCEScall thePHP_ADD_SOURCES_Xmacro and pass their flags as the 3rd argument which prepends the flags. There exists a 6th argument for this macro which appends them but from a cursory look at https://heap.space/search?full=PHP_ADD_SOURCES_X&project=php-src this is not used. Moreover, the comment describing this macro explicitly informs that this macro should not be used directly.The proposal is to drop the 6th argument of
PHP_ADD_SOURCES_Xand move thespecial-flagsargument to be appended instead of prepended.