"Equality comparison with extraneous parentheses" build failure(s) — clang 3.0

clang -Wall option integrates the option -Wparentheses-equality which gcc does not know about.
// clang -Wall -Werror -c plop.c

void foo() {
     int a=1;
     if ((a == 1)) {
        return;
     }
}
PackageVersionSupposed error messageFull log Bug report
altermime 0.3.10-7ffget.c:553:20: error: equality comparison with extraneous parentheses [-Werror,-Wparentheses-equality] Log 753058
blobwars 1.19-1src/player.cpp:293:34: error: equality comparison with extraneous parentheses [-Werror,-Wparentheses-equality] Log 753844
libss7 1.0.2-2mtp3.c:615:31: error: equality comparison with extraneous parentheses [-Werror,-Wparentheses-equality] Log
mozc 1.3.931.102-1out_linux/Release/obj/gen/converter/segmenter_inl.h:54:12: error: equality comparison with extraneous parentheses [-Werror,-Wparentheses-equality] Log

4 errors