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* The -Wno-unused-but-set-variable flag is supported by gcc but not clang, so move it to a gcc-only CFLAGS. * The -Wno-error=uninitialized flag is supported by both gcc and clang, so move it to CFLAGS shared by gcc and clang. * Also suppress -Wunreachable-code and -Wshift-negative-value clang warnings. gcc supports -Wshift-negative-value, but only starting in gcc 6.1 and we are still using gcc 4.9 in automation. warning: unknown warning option '-Wno-unused-but-set-variable'; did you mean '-Wno-unused-const-variable'? [-Wunknown-warning-option] gfx/cairo/cairo/src/cairo-quartz-surface.c:1908:6: warning: code will never be executed [-Wunreachable-code] gfx/cairo/libpixman/src/pixman-bits-image.c:268:32: warning: shifting a negative signed value is undefined [-Wshift-negative-value] MozReview-Commit-ID: AnQAsfDaZbk --HG-- extra : rebase_source : 6dd94a39479e05f67f93d4e4be2bd10ece4df7be extra : source : 34ddaea5129be2ae1e9faa0a1d905b8690909611