Hi Ian, Am Mittwoch, 6. Dezember 2017, 21:21:53 CET schrieb Ian Romanick: > On 11/29/2017 08:16 AM, Marc Dietrich wrote: > > Hi, > > > > just found that my gcc 'gcc (SUSE Linux) 7.2.1 20171020 [gcc-7-branch > > revision 253932]' does not warn when using the negative form of > > unsupported warning options. So all the configure tests for such options > > erroneously succeed, e.g: > > > > gcc -Wno-bob test.c # works fine > > > > gcc -Walice test.c # warns for unsupported compiler option > > > > Maybe gcc bug or intended behaviour, maybe only unique to my version? > > At least 6.4.1 does not have this problem, but our checks must be broken > in a different way. I see piles of
I just found that this is not a gcc bug but a feature (since 4.4), so this should also happen with your compiler: https://gcc.gnu.org/wiki/FAQ#wnowarning > > cc1: warning: unrecognized command line option â-Wno-initializer- overridesâ this should not happen, because this is the clang option which fails with gcc. Is this with meson or autotools? Are you sure you applied the patch? I tested it with both, gcc and clang and it works file here. > This probably explains why I see piles of > > cc1: warning: unrecognized command line option â-Wno-initializer- overridesâ > > in my builds.
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