[Mesa-dev] testing for certain compiler options does not work

[Marc Dietrich]

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?

Marc
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