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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