CMake: fix test for warning suppressions#5714
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GCC doesn't warn for unknown `-Wno-` options, except if there are other warnings or errors [0]. This was problematic with `CURL_WERROR` as that warning-as-error cannot be suppressed. Notably, this always happened with `-Wno-pedantic-ms-format` when not targeting Windows. So test for the positive form of the warning instead, which should always result in a diagnostic if unknown. [0] https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html Closes
jzakrzewski
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Jul 23, 2020
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Looks sensible to me.
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GCC doesn't warn for unknown
-Wno-options, except if there are otherwarnings or errors [0]. This was problematic with
CURL_WERRORas thatwarning-as-error cannot be suppressed. Notably, this always happened
with
-Wno-pedantic-ms-formatwhen not targeting Windows. So test forthe positive form of the warning instead, which should always result in
a diagnostic if unknown.
[0] https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html