Revised handling of unknown warnings #554
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`-W<some unknown warning>` is now (by default) a warning (not a fatal error) and `-Wno-<some unknown warning>` is ignored. This is what GCC and Clang do. This commit also introduces the `unknown-warning-option` warning, so that warnings about unknown warnings can be ignored (`-Wno-unknown-warning-option`) or turned into an error (`-Werror=unknown-warning-option`). This is what Clang does. Closes: #552
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Currently, unrecognized warning options
-Wsome-unknown-warningare fatal errors.As suggested in #552, this PR makes sure that
-Wsome-unknown-warningis a warning (by default), and that-Wno-some-unknown-warningis ignored. This is what GCC and Clang do.This commit also introduces the
unknown-warning-optionwarning, so that warnings about unknown warnings can be ignored (-Wno-unknown-warning-option) or turned into an error (-Werror=unknown-warning-option). This is what Clang does.Closes: #552