On Wednesday 04 July 2012 09:53:46 Max Horn wrote: > Using ccache with clang tends to generate tons of warnings, which can range > from simply being annoying, to causing autoconf failures. This is because > ccache runs the compiler with "-E" on preprocessed input, but also passes > -I, -isystem etc. flags on to the compiler. In clang, this triggers > warnings about unused arguments.
err, -I/-isystem/-D/-U/etc... are preprocessor flags and are valid when running in preprocessor mode (-E). i don't know if clang is broken, or your analysis is incorrect, but certainly that behavior you describe is wrong. -mike
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