On 18/05/14 20:03, Ivan Čukić wrote: > >> Ah, but what is clang's return value when there is an unrecognized option? > > It is 0. That is why I find the situation so strange. :)
And I thought I was being clever :-) It turns out that GenerateExportHeader uses check_cxx_compiler_flag, which greps the output of the compiler for text like "unknown .*option" or "unrecognized .*option". Given the *other* unknown option, it finds this output and concludes that -fvisibility=hidden is unsupported. This happens entirely independently of the CMAKE_CXX_VISIBILITY_PRESET and CMAKE_VISIBILITY_INLINES_HIDDEN options that actually set those flags on the compiler command line. So there are a couple of interacting issues here: check_cxx_compiler_flag is fragile in the face of unrelated unknown options, and the mechanism for deciding whether to add -fvisibility=hidden to the command line is different to the mechanism for deciding whether to put export symbols into the library. Alex _______________________________________________ Kde-frameworks-devel mailing list Kde-frameworks-devel@kde.org https://mail.kde.org/mailman/listinfo/kde-frameworks-devel
