Hi, I was struggling with a compilation of a project via CMake. Thu build kept failing for unknown reasons until I realized that CMake would automatically compile with
-isysroot /Developer/SDKs/MacOSX10.6.sdk \ -mmacosx-version-min=10.6 (or any other sdk, depending on OS version) unless instructed *NOT* to do so by specifying: -DCMAKE_OSX_SYSROOT="/" -DCMAKE_OSX_DEPLOYMENT_TARGET="" I had extra problems due to the fact that software which I was compiling called CMake itself and so the projects that were being included and automatically compiled in the process were failing even if I set those two flags. OK, the fact that these two flags weren't passed to the "child build" was clearly a bug in that software that needs to fixed, but still. Why is the default behavior of CMake to always add -isysroot unless instructed otherwise? I'm compiling from command-line, using "cmake -D<flag1> -D<flag2> ..." generating gnu makefiles, using CMake version 3.0.0 and clang as the compiler. The reason why I was struggling was because I had to compile C++11 code on OS X 10.6 and have installed libc++ in /usr/lib, but -isysroot reported a broken C++ compiler when that library was absent from the SDK. While that might be a strange reason, there might be other valid cases when one really expects the default behaviour when not passing any flags. Thank you, Mojca -- Powered by www.kitware.com Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Kitware offers various services to support the CMake community. For more information on each offering, please visit: CMake Support: http://cmake.org/cmake/help/support.html CMake Consulting: http://cmake.org/cmake/help/consulting.html CMake Training Courses: http://cmake.org/cmake/help/training.html Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Follow this link to subscribe/unsubscribe: http://public.kitware.com/mailman/listinfo/cmake