Kefu Chai bbd95765cc cmake: fix StdFilesystem detection ... before this change, we fails to detect std::filesystem with clang++, because the cmake project created by try_compile() only expands following options passed from its caller: - COMPILE_DEFINITIONS - INCLUDE_DIRECTORIES - LINK_DIRECTORIES - LINK_LIBRARIES which do not include CMAKE_CXX_FLAGS, so either we need to (ab)use COMPILE_DEFINITIONS for passing -std=c++17, or we can change the CMAKE_CXX_FLAGS in the parent env, as it turns out the created cmake project does inherit this flag from current project. in this change, we use the COMPILE_DEFINITIONS approach: simpler this way. and we can drop it once cmake 3.8 is required. Signed-off-by: Kefu Chai <kchai@redhat.com>		2018-08-02 14:37:49 +08:00
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modules	cmake: fix StdFilesystem detection	2018-08-02 14:37:49 +08:00