How can I get full option string "-std=..." after set(CMAKE_CXX_STANDARD 17) ? String with a flag must be obtained inside CmakeLists.txt.
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It is need for build precompilled headers. Actually possible use may be different. – user1931823 Jul 28 '17 at 10:44
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To generate, build and integrate PCHs with CMake with minimal effort have a look at [cotire](https://github.com/sakra/cotire). – Torbjörn Jul 28 '17 at 20:24
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"$(CXX_FLAGS)" (round brackets important) contains "-std=..." flag and expand inside a makefile.
user1931823
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