Hello, While compiling cmake3.13.4 using pkgsrc I had an error because I'm using a new version of clang7.0.1 witth an old version of libstdc++5.4.0.
I propose to change the preprocess tests using __cplusplus >= xxx in Source/cmAlgorithms.h by their appropriate define like you do for unique_ptr using: CMake_HAVE_CXX_UNIQUE_PTR. To make it work you need to add the extra cm_check_cxx_feature in Source/Checks/cm_cxx_features.cmake and the test files in Source/Checks: cm_cxx_size_t.cxx, cm_cxx_cbegin.cxx and cm_cxx_cend.cxx. I attached the files I modified as example it won't take more than 15min to diff, integrate and commit I promise. What do you think? Best, Mathieu
cm_cxx_cbegin.cxx
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cm_cxx_size_t.cxx
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cm_cxx_features.cmake
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cm_cxx_cend.cxx
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cmAlgorithms.h
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