72 lines
2.4 KiB
CMake
72 lines
2.4 KiB
CMake
###############################################################################
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if (__nc_cxx)
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return ()
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endif ()
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set (__nc_cxx TRUE)
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###############################################################################
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# clear the default flags because they include optimisation flags we
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# explicitly do not want (ie, O3).
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set (CMAKE_CXX_FLAGS_RELEASE "")
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set (CMAKE_C_FLAGS_RELEASE "")
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set (CMAKE_CXX_FLAGS_DEBUG "")
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set (CMAKE_C_FLAGS_DEBUG "")
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###############################################################################
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include (compile_flag)
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include (test_restrict)
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###############################################################################
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append_compile_flag ("-std=c++1z")
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append_compile_flag ("-fpermissive")
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append_compile_flag ("/std:c++latest")
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# try to use clangs libc++ under the assumption that gcc will fail this test
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# and clang will pass (if it is present). this is necessary because some
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# libstdc++ headers don't behave well under c++17/clang.
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append_compile_flag ("-stdlib=libc++")
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###############################################################################
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# find the gcc or clang filesystem library and append to libs if needed
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#
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# note, we specifically _cannot_ use find_library because it just makes wild
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# hardcoded guess and doesn't respect _all_ the system paths; specifically
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# something like /usr/lib/gcc/x86_64-pc-linux-gnu/6.3.0/libstdc++.so won't get
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# discovered.
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if (NOT DEFINED __nc_cxx_stdcxxfs)
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foreach(lib "" "c++experimental" "stdc++fs")
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if (NOT __nc_cxx_stdcxxfs)
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try_compile(
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__nc_cxx_stdcxxfs ${CMAKE_CURRENT_BINARY_DIR}
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SOURCES
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${CMAKE_CURRENT_SOURCE_DIR}/cmake/nc_cxx_stdcxxfs.cpp
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LINK_LIBRARIES
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${lib})
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if (__nc_cxx_stdcxxfs)
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set (__nc_cxx_stdcxxfs "${lib}" CACHE INTERNAL "library required for c++ filesystem")
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endif ()
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endif ()
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endforeach()
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if (NOT __nc_cxx_stdcxxfs)
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set (__nc_cxx_stdcxxfs "")
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endif ()
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endif ()
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link_libraries (${__nc_cxx_stdcxxfs})
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###############################################################################
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test_restrict(RESTRICT_KEYWORD)
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add_definitions("-Drestrict=${RESTRICT_KEYWORD}")
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###############################################################################
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append_compile_flag("-pipe")
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append_compile_flag("-fno-deduce-init-list")
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append_compile_flag("-fvisibility=hidden")
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