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https://github.com/GothenburgBitFactory/taskwarrior.git
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98204b17a6
Instead of setting `-std` compiler flag directly, set the `CMAKE_CXX_STANDARD` variable. This lets CMake know the required C++ standard and evaluate the final compiler flag correctly, taking into account compile features set by `target_compile_features()`. This change preserves the existing behavior, where compiler extensions are disabled for other targets than Cygwin.
42 lines
1.5 KiB
CMake
42 lines
1.5 KiB
CMake
message ("-- Configuring C++17")
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message ("-- System: ${CMAKE_SYSTEM_NAME}")
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include (CheckCXXCompilerFlag)
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CHECK_CXX_COMPILER_FLAG("-std=c++17" _HAS_CXX17)
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if (_HAS_CXX17)
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set (CMAKE_CXX_STANDARD 17)
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set (CMAKE_CXX_EXTENSIONS OFF)
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else (_HAS_CXX17)
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message (FATAL_ERROR "C++17 support missing. Try upgrading your C++ compiler. If you have a good reason for using an outdated compiler, please let us know at support@gothenburgbitfactory.org.")
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endif (_HAS_CXX17)
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if (${CMAKE_SYSTEM_NAME} MATCHES "Linux")
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set (LINUX true)
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elseif (${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
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set (DARWIN true)
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set (_CXX14_FLAGS "${_CXX14_FLAGS} -stdlib=libc++")
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elseif (${CMAKE_SYSTEM_NAME} MATCHES "kFreeBSD")
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set (KFREEBSD true)
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elseif (${CMAKE_SYSTEM_NAME} MATCHES "FreeBSD")
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set (FREEBSD true)
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elseif (${CMAKE_SYSTEM_NAME} MATCHES "OpenBSD")
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set (OPENBSD true)
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elseif (${CMAKE_SYSTEM_NAME} MATCHES "NetBSD")
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set (NETBSD true)
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elseif (${CMAKE_SYSTEM_NAME} MATCHES "DragonFly")
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set (DRAGONFLY true)
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elseif (${CMAKE_SYSTEM_NAME} MATCHES "SunOS")
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set (SOLARIS true)
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elseif (${CMAKE_SYSTEM_NAME} STREQUAL "GNU")
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set (GNUHURD true)
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elseif (${CMAKE_SYSTEM_NAME} STREQUAL "CYGWIN")
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set (CYGWIN true)
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set (CMAKE_CXX_EXTENSIONS ON)
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else (${CMAKE_SYSTEM_NAME} MATCHES "Linux")
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set (UNKNOWN true)
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endif (${CMAKE_SYSTEM_NAME} MATCHES "Linux")
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set (CMAKE_CXX_FLAGS "${_CXX14_FLAGS} ${CMAKE_CXX_FLAGS}")
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set (CMAKE_CXX_FLAGS "-Wall -Wextra -Wsign-compare -Wreturn-type ${CMAKE_CXX_FLAGS}")
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