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allow C/C++ standard to be specified at build time, default to C++11 if supported

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This commit is contained in:
Bill Torpey 2020-05-11 16:47:02 -04:00
parent 820efb31bd
commit f474b226b6
1 changed files with 13 additions and 8 deletions
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5
CMakeLists.txt
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@ -68,16 +68,21 @@ if(${CMAKE_SYSTEM_NAME} STREQUAL Darwin)
endif() endif()
if (NOT MSVC) if (NOT MSVC)
if(NOT CMAKE_CXX_FLAGS MATCHES "-std=")
# use C++11 by default if supported
check_cxx_compiler_flag("-std=gnu++11" COMPILER_SUPPORTS_CXX11) check_cxx_compiler_flag("-std=gnu++11" COMPILER_SUPPORTS_CXX11)
if(COMPILER_SUPPORTS_CXX11) if(COMPILER_SUPPORTS_CXX11)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++11") set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++11")
endif() endif()
endif()
if(NOT CMAKE_C_FLAGS MATCHES "-std=")
check_c_compiler_flag("-std=gnu11" COMPILER_SUPPORTS_C11) check_c_compiler_flag("-std=gnu11" COMPILER_SUPPORTS_C11)
if(COMPILER_SUPPORTS_C11) if(COMPILER_SUPPORTS_C11)
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu11") set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu11")
else() else()
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu99") set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu99")
endif() endif()
endif()
# clang 6 has a warning that does not make sense on multi-platform code # clang 6 has a warning that does not make sense on multi-platform code
check_cxx_compiler_flag("-Wno-tautological-constant-compare" CXX_HAS_TAUT_WARNING) check_cxx_compiler_flag("-Wno-tautological-constant-compare" CXX_HAS_TAUT_WARNING)