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Old CMake: Correctly handle try_compile with language standard flags 

CMake before 3.7 didn't properly pass the standard selection flags
to try_compile. Wrap try_compile on old CMake versions so that the
flag gets passed.
master
Nicolas Hake 2018-12-31 16:17:37 +01:00
parent bc88820d57
commit 1b2f2889ad
1 changed files with 31 additions and 0 deletions
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31
CMakeLists.txt
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@ -23,6 +23,37 @@ if(NOT CMAKE_BUILD_TYPE)
set(CMAKE_BUILD_TYPE RelWithDebInfo)
endif()
if(POLICY CMP0067)
cmake_policy(SET CMP0067 NEW)
else()
# Wrap try_compile such that it correctly passes the standard flags to the
# compiler on CMake versions below 3.8. Remove when you update the minimum
# required version to 3.8 or later.
macro(try_compile)
set(_tc_langs)
foreach(_tc_lang CXX C)
if(DEFINED CMAKE_${_tc_lang}_STANDARD)
list(APPEND _tc_langs ${_tc_lang})
endif()
endforeach()
foreach(_tc_lang ${_tc_langs})
if (${CMAKE_${_tc_lang}_EXTENSIONS})
set(_tc_ext EXTENSION)
else()
set(_tc_ext STANDARD)
endif()
set(_backup_${_tc_lang}_flags "${CMAKE_${_tc_lang}_FLAGS}")
set(CMAKE_${_tc_lang}_FLAGS "${CMAKE_${_tc_lang}_FLAGS} ${CMAKE_${_tc_lang}${CMAKE_${_tc_lang}_STANDARD}_${_tc_ext}_COMPILE_OPTION}")
endforeach()
_try_compile(${ARGN})
foreach(_tc_lang ${_tc_langs})
set(CMAKE_${_tc_lang}_FLAGS "${_backup_${_tc_lang}_flags}")
endforeach()
endmacro()
endif()
project (openclonk CXX C)
set(CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")