open_source / cmake

Commit eddb62435e5b03243df6c5220d023eca4d780fee

Authored by Peter M. Groen
2 parents 89c657f5 9a0514c5

Merge branch 'feat/pgroen/detect-cpp-standard' into 'master' 

Feat/pgroen/detect cpp standard

Om de hoogst mogelijke C++ standaard mogelijk te detecteren, wordt de compiler afgevraagd wat er wordt ondersteund. Deze standaard wordt dan gevolgd.
In de toekomst moet dit gedrag aan / uit gezet kunnen worden met een switch waarin een standaard hard kan worden gezet.

See merge request !1
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Showing 1 changed file with 18 additions and 6 deletions
compiler.cmake
  View file @eddb624
... ... @@ -127,13 +127,25 @@ if(CMAKE_COMPILER_IS_GNUCXX)
127 127 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mfpmath=sse" )
128 128 endif()
129 129  
130   - # -std=c++11 will be supported starting GCC 4.7, older versions need c++0x
131   - CHECK_CXX_COMPILER_FLAG( -std=c++11 cxxresult )
132   -
133   - if( NOT cxxresult)
134   - message(FATAL_ERROR, "Compiler does not support c++11")
  130 + MESSAGE(STATUS "Checking the c++ Standard supported by the compiler" )
  131 + # Check which version of c++ we can use. We drill down from c++17 to c96
  132 + CHECK_CXX_COMPILER_FLAG( -std=c++17 cxxresult )
  133 + if( NOT cxxresult )
  134 + CHECK_CXX_COMPILER_FLAG( -std=c++14 cxxresult )
  135 + if( NOT cxxresult )
  136 + CHECK_CXX_COMPILER_FLAG( -std=c++11 cxxresult )
  137 + if( NOT cxxresult )
  138 + set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x")
  139 + else()
  140 + set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
  141 + endif()
  142 + else()
  143 + set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++14")
  144 + endif()
  145 + else()
  146 + set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++17")
135 147 endif()
136   - set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
  148 + MESSAGE(STATUS "Compiling for ${CMAKE_CXX_FLAGS}")
137 149  
138 150 # -Wzero-as-null-pointer-constant is disabled for now, since the Qt 4.8.4
139 151 # macro's produce a bucketload of these warnings. Might be useful later on.
... ...