FranciscoPombal
5 years ago
4 changed files with 30 additions and 16 deletions
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# Function for ensuring the build does not use a lower than the required minimum C++ mode, _min_std. |
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# It fails the build if: |
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# - the compiler does not fully support _min_std |
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# - the user specified a mode lower than _min_std via the CMAKE_CXX_STANDARD variable |
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# If both checks are successful, it sets the following variables at the PARENT_SCOPE: |
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# - CMAKE_CXX_STANDARD with the value _min_std, if it was not already set to a value >= _min_std |
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# - CMAKE_CXX_STANDARD_REQUIRED with the value ON |
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function(qbt_minimum_cxx_mode_check _min_std) |
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# ensure the compiler fully supports the minimum required C++ mode. |
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if(NOT CMAKE_CXX${_min_std}_STANDARD__HAS_FULL_SUPPORT) |
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message(FATAL_ERROR "${PROJECT_NAME} requires a compiler with full C++${_min_std} support") |
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endif() |
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# now we know that the compiler fully supports the minimum required C++ mode, |
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# but we must still prevent the user or compiler from forcing/defaulting to an insufficient C++ mode |
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if(NOT CMAKE_CXX_STANDARD) |
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set(CMAKE_CXX_STANDARD ${_min_std} PARENT_SCOPE) |
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elseif((CMAKE_CXX_STANDARD VERSION_LESS ${_min_std}) OR (CMAKE_CXX_STANDARD VERSION_EQUAL 98)) |
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message(FATAL_ERROR "${PROJECT_NAME} has to be built with at least C++${_min_std} mode.") |
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endif() |
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set(CMAKE_CXX_STANDARD_REQUIRED ON PARENT_SCOPE) |
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endfunction() |
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