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CMake: Enforce minimum C++ mode support

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This commit is contained in:
FranciscoPombal 2020-04-11 16:20:48 +01:00
parent f63e70b449
commit d593d6baa1
4 changed files with 30 additions and 16 deletions
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24
cmake/Modules/FunctionQbtCXXCompilerAndModeCheck.cmake Normal file
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@ -0,0 +1,24 @@
# Function for ensuring the build does not use a lower than the required minimum C++ mode, _min_std.
# It fails the build if:
# - the compiler does not fully support _min_std
# - the user specified a mode lower than _min_std via the CMAKE_CXX_STANDARD variable
# If both checks are successful, it sets the following variables at the PARENT_SCOPE:
# - CMAKE_CXX_STANDARD with the value _min_std, if it was not already set to a value >= _min_std
# - CMAKE_CXX_STANDARD_REQUIRED with the value ON
function(qbt_minimum_cxx_mode_check _min_std)
# ensure the compiler fully supports the minimum required C++ mode.
if(NOT CMAKE_CXX${_min_std}_STANDARD__HAS_FULL_SUPPORT)
message(FATAL_ERROR "${PROJECT_NAME} requires a compiler with full C++${_min_std} support")
endif()
# now we know that the compiler fully supports the minimum required C++ mode,
# but we must still prevent the user or compiler from forcing/defaulting to an insufficient C++ mode
if(NOT CMAKE_CXX_STANDARD)
set(CMAKE_CXX_STANDARD ${_min_std} PARENT_SCOPE)
elseif((CMAKE_CXX_STANDARD VERSION_LESS ${_min_std}) OR (CMAKE_CXX_STANDARD VERSION_EQUAL 98))
message(FATAL_ERROR "${PROJECT_NAME} has to be built with at least C++${_min_std} mode.")
endif()
set(CMAKE_CXX_STANDARD_REQUIRED ON PARENT_SCOPE)
endfunction()

5
cmake/Modules/MacroQbtCompilerSettings.cmake
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@ -24,11 +24,6 @@ macro(qbt_set_compiler_options)
#"-Wno-error=sign-conversion -Wno-error=float-equal"
)
# GCC 4.8 has problems with std::array and its initialization
if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.9)
list(APPEND _GCC_COMMON_CXX_FLAGS "-Wno-error=missing-field-initializers")
endif()
include(CheckCXXCompilerFlag)
# check for -pedantic
check_cxx_compiler_flag(-pedantic _PEDANTIC_IS_SUPPORTED)