cmake: CMake compile features support
Fixes: #36558 #32577 This commit introduces CMAKE_C_COMPILE_FEATURES and CMAKE_CXX_COMPILE_FEATURES. This allows users to use the `target_compile_features()` in their own code. In Zephyr, the CMAKE_C/CXX_COMPILE_FEATURES are defined based on the compiler and the Kconfig / CSTD setting. Doing so ensures that a user compiling Zephyr with c99 and specifies `target_compile_features(<target> ... c_std_11)` will get an error. And similar if building Zephyr with C++ support and c++11, but testing for `target_compile_features(<target> ... cxx_std_17)`. For example in the C++ case, the user must ensure that Zephyr is compiled with C++17, that is: CPLUSPLUS=y and STD_CPP17=y, in which case the CMAKE_CXX_COMPILE_FEATURES will contain support for C++17 and thus the `target_compile_features(<target> ... cxx_std_17)` will succeed. Signed-off-by: Torsten Rasmussen <Torsten.Rasmussen@nordicsemi.no>
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3 changed files with 40 additions and 0 deletions
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@ -168,21 +168,29 @@ if(CONFIG_CPLUSPLUS)
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# Kconfig choice ensures only one of these CONFIG_STD_CPP* is set.
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if(CONFIG_STD_CPP98)
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set(STD_CPP_DIALECT_FLAGS $<TARGET_PROPERTY:compiler-cpp,dialect_cpp98>)
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list(APPEND CMAKE_CXX_COMPILE_FEATURES ${compile_features_cpp98})
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elseif(CONFIG_STD_CPP11)
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set(STD_CPP_DIALECT_FLAGS $<TARGET_PROPERTY:compiler-cpp,dialect_cpp11>) # Default in kconfig
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list(APPEND CMAKE_CXX_COMPILE_FEATURES ${compile_features_cpp11})
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elseif(CONFIG_STD_CPP14)
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set(STD_CPP_DIALECT_FLAGS $<TARGET_PROPERTY:compiler-cpp,dialect_cpp14>)
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list(APPEND CMAKE_CXX_COMPILE_FEATURES ${compile_features_cpp14})
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elseif(CONFIG_STD_CPP17)
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set(STD_CPP_DIALECT_FLAGS $<TARGET_PROPERTY:compiler-cpp,dialect_cpp17>)
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list(APPEND CMAKE_CXX_COMPILE_FEATURES ${compile_features_cpp17})
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elseif(CONFIG_STD_CPP2A)
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set(STD_CPP_DIALECT_FLAGS $<TARGET_PROPERTY:compiler-cpp,dialect_cpp2a>)
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list(APPEND CMAKE_CXX_COMPILE_FEATURES ${compile_features_cpp20})
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elseif(CONFIG_STD_CPP20)
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set(STD_CPP_DIALECT_FLAGS $<TARGET_PROPERTY:compiler-cpp,dialect_cpp20>)
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list(APPEND CMAKE_CXX_COMPILE_FEATURES ${compile_features_cpp20})
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elseif(CONFIG_STD_CPP2B)
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set(STD_CPP_DIALECT_FLAGS $<TARGET_PROPERTY:compiler-cpp,dialect_cpp2b>)
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list(APPEND CMAKE_CXX_COMPILE_FEATURES ${compile_features_cpp20})
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else()
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assert(0 "Unreachable code. Expected C++ standard to have been chosen. See Kconfig.zephyr.")
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endif()
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set(CMAKE_CXX_COMPILE_FEATURES ${CMAKE_CXX_COMPILE_FEATURES} PARENT_SCOPE)
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zephyr_compile_options($<$<COMPILE_LANGUAGE:CXX>:${STD_CPP_DIALECT_FLAGS}>)
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endif()
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@ -979,6 +987,7 @@ set_ifndef(CSTD c99)
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zephyr_compile_options(
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$<$<COMPILE_LANGUAGE:C>:$<TARGET_PROPERTY:compiler,cstd>${CSTD}>
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)
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set(CMAKE_C_COMPILE_FEATURES ${compile_features_${CSTD}} PARENT_SCOPE)
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# @Intent: Configure linker scripts, i.e. generate linker scripts with variables substituted
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toolchain_ld_configure_files()
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26
cmake/compiler/compiler_features.cmake
Normal file
26
cmake/compiler/compiler_features.cmake
Normal file
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@ -0,0 +1,26 @@
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set(c23id c2x gnu2x)
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set(c17id c17 c18 gnu17 gnu18 "iso9899:2017" "iso9899:2018")
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set(c11id c11 gnu11 "iso9899:2011")
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set(c99id c99 gnu99 "iso9899:1999")
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set(c90id c89 c90 gnu89 gnu90 "iso9899:1990" "iso9899:199409")
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set(compile_features_list)
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# For each id value above a compile_features_${idval} with a list of supported
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# `c_std_XX` values are created for easy lookup.
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# For example, the settings
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# - `compile_feature_c99` will contain `c_std_90;c_std_99`
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# - `compile_feature_iso9899:2011` will contain `c_std_90;c_std_99;c_std_11`
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# that can then be used to set CMAKE_C_COMPILE_FEATURES accordingly.
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foreach(standard 90 99 11 17 23)
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list(APPEND compile_features_list c_std_${standard})
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foreach(id ${c${standard}id})
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set(compile_features_${id} ${compile_features_list})
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endforeach()
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endforeach()
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set(compile_features_cpp98 cxx_std_98)
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set(compile_features_cpp11 cxx_std_11 ${compile_features_cpp98})
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set(compile_features_cpp14 cxx_std_14 ${compile_features_cpp11})
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set(compile_features_cpp17 cxx_std_17 ${compile_features_cpp14})
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set(compile_features_cpp20 cxx_std_20 ${compile_features_cpp17})
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@ -24,6 +24,11 @@ set(TOOLCHAIN_SIGNATURE ${CMAKE_C_COMPILER_MD5_SUM})
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string(MD5 COMPILER_SIGNATURE ${CMAKE_C_COMPILER}_${CMAKE_C_COMPILER_ID}_${CMAKE_C_COMPILER_VERSION})
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set(TOOLCHAIN_SIGNATURE ${TOOLCHAIN_SIGNATURE}_${COMPILER_SIGNATURE})
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# Load the compile features file which will provide compile features lists for
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# various C / CXX language dialects that can then be exported based on current
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# Zephyr Kconfig settings or the CSTD global property.
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include(${CMAKE_CURRENT_LIST_DIR}/compiler/compiler_features.cmake)
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# Loading of templates are strictly not needed as they does not set any
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# properties.
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# They purely provides an overview as well as a starting point for supporting
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