68 lines
2.2 KiB
CMake
68 lines
2.2 KiB
CMake
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# ------------------------------------------------------------------------------
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# Compiler features definition and flags
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# ------------------------------------------------------------------------------
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# Initialize ALL_COMPILER_FEATURES as empty list.
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set(ALL_COMPILER_FEATURES "float128")
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# Making sure ALL_COMPILER_FEATURES is sorted.
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list(SORT ALL_COMPILER_FEATURES)
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# Function to check whether the compiler supports the provided set of features.
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# Usage:
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# compiler_supports(
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# <output variable>
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# <list of cpu features>
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# )
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function(compiler_supports output_var features)
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_intersection(var "${LIBC_CPU_FEATURES}" "${features}")
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if("${var}" STREQUAL "${features}")
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set(${output_var} TRUE PARENT_SCOPE)
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else()
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unset(${output_var} PARENT_SCOPE)
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endif()
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endfunction()
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# ------------------------------------------------------------------------------
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# Internal helpers and utilities.
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# ------------------------------------------------------------------------------
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# Computes the intersection between two lists.
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function(_intersection output_var list1 list2)
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foreach(element IN LISTS list1)
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if("${list2}" MATCHES "(^|;)${element}(;|$)")
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list(APPEND tmp "${element}")
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endif()
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endforeach()
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set(${output_var} ${tmp} PARENT_SCOPE)
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endfunction()
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set(AVAILABLE_COMPILER_FEATURES "")
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# Try compile a C file to check if flag is supported.
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set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
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foreach(feature IN LISTS ALL_COMPILER_FEATURES)
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try_compile(
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has_feature
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${CMAKE_CURRENT_BINARY_DIR}/compiler_features
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SOURCES ${LIBC_SOURCE_DIR}/cmake/modules/compiler_features/check_${feature}.cpp
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COMPILE_DEFINITIONS -I${LIBC_SOURCE_DIR} ${LIBC_COMPILE_OPTIONS_NATIVE}
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)
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if(has_feature)
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list(APPEND AVAILABLE_COMPILER_FEATURES ${feature})
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if(${feature} STREQUAL "float128")
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set(LIBC_COMPILER_HAS_FLOAT128 TRUE)
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endif()
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endif()
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endforeach()
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message(STATUS "Compiler features available: ${AVAILABLE_COMPILER_FEATURES}")
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### Compiler Feature Detection ###
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# clang-8+, gcc-12+
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check_cxx_compiler_flag("-ftrivial-auto-var-init=pattern" LIBC_CC_SUPPORTS_PATTERN_INIT)
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# clang-6+, gcc-13+
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check_cxx_compiler_flag("-nostdlib++" LIBC_CC_SUPPORTS_NOSTDLIBPP)
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