54 lines
1.4 KiB
CMake
54 lines
1.4 KiB
CMake
include(CheckCXXCompilerFlag)
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function(env_set var_name default_value type docstring)
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set(val ${default_value})
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if(DEFINED ENV{${var_name}})
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set(val $ENV{${var_name}})
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endif()
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set(${var_name} ${val} CACHE ${type} "${docstring}")
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endfunction()
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function(default_linker var_name)
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if(APPLE)
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set("${var_name}" "DEFAULT" PARENT_SCOPE)
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elseif(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
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find_program(lld_path ld.lld "Path to LLD - is only used to determine default linker")
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if(lld_path)
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set("${var_name}" "LLD" PARENT_SCOPE)
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else()
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set("${var_name}" "DEFAULT" PARENT_SCOPE)
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endif()
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else()
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set("${var_name}" "DEFAULT" PARENT_SCOPE)
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endif()
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endfunction()
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function(use_libcxx out)
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if(APPLE OR CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
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set("${out}" ON PARENT_SCOPE)
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else()
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set("${out}" OFF PARENT_SCOPE)
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endif()
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endfunction()
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function(static_link_libcxx out)
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if(APPLE)
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set("${out}" OFF PARENT_SCOPE)
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elseif(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
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default_linker(linker)
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if(NOT linker STREQUAL "LLD")
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set("${out}" OFF PARENT_SCOPE)
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return()
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endif()
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find_library(libcxx_a libc++.a)
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find_library(libcxx_abi libc++abi.a)
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if(libcxx_a AND libcxx_abi)
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set("${out}" ON PARENT_SCOPE)
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else()
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set("${out}" OFF PARENT_SCOPE)
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endif()
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else()
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set("${out}" ON PARENT_SCOPE)
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endif()
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endfunction()
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