efae3174f0
These have the same purposes but two different implementations. llvm_check_compiler_linker_flag uses CMAKE_REQUIRED_FLAGS which affects flags used both for compilation and linking which is problematic because some flags may be link-only and trigger unused argument warning when set during compilation. llvm_check_linker_flag does not have this issue so we chose it as the prevailaing implementation. Differential Revision: https://reviews.llvm.org/D143052
29 lines
879 B
CMake
29 lines
879 B
CMake
include(CheckLinkerFlag OPTIONAL)
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if (COMMAND check_linker_flag)
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macro(llvm_check_linker_flag)
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check_linker_flag(${ARGN})
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endmacro()
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else()
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# Until the minimum CMAKE version is 3.18
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include(CheckCXXCompilerFlag)
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# cmake builtin compatible, except we assume lang is C or CXX
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function(llvm_check_linker_flag lang flag out_var)
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cmake_policy(PUSH)
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cmake_policy(SET CMP0056 NEW)
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set(_CMAKE_EXE_LINKER_FLAGS_SAVE ${CMAKE_EXE_LINKER_FLAGS})
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set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${flag}")
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if("${lang}" STREQUAL "C")
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check_c_compiler_flag("" ${out_var})
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elseif("${lang}" STREQUAL "CXX")
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check_cxx_compiler_flag("" ${out_var})
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else()
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message(FATAL_ERROR "\"${lang}\" is not C or CXX")
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endif()
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set(CMAKE_EXE_LINKER_FLAGS ${_CMAKE_EXE_LINKER_FLAGS_SAVE})
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cmake_policy(POP)
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endfunction()
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endif()
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