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-rw-r--r--cmake/Modules/LLVMCheckCompilerLinkerFlag.cmake41
1 files changed, 17 insertions, 24 deletions
diff --git a/cmake/Modules/LLVMCheckCompilerLinkerFlag.cmake b/cmake/Modules/LLVMCheckCompilerLinkerFlag.cmake
index f61ec0585f9a..2f438707783d 100644
--- a/cmake/Modules/LLVMCheckCompilerLinkerFlag.cmake
+++ b/cmake/Modules/LLVMCheckCompilerLinkerFlag.cmake
@@ -1,28 +1,20 @@
-include(CMakePushCheckState)
+include(CheckLinkerFlag OPTIONAL)
-include(CheckCompilerFlag OPTIONAL)
+if (COMMAND check_linker_flag)
+ macro(llvm_check_compiler_linker_flag)
+ check_linker_flag(${ARGN})
+ endmacro()
+else()
+ # Until the minimum CMAKE version is 3.18
-if(NOT COMMAND check_compiler_flag)
- include(CheckCCompilerFlag)
include(CheckCXXCompilerFlag)
-endif()
-
-function(llvm_check_compiler_linker_flag lang flag out_var)
- # If testing a flag with check_c_compiler_flag, it gets added to the compile
- # command only, but not to the linker command in that test. If the flag
- # is vital for linking to succeed, the test would fail even if it would
- # have succeeded if it was included on both commands.
- #
- # Therefore, try adding the flag to CMAKE_REQUIRED_FLAGS, which gets
- # added to both compiling and linking commands in the tests.
- cmake_push_check_state()
- set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${flag}")
- if(COMMAND check_compiler_flag)
- check_compiler_flag("${lang}" "" ${out_var})
- else()
- # Until the minimum CMAKE version is 3.19
- # cmake builtin compatible, except we assume lang is C or CXX
+ # cmake builtin compatible, except we assume lang is C or CXX
+ function(llvm_check_compiler_linker_flag lang flag out_var)
+ cmake_policy(PUSH)
+ cmake_policy(SET CMP0056 NEW)
+ set(_CMAKE_EXE_LINKER_FLAGS_SAVE ${CMAKE_EXE_LINKER_FLAGS})
+ set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${flag}")
if("${lang}" STREQUAL "C")
check_c_compiler_flag("" ${out_var})
elseif("${lang}" STREQUAL "CXX")
@@ -30,6 +22,7 @@ function(llvm_check_compiler_linker_flag lang flag out_var)
else()
message(FATAL_ERROR "\"${lang}\" is not C or CXX")
endif()
- endif()
- cmake_pop_check_state()
-endfunction()
+ set(CMAKE_EXE_LINKER_FLAGS ${_CMAKE_EXE_LINKER_FLAGS_SAVE})
+ cmake_policy(POP)
+ endfunction()
+endif()