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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.

These are both polyfills for check_linker_flag which was introduced in CMake 3.18 and now that LLVM requires CMake 3.20 as the minimum version we can use it to simplify our build.

These have the same purposes but two different implementations.are both polyfills for check_linker_flag which was introduced in llvm_check_compiler_linker_flag usCMake 3.18 and now that LLVM requires CMAKE_REQUIRED_FLAGS which affectsake 3.20 as the minimum version 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 implementationwe can use it to simplify our build.