llvm-project

7ab6d39a - [LLVM][CMake][MSVC] Wrap linker flags for ICX on Windows (#112680)

[LLVM][CMake][MSVC] Wrap linker flags for ICX on Windows (#112680) The Intel C++ Compiler (ICX) passes linker flags through the driver unlike MSVC and clang-cl, and therefore needs them to be prefixed with `/Qoption,link` (the equivalent of `-Wl,` for gcc on *nix). Use `LINKER:` prefix wherever supported by cmake, when that's not possible fall-back to `${CMAKE_CXX_LINKER_WRAPPER_FLAG}`. CMake replaces these with `/Qoption,link` for ICX and with the empty string for MSVC and clang-cl. For `target_link_libraries` neither `LINKER:` (not supported prior to CMake 3.32) nor `${CMAKE_CXX_LINKER_WRAPPER_FLAG}` (does not begin with `-` would be taken as a library name) works, use `-Qoption,link` directly within a conditional generator expression that we're linking with ICX. For MSVC and clang-cl no functional change is intended. Tested by compiling with ICX and setting `CMAKE_(EXE|SHARED|STATIC|MODULE)_LINKER_FLAGS_INIT` to `-Werror=unknown-argument`. RFC: https://discourse.llvm.org/t/rfc-cmake-linker-flags-need-wl-equivalent-for-intel-c-icx-on-windows/82446