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cmake ..\llvm-project\llvm -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_PROJECTS="clang;lldb;lld;llvm" -DLLVM_ENABLE_ASSERTIONS=ON -DCMAKE_C_FLAGS="-fms-compatibility-version=19.14" -DCMAKE_CXX_FLAGS="-fms-compatibility-version=19.20" -DCMAKE_TRY_COMPILE_CONFIGURATION=Release -DLLVM_DEFAULT_TARGET_TRIPLE="arm64-pc-windows-msvc" -G Ninja |
Some specifics:
Wwe We need the “
-fms-compatibility-version" flag to have clang-cl pretend to be a newer MSVC, especially if that clang-cl is a prior release to the clang you’re compiling. If this value is too low than cmake will tell you what it should be, just set it to that.Known issue with cmake 3.21.1, it builds all try_compile/try_run as debug even if you select release mode. This is why we set “-DCMAKE_TRY_COMPILE_CONFIGURATION=Release”. Not doing so causes a try_run to fail to get error message strings, so lit defaults to Linux strings and many tests will fail.
We set LLVM_DEFAULT_TARGET_TRIPLE manually because the prompt we use is an x86 32 bit host prompt. There is no arm64 to arm64 prompt, so cmake detects the host/default target triple “correctly” but it’s not what we really want.
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