Windows: Support building with Clang using the GNU-like front end #895
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qmfrederik
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Aug 12, 2025
- Add version 6.2.1 of libdispatch - Support on Windows using the "native" Clang toolchain - see swiftlang/swift-corelibs-libdispatch#895
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compnerd
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Aug 12, 2025
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@swift-ci please test |
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Hi @compnerd the Windows build failure looks unrelated, should we retrigger the Windows build? |
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@swift-ci please test Windows platform |
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On Windows, the Clang compiler can run with the GNU-like front end, or with a MSVC-like front-end. In both cases, it will generate core which is compatible with the MSVC runtime.
The
CMAKE_C_SIMULATE_IDCMake variable relates to the runtime/binary compatibility is always set to MSVC.The
CMAKE_C_COMPILER_FRONTEND_VARIANTCMake variable relates to the front-end and can be used to differentiate between the GNU and MSVC front-end (command line syntax).Therefore, use
CMAKE_C_COMPILER_FRONTEND_VARIANT(instead ofCMAKE_C_SIMULATE_ID) to determine whether command line arguments should be passed using the MSVC or GNU syntax.This fixes compiling libdispatch on Windows using a "native" clang toolchain (e.g. clang instead of clang-cl).