[all-commits] [llvm/llvm-project] 421d2e: [OpenMP] Fix ambiguous namespace lookup with delay...

[Harrison Hao via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 421d2e88e4f08f39a4bd48b9591c62d1145ec0ac
      https://github.com/llvm/llvm-project/commit/421d2e88e4f08f39a4bd48b9591c62d1145ec0ac
  Author: Harrison Hao <57025411+harrisonGPU at users.noreply.github.com>
  Date:   2026-07-30 (Thu, 30 Jul 2026)

  Changed paths:
    M llvm/include/llvm/Frontend/OpenMP/ConstructDecompositionT.h

  Log Message:
  -----------
  [OpenMP] Fix ambiguous namespace lookup with delayed template parsing (#212720)

Running `check-llvm` on Windows fails while compiling LLVMFrontendTests
with the following error:

  error: reference to 'detail' is ambiguous

Clang enables delayed template parsing by default when targeting the
MSVC ABI on Windows. When ConstructDecompositionT is instantiated after
a using-directive for `llvm::omp`, both `::detail` and
`llvm::omp::detail` are
visible, making `detail::find_unique` ambiguous.

Explicitly qualify find_unique with the global namespace. This fixes
check-llvm on Windows and other environments using
-fdelayed-template-parsing, without changing behavior.



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