[all-commits] [llvm/llvm-project] f8d8dc: [Support] Treat Windows "NUL" as the null device i...

[Wenju He via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f8d8dc1f864fa887f949418a2ebb58e1a0d239b8
      https://github.com/llvm/llvm-project/commit/f8d8dc1f864fa887f949418a2ebb58e1a0d239b8
  Author: Wenju He <wenju.he at intel.com>
  Date:   2026-07-15 (Wed, 15 Jul 2026)

  Changed paths:
    M llvm/lib/Support/raw_ostream.cpp
    M llvm/unittests/Support/raw_ostream_test.cpp

  Log Message:
  -----------
  [Support] Treat Windows "NUL" as the null device in writeToOutput (#208179)

llvm-objcopy (via writeToOutput) only special-cased "/dev/null", so on
Windows an output path of "NUL" fell through to TempFile::create() +
rename. Windows reserves "NUL" as a device name, so the rename fails
with "permission denied". This broke clang-offload-bundler's SYCL fat
object step when the driver is invoked with `-o nul` in downstream test
https://github.com/intel/llvm/blob/sycl/sycl/test/include_deps/header_reach.cpp

Assisted by: Claude



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