[all-commits] [llvm/llvm-project] 8b11c3: [llvm-mt] Do not build llvm-mt if not functional (...

[Michael Kruse via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 8b11c39a0fad7f6ec48c323a0deeb3c103005200
      https://github.com/llvm/llvm-project/commit/8b11c39a0fad7f6ec48c323a0deeb3c103005200
  Author: Michael Kruse <llvm-project at meinersbur.de>
  Date:   2025-04-08 (Tue, 08 Apr 2025)

  Changed paths:
    M llvm/docs/CMake.rst
    M llvm/test/CMakeLists.txt
    M llvm/test/tools/llvm-mt/help.test
    M llvm/tools/llvm-mt/CMakeLists.txt

  Log Message:
  -----------
  [llvm-mt] Do not build llvm-mt if not functional (#134631)

llvm-mt requires libxml2 to work, so do not even build it without
libxml2.

CMake 3.31 and later prefer llvm-mt.exe over Microsoft's mt.exe if
available and using clang-cl.exe as CMAKE_CXX_COMPILER. When CMake picks
up llvm-mt.exe without libxml2, any build will fail with the message
```
llvm-mt: error: no libxml2
```

Any test except `--help` already uses `REQUIRES: libxml2`. There is no
point in having a non-functional executable. Not building llvm-mt.exe
will force CMake to use Microsoft's `mt.exe` instead.

Fixes: #134237



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