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Export LLVM_VERSION_MAJOR CMake variable as a directory property (#83346)

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This allows users who include `llvm-project` as a subrepository to
access the `LLVM_VERSION_MAJOR` variable on par with if they were
relying on an installed LLVM and `FindLLVM.cmake`. They just need to do
something like:

```
  get_directory_property(LLVM_VERSION_MAJOR DIRECTORY "third_party/llvm-project/llvm" LLVM_VERSION_MAJOR)
```

Context: https://github.com/openxla/iree/pull/16606 -- like other
projects with similar needs that I found by some googling, our
work-around had been to rely on the CMake cached variable
`CLANG_EXECUTABLE_VERSION`. Being cached, it over time inevitably ended
up having a wrong value.
This commit is contained in:
Benoit Jacob 2024-03-05 09:59:28 -05:00 committed by GitHub
parent a64975f966
commit fac791d4e1
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2
llvm/CMakeLists.txt
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@ -28,6 +28,8 @@ if(NOT DEFINED LLVM_VERSION_SUFFIX)
set(LLVM_VERSION_SUFFIX git)
endif()
set_directory_properties(PROPERTIES LLVM_VERSION_MAJOR "${LLVM_VERSION_MAJOR}")
if (NOT PACKAGE_VERSION)
set(PACKAGE_VERSION
"${LLVM_VERSION_MAJOR}.${LLVM_VERSION_MINOR}.${LLVM_VERSION_PATCH}${LLVM_VERSION_SUFFIX}")