[all-commits] [llvm/llvm-project] ee68f6: Second try: [clang][cmake] Add options to pass in ...

[Han Zhu via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ee68f612ba682ddb911c5621e63df56039ec5824
      https://github.com/llvm/llvm-project/commit/ee68f612ba682ddb911c5621e63df56039ec5824
  Author: Han Zhu <zhuhan7737 at gmail.com>
  Date:   2023-04-17 (Mon, 17 Apr 2023)

  Changed paths:
    M clang/lib/Basic/CMakeLists.txt
    M llvm/cmake/modules/GenerateVersionFromVCS.cmake

  Log Message:
  -----------
  Second try: [clang][cmake] Add options to pass in vcs repo and revision info

V2: Fix cmake error when -DLLVM_APPEND_VC_REV=OFF

Clang may be built in an environment where Git is not available. In our case,
Clang is part of a larger monorepo which is not Git-based, and
GenerateVersionFromVCS was not able to get source info.

Provide options to pass in repo and revision info from cmake.
```
cmake \
  -DCLANG_VC_REPOSITORY=abc://repo.url.com \
  -DCLANG_VC_REVISION=abcd1234 \
  ...
```
This would allow us to prepare the source info beforehand and pass it to the
clang binary.

Differential Revision: https://reviews.llvm.org/D148262