forked from OSchip/llvm-project
7873d822f7
Summary: When searching for Git version control information, libBasic's CMake checks for the path '.git/logs/HEAD'. However, when LLVM is included as a Git submodule, this path does not exist. Instead, it contains a '.git' file with the following: ``` gitdir: ../../.git/modules/external/llvm ``` Where '../..' is the relative path to the root repository that contains the LLVM Git submodule. Because of this discrepancy, `clang --version` does not output source control information if built from a Git submodule. To fix, check whether '.git' is a directory or a file. If it's a directory, simply use the '.git/logs/HEAD' path. If it's a file, read it and check for the tell-tale sign of a Git submodule: the text "gitdir:". If it exists, follow that path and use the 'logs/HEAD' at that location instead. This allows not only the correct revision information to be retrieved, but also uses a file that will change with each source control revision. Test Plan: 1. Before applying this change, build Clang as a Git submodule in a repository that places it in external/clang, and confirm no revision information is output when `clang --version` is invoked (just "clang 5.0.0" is output, no Git hashes). 2. Apply these changes and build Clang as a Git repository nested under llvm/tools/clang, and confirm that `clang --version` displays correct version information. 3. Apply these changes and build Clang as a Git submodule using the structure described in (1), and confirm version control information is output as in (2). Reviewers: jordan_rose, beanz, probinson Reviewed By: jordan_rose Subscribers: chapuni, mgorny, cfe-commits Differential Revision: https://reviews.llvm.org/D34955 llvm-svn: 308205 |
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|---|---|---|
| clang | ||
| clang-tools-extra | ||
| compiler-rt | ||
| debuginfo-tests | ||
| libclc | ||
| libcxx | ||
| libcxxabi | ||
| libunwind | ||
| lld | ||
| lldb | ||
| llgo | ||
| llvm | ||
| openmp | ||
| parallel-libs | ||
| polly | ||