[clang-format] Use proper flags for git diff-tree #155247
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From local testing, git diff-tree does not support three dot diffs correctly, instead expecting the --merge-base flag to be passed along with two commits. This patch updates the git-clang-format script to be correct. I don't think we ever ran into this issue before because we never ended up using it. For the PR code format job I believe we would just explicitly pass the merge base, completely bypassing the problem.
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@llvm/pr-subscribers-clang-format Author: Aiden Grossman (boomanaiden154) ChangesFrom local testing, git diff-tree does not support three dot diffs correctly, instead expecting the --merge-base flag to be passed along with two commits. From my reading, the documentation (https://git-scm.com/docs/git-diff-tree) also confirms this. This patch updates the git-clang-format script to be correct. I don't think we ever ran into this issue before because we never ended up using it. For the PR code format job I believe we would just explicitly pass the merge base, completely bypassing the problem. Full diff: https://github.com/llvm/llvm-project/pull/155247.diff 1 Files Affected:
diff --git a/clang/tools/clang-format/git-clang-format b/clang/tools/clang-format/git-clang-format
index e709803d9a3f1..fe2dd283d403e 100755
--- a/clang/tools/clang-format/git-clang-format
+++ b/clang/tools/clang-format/git-clang-format
@@ -419,7 +419,7 @@ def compute_diff(commits, files, staged, diff_common_commit):
if len(commits) == 2:
git_tool = "diff-tree"
if diff_common_commit:
- commits = [f"{commits[0]}...{commits[1]}"]
+ extra_args += ["--merge-base"]
elif staged:
extra_args += ["--cached"]
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owenca
approved these changes
Aug 26, 2025
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/cherry-pick f09986a |
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/pull-request #155466 |
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From local testing, git diff-tree does not support three dot diffs correctly, instead expecting the --merge-base flag to be passed along with two commits. From my reading, the documentation (https://git-scm.com/docs/git-diff-tree) also confirms this. This patch updates the git-clang-format script to be correct.
I don't think we ever ran into this issue before because we never ended up using it. For the PR code format job I believe we would just explicitly pass the merge base, completely bypassing the problem.