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# 16923da2 13-Jan-2025 xtex <xtex@envs.net>

Revert "[clang] Canonicalize absolute paths in dependency file" (#121638)

Reverts llvm/llvm-project#117458

https://github.com/llvm/llvm-project/pull/117458#issuecomment-2568804774

https://gith

Revert "[clang] Canonicalize absolute paths in dependency file" (#121638)

Reverts llvm/llvm-project#117458

https://github.com/llvm/llvm-project/pull/117458#issuecomment-2568804774

https://github.com/ninja-build/ninja/issues/2528

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# ca2ab748 01-Jan-2025 xtex <xtex@envs.net>

[clang] Canonicalize absolute paths in dependency file (#117458)

This fixes #117438.

If paths in dependency file are not absoulte, make (or ninja) will
canonicalize them.
While their canonicali

[clang] Canonicalize absolute paths in dependency file (#117458)

This fixes #117438.

If paths in dependency file are not absoulte, make (or ninja) will
canonicalize them.
While their canonicalization does not involves symbolic links expansion
(for IO performance concerns), leaving a non-absolute path in dependency
file may lead to unexpected canonicalization.
For example, '/a/../b', where '/a' is a symlink to '/c/d', it should be
'/c/b' but make (and ninja) canonicalizes it as '/b', and fails for file
not found.

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# 210f0e88 01-May-2018 Volodymyr Sapsai <vsapsai@apple.com>

Track skipped files in dependency scanning.

It's possible for a header to be a symlink to another header. In this
case both will be represented by clang::FileEntry with the same UID and
they'll use

Track skipped files in dependency scanning.

It's possible for a header to be a symlink to another header. In this
case both will be represented by clang::FileEntry with the same UID and
they'll use the same clang::HeaderFileInfo.

If you include both headers and use some single-inclusion mechanism
like a header guard or #import, one header will get a FileChanged
callback, and another FileSkipped.

So that we get an accurate dependency file, we therefore need to also
implement the FileSkipped callback in dependency scanning.

Patch by Pete Cooper.

Reviewers: bruno, pete

Reviewed By: bruno

Subscribers: cfe-commits, jkorous, vsapsai

Differential Revision: https://reviews.llvm.org/D30881

llvm-svn: 331319

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