https://github.com/guillem-bartrina-sonarsource created
https://github.com/llvm/llvm-project/pull/139739
This reverts commit 05d613ea931b6de1b46dfe04b8e55285359047f4.
Only **one single** test has been added after the reverted patch that makes use
of the _functionality_ it introduced.
* The macro `%{/t:real}` in `case-insensitive-include-absolute.c` has been
replaced by the good ol' `%/t`.
Original discussion: https://reviews.llvm.org/D154130
---
Although it has been almost two years since the patch was merged and apparently
no major problems associated with it have arisen, we still believe that the
patch is _unsound_ overall.
**Rationale:**
The whole point of **canonical** paths is to be unique for a given entity
(directory or file), so that they can be directly compared to determine whether
or not two entities are the same.
This patch outright renders this fundamental property useless by allowing the
same entity to have more than one canonical path on a Windows machine,
depending on whether it is accessed via the real path or a substituted path.
And the only motivation behind these deceptively innocuous changes seems to be
to help circumvent a platform-dependent limitation (MAX_PATH on Windows) that
apparently makes it difficult for some users (?) to run on lit tests. This
limitation has workarounds (using directory junctions, enabling long paths or
using UNC) that do not require changing llvm at all but simply some settings on
the host machine. Furthermore, this limitation may no longer be relevant two
years later.
We also believe that the original patch was a bit incomplete. It indirectly
affected the resolution of canonical paths used by certain parts of other llvm
subsystems (module maps, frameworks, ...), and were not thoroughly tested for
regressions.
> In reality, it is not easy to find a regression in llvm itself because the
> fundamental property of canonical paths is not widely exploited, except in
> some form of caches. But it is certainly exploited by many of the “users” of
> llvm.
Also, some simplifications in the resolution of canonical paths in
`(Text|SARIF)Diagnostic.cpp` may have been overlooked.
But the biggest concern, aside from breaking the fundamental property, is that
the patch also inadvertently changes the way certain symbolic links are
resolved in Windows, particularly those between different drives. [If the path
contains a symbolic link to another drive, the absolute and real paths have
different drive letters, even though they are not substituted drives... ] This
behavior change is not documented in the patch description so it is definitely
a regression.
Finally, the last comment in the original discussion, which was posted after
the merge, also raised concerns about the changes introduced by the patch.
In summary, we believe that this patch is more detrimental than beneficial and
should be reverted.
_As for the original patch, it is not easy to create any kind of test for this
change in behavior. Since we are reverting a change, the need for tests is not
so relevant._
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