Fix lookup of header files in install-includes - #12310
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Header files named in `includes` and `install-includes` are now looked
up in the same set of directories everywhere, via the new
`Distribution.Simple.BuildPaths.includeSearchDirs`.
This fixes the following issues:
- A header at the package root (without any `include-dirs`) would not
be found when compiling C sources.
- Generated header files for sub-libraries and foreign libraries would
not be found (we looked under the component's build directory rather
than the package's).
- Absolute `include-dirs` entries were silently ignored when locating
`install-includes` files (haskell#11186).
Fixes haskell#11186
Co-Authored-By: Ilya Baryshnikov <zlonast3@gmail.com>
zlonast
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Sep 2, 2026
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Ticket: #11186.
Template Α: This PR modifies behaviour or interface
Include the following checklist in your PR:
This PR removes the hacky logic for computing the package root in terms of the
--cabal-fileflag (made obsolete by--working-dir), and cleans up the logic for searching include directories with the common functionDistribution.Simple.BuildPaths.includeSearchDirs.