[all-commits] [llvm/llvm-project] 2868e2: Use cmake to find perl executable (#91275)

[Matthias Braun via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 2868e26d0a6f257d3a8f303c7918f37c690e35a4
      https://github.com/llvm/llvm-project/commit/2868e26d0a6f257d3a8f303c7918f37c690e35a4
  Author: Matthias Braun <matze at braunis.de>
  Date:   2024-05-08 (Wed, 08 May 2024)

  Changed paths:
    M clang/CMakeLists.txt
    M clang/test/Analysis/scan-build/deduplication.test
    M clang/test/Analysis/scan-build/exclude_directories.test
    M clang/test/Analysis/scan-build/help.test
    M clang/test/Analysis/scan-build/html_output.test
    M clang/test/Analysis/scan-build/lit.local.cfg
    M clang/test/Analysis/scan-build/plist_html_output.test
    M clang/test/Analysis/scan-build/plist_output.test
    M clang/test/Analysis/scan-build/rebuild_index/rebuild_index.test
    M clang/test/Analysis/scan-build/silence-core-checkers.test
    M clang/test/lit.site.cfg.py.in

  Log Message:
  -----------
  Use cmake to find perl executable (#91275)

`clang/tools/scan-build` is implemented in `perl`. However given `perl`
is not mentioned as a required dependency in `GettingStarted.rst` we
should make this optional.

This adds a `find_package(Perl)` check to cmake and disables the
`scan-build` tests when no perl executable is found.

Ideally we would also check if dependent perl modules like `Hash::Util`
are present on the system, but I don't see any pre-existing cmake macros
to easily test this. So for now I go with a plain check for the `perl`
package, at least this allows to use `cmake
-DCMAKE_DISABLE_FIND_PACKAGE_Perl=ON` to manually disable `perl` and the
tests.



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