[all-commits] [llvm/llvm-project] 45fd70: Reland [clang-cl] Add new option /pathmap:<from>=<...

[Vladimir Vereschaka via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 45fd70d800b6bdb7cae464bee3e78bd0d898ba5e
      https://github.com/llvm/llvm-project/commit/45fd70d800b6bdb7cae464bee3e78bd0d898ba5e
  Author: Vladimir Vereschaka <vvereschaka at accesssoftek.com>
  Date:   2026-06-09 (Tue, 09 Jun 2026)

  Changed paths:
    M clang/docs/ReleaseNotes.rst
    M clang/include/clang/Options/Options.td
    A clang/test/CodeGenCXX/cl-pathmap.cpp
    A clang/test/Driver/cl-pathmap.c
    A clang/test/Preprocessor/cl-pathmap.c

  Log Message:
  -----------
  Reland [clang-cl] Add new option /pathmap:<from>=<to> to replace the path prefix <from> with <to>. (#202830)

This option matches MSVC options and does the path substitution for the
file references in the preprocessor macros, debug and coverage
information.

This option acts as a clang's ``-ffile-prefix-map=value`` and with some
known differences in behavior with original CL's option that do not
affect the functionality:
* nomalizes the macro prefix map pathes -- removes `./` and uses the
target's
platform-specific path separator character when exanding the
preprocessor
macros -- ``-ffile-reproducible`` (but not the debug and coverage prefix
maps).
* does not require ``/experimental:deterministic`` as by MSVC. It needed
for
removing a hostname from a mangling hash gen, but clang-cl does not use
a hostname  when generates the hashes.

Known issues:
  * does not remap the pathes within PCH/PCM files.

Reland #198664



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