[all-commits] [llvm/llvm-project] c1e78e: Reland "[clang][modules-driver] Add support for C+...

[Naveen Seth Hanig via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c1e78ed3d603923a077899b32341647904d9007f
      https://github.com/llvm/llvm-project/commit/c1e78ed3d603923a077899b32341647904d9007f
  Author: Naveen Seth Hanig <naveen.hanig at outlook.com>
  Date:   2026-04-28 (Tue, 28 Apr 2026)

  Changed paths:
    M clang/include/clang/Basic/DiagnosticDriverKinds.td
    M clang/include/clang/Driver/ModulesDriver.h
    M clang/lib/Driver/Driver.cpp
    M clang/lib/Driver/ModulesDriver.cpp
    A clang/test/Driver/modules-driver-both-modules-types.cpp
    A clang/test/Driver/modules-driver-cxx-modules-only.cpp
    A clang/test/Driver/modules-driver-import-std.cpp
    A clang/test/Driver/modules-driver-incompatible-options.cpp

  Log Message:
  -----------
  Reland "[clang][modules-driver] Add support for C++ named modules and import std" (2nd attempt) (#194475)

This reverts #193857 and relands #193312.

This adds basic support for explicit C++ named module builds, managed
natively by the Clang driver, including support for use of the Standard
library modules. This follows #187606, which adds the same for Clang
modules.

Current limitations:
- Standard library modules are still compiled to object files instead of
using the provided shared library. (This will be addressed in a
follow-up soon.)
- Caching is not supported yet (but likely to be added during the
upcoming GSoC cycle).
- Importing C++ standard library modules into Clang modules is not
supported (and not expected in the near term).

RFC:

https://discourse.llvm.org/t/rfc-modules-support-simple-c-20-modules-use-from-the-clang-driver-without-a-build-system



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