[all-commits] [llvm/llvm-project] 6c0e60: [C++20][Modules][HU 1/5] Introduce header units as...

[iains via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6c0e60e884a20016ccc0d7c7e6f06df089a0de86
      https://github.com/llvm/llvm-project/commit/6c0e60e884a20016ccc0d7c7e6f06df089a0de86
  Author: Iain Sandoe <iain at sandoe.co.uk>
  Date:   2022-03-25 (Fri, 25 Mar 2022)

  Changed paths:
    M clang/include/clang/Basic/LangOptions.def
    M clang/include/clang/Basic/LangOptions.h
    M clang/include/clang/Basic/Module.h
    M clang/include/clang/Driver/Options.td
    M clang/include/clang/Frontend/FrontendActions.h
    M clang/include/clang/Frontend/FrontendOptions.h
    M clang/include/clang/Lex/ModuleMap.h
    M clang/include/clang/Sema/Sema.h
    M clang/lib/AST/Decl.cpp
    M clang/lib/Frontend/CompilerInvocation.cpp
    M clang/lib/Frontend/FrontendActions.cpp
    M clang/lib/FrontendTool/ExecuteCompilerInvocation.cpp
    M clang/lib/Lex/ModuleMap.cpp
    M clang/lib/Parse/Parser.cpp
    M clang/lib/Sema/Sema.cpp
    M clang/lib/Sema/SemaModule.cpp
    A clang/test/Modules/cxx20-hu-01.cpp

  Log Message:
  -----------
  [C++20][Modules][HU 1/5] Introduce header units as a module type.

This is the first in a series of patches that introduce C++20 importable
header units.

These differ from clang header modules in that:
 (a) they are identifiable by an internal name
 (b) they represent the top level source for a single header - although
     that might include or import other headers.

We name importable header units with the path by which they are specified
(although that need not be the absolute path for the file).

So "foo/bar.h" would have a name "foo/bar.h".  Header units are made a
separate module type so that we can deal with diagnosing places where they
are permitted but a named module is not.

Differential Revision: https://reviews.llvm.org/D121095