iains added inline comments.
================
Comment at: clang/include/clang/Serialization/ASTWriter.h:127-128
+ /// The module is a header unit.
+ bool IsHeaderUnit = false;
+
----------------
ChuanqiXu wrote:
> I think the member is redundant. I thought we could use
> `WritingModule->isHeaderUnit()` to replace it.
yeah we can do this - I added a "isHeaderUnit()" method to Module.h to do this.
================
Comment at: clang/lib/Serialization/ASTWriter.cpp:2358-2378
+ bool EmittedModuleMacros = false;
+ if (IsHeaderUnit) {
+ // This is for the main TU when it is a C++20 header unit.
+ // We preserve the final state of defined macros, and we do not emit ones
+ // that are undefined.
+ if (!MD || shouldIgnoreMacro(MD, IsModule, PP) ||
+ MD->getKind() == MacroDirective::MD_Undefine)
----------------
ChuanqiXu wrote:
> Is it possible to merge the implementation with the following for PCH? It
> looks like there are some redundancies.
Well, that was what I had originally, I actually split it out as it is now
because the difference in the logic around which macros are written out was
making the code pretty confusing to read. If there's a strong feeling about
this, perhaps we can see if there's some way to factor it (perhaps with some
place-holder vars).
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D121097/new/
https://reviews.llvm.org/D121097
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