In D106876, we stopped serializing module map files that didn't affect compilation of the current module.
However, since each `SourceLocation` is simply an offset into `SourceManager`'s global buffer of concatenated input files in, these need to be adjusted during serialization. Otherwise, they can incorrectly point after the buffer or into subsequent input file.
This patch starts adjusting `SourceLocation`s, `FileID`s and other `SourceManager` offsets in `ASTWriter`.
Reviewed By: dexonsmith
Differential Revision: https://reviews.llvm.org/D136624
Since D106876, PCM files don't report module maps as input files unless they contributed to the compilation.
Reporting only module maps of (transitively) imported modules is not enough, though. For modules marked with `[no_undeclared_includes]`, other module maps affect the compilation by introducing anti-dependencies.
This patch makes sure such module maps are being reported as input files.
Depends on D120463.
Reviewed By: dexonsmith
Differential Revision: https://reviews.llvm.org/D120464
This patch simplifies a test that checks only used module map files are reported as input files in PCM files.
Instead of using opaque `diff`, this patch uses `clang -module-file-info` and `FileCheck` to verify this.
Reviewed By: dexonsmith
Differential Revision: https://reviews.llvm.org/D120463
Jan Svoboda