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Nicholas Bishop e5cc550554 Import modified copy of MultiplexExternalSemaSource and drop LLVM patch (#7405 )

Copy MultiplexExternalSemaSource.h and MultiplexExternalSemaSource.cpp
from https://github.com/llvm/llvm-project/pull/204458 into
third_party/llvm, and apply a few minor changes to allow them to compile
and pass precommit checks.

This allows
`0011-Add-empty-constructor-and-GetSources-method-to-Multi.patch` to be
removed, which brings Carbon closer to being able to compile on an
unmodified LLVM toolchain.

2026-06-22 19:42:52 +00:00

BUILD

Import modified copy of MultiplexExternalSemaSource and drop LLVM patch (#7405 )

2026-06-22 19:42:52 +00:00

clang_cc1.cpp

Add a hack to support -cc1as. (#7083 )

2026-04-21 20:33:58 +00:00

clang_cc1.h

Add a hack to support -cc1as. (#7083 )

2026-04-21 20:33:58 +00:00

multiplex_external_sema_source.cpp

Import modified copy of MultiplexExternalSemaSource and drop LLVM patch (#7405 )

2026-06-22 19:42:52 +00:00

multiplex_external_sema_source.h

Import modified copy of MultiplexExternalSemaSource and drop LLVM patch (#7405 )

2026-06-22 19:42:52 +00:00

README.md

Extract the CC1 logic to third_party location (#6405 )

2025-11-20 05:13:05 +00:00

README.md

Extracted LLVM code

This directory holds code extracted from the LLVM project and used in various places in Carbon. This mostly happens when some logic isn't readily exposed in a library-suitable API, or needs excessive customization.

We separate the baseline code and customizations here as these are really derived from the LLVM project. However, both Carbon and LLVM use the same license, so linking these isn't a problem. We also use the standard Carbon banner at the top of these files as the license is accurate and the collection and arrangement of the code are part of Carbon. The code itself should be assumed to be derived from LLVM.

Whenever possible, we should eventually refactor the upstream code until the logic can be exposed and then we can depend on it rather than extracting it here.