llvm-project

6520b21c - [DTLTO][LLVM] Integrated Distributed ThinLTO (DTLTO) (#127749)

[DTLTO][LLVM] Integrated Distributed ThinLTO (DTLTO) (#127749) This patch adds initial support for Integrated Distributed ThinLTO (DTLTO) in LLVM, which manages distribution internally during the traditional link step. This enables compatibility with any build system that supports in-process ThinLTO. In contrast, existing approaches to distributed ThinLTO, which split the thin-link (--thinlto-index-only), backend compilation, and final link into separate steps, require build system support, e.g. Bazel. This patch implements the core DTLTO mechanism, which enables delegation of ThinLTO backend jobs to an external process (the distributor). The distributor can then manage job distribution through systems like Incredibuild. A generic JSON interface is used to communicate with the distributor, allowing for the creation of new distributors (and thus integration with different distribution systems) without modifying LLVM. Please see llvm/docs/dtlto.rst for more details. RFC: https://discourse.llvm.org/t/rfc-integrated-distributed-thinlto/69641 Design Review: https://github.com/llvm/llvm-project/pull/126654