[PATCH] D116975: [OpenMP] Initial Implementation of LTO and bitcode linking in linker wrapper

[Joseph Huber via Phabricator via cfe-commits]

jhuber6 created this revision.
jhuber6 added reviewers: jdoerfert, gregrodgers, JonChesterfield, ronlieb.
Herald added subscribers: guansong, hiraditya, inglorion, yaxunl, mgorny.
jhuber6 requested review of this revision.
Herald added subscribers: llvm-commits, cfe-commits, sstefan1.
Herald added projects: clang, LLVM.

This patch implements the fist support for handling LTO in the
offloading pipeline. The flag `-foffload-lto` is used to control if
bitcode is embedded into the device. If bitcode is found in the device,
the extracted files will be sent to the LTO pipeline to be linked and
sent to the backend. This implementation does not separately link the
device bitcode libraries yet.

Depends on D116675 <https://reviews.llvm.org/D116675>


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D116975

Files:
  clang/lib/Driver/Driver.cpp
  clang/lib/Driver/ToolChains/Clang.cpp
  clang/tools/clang-linker-wrapper/CMakeLists.txt
  clang/tools/clang-linker-wrapper/ClangLinkerWrapper.cpp
  llvm/lib/Passes/PassBuilderPipelines.cpp

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