[PATCH] D18170: [CUDA][OpenMP] Create generic offload toolchains

[Samuel Antao via cfe-commits]

sfantao created this revision.
sfantao added reviewers: ABataev, jlebar, tra, echristo, hfinkel.
sfantao added subscribers: caomhin, carlo.bertolli, arpith-jacob, cfe-commits.

This patch introduces the concept of offloading tool chain and offloading kind. Each tool chain may have associated an offloading kind that marks it as used in a given programming model that requires offloading. 

It also adds the logic to iterate on the tool chains based on the kind. Currently, only CUDA is supported, but in general a programming model (an offloading kind) may have associated multiple tool chains that require supporting offloading.

This patch does not add tests - its goal is to keep the existing functionality.

This patch is the first of a series of three that attempts to make the current support of CUDA more generic and easier to extend to other programming models, namely OpenMP. It tries to capture the suggestions/improvements/concerns on the initial proposal in  http://lists.llvm.org/pipermail/cfe-dev/2016-February/047547.html. It only tackles the more consensual part of the proposal, i.e.does not address the problem of intermediate files bundling yet.

http://reviews.llvm.org/D18170

Files:
  include/clang/Driver/Action.h
  include/clang/Driver/Compilation.h
  include/clang/Driver/Driver.h
  lib/Driver/Compilation.cpp
  lib/Driver/Driver.cpp
  lib/Driver/Tools.cpp

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