[PATCH] D24826: [LTO] Add -flto-jobs=N to control backend parallelism

[Teresa Johnson via cfe-commits]

tejohnson created this revision.
tejohnson added a reviewer: mehdi_amini.
tejohnson added a subscriber: cfe-commits.
Herald added a subscriber: mehdi_amini.

Currently, a linker option must be used to control the backend
parallelism of ThinLTO or full LTO (where it only applies to
parallel code gen). The linker option varies depending on the
linker (e.g. gold vs ld64). Add a new clang option -flto-jobs=N
to control this.

I've added in the wiring to pass this to the gold plugin. I also
added in the logic to pass this down in the form I understand that
ld64 uses on MacOS, for the darwin target.

https://reviews.llvm.org/D24826

Files:
  include/clang/Driver/Options.td
  lib/Driver/Tools.cpp
  test/Driver/lto-jobs.c

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