[PATCH] D38565: [lit] Improve the ToolSubst class a bit

[Zachary Turner via Phabricator via llvm-commits]

zturner created this revision.
Herald added a reviewer: modocache.

In a separate patch, I'm working on re-working clang and lld's lit config's to call a common `use_clang` and `use_lld` functions, respectively.  Making this work and be generic enough that it also supports `debuginfo-test`'s use case requires a little bit more power in how we specify a tool substitution.  For example, `lld` doesn't prefix its tool substitutions with `%`, but clang does.  And `debuginfo-tests` shouldn't fail if `lld` can't be found, but obviously `lld` should.

This patch adds the necessary bits to make this possible.

It also renames `ToolFilter` to `ToolSubst`, and moves it to its own file, to avoid a cyclic dependency between `__init__.py` and the other files in the same module.


https://reviews.llvm.org/D38565

Files:
  clang/test/lit.cfg.py
  lld/test/lit.cfg.py
  llvm/test/lit.cfg.py
  llvm/utils/lit/lit/llvm/__init__.py
  llvm/utils/lit/lit/llvm/config.py
  llvm/utils/lit/lit/llvm/subst.py

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