[PATCH] D59109: Add --unwindlib=[libgcc|compiler-rt] to parallel --rtlib= [take 2]

[Sterling Augustine via Phabricator via llvm-commits]

saugustine created this revision.
Herald added subscribers: llvm-commits, jdoerfert, aheejin, mgorny, dberris, srhines.
Herald added a project: LLVM.

"clang++ hello.cc --rtlib=compiler-rt"

now can works without specifying additional unwind or exception
handling libraries.

This reworked version of the feature no longer modifies today's default
unwind library for compiler-rt: which is nothing. Rather, a user
can specify -DCLANG_DEFAULT_UNWINDLIB=compiler-rt when configuring
the compiler.

This should address the issues from the previous version.

Update tests for new --unwindlib semantics.


Repository:
  rL LLVM

https://reviews.llvm.org/D59109

Files:
  clang/CMakeLists.txt
  clang/include/clang/Basic/DiagnosticDriverKinds.td
  clang/include/clang/Config/config.h.cmake
  clang/include/clang/Driver/Options.td
  clang/include/clang/Driver/ToolChain.h
  clang/lib/Driver/ToolChain.cpp
  clang/lib/Driver/ToolChains/CommonArgs.cpp
  clang/test/Driver/compiler-rt-unwind.c

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