[PATCH] D37882: ubsan: Unbreak ubsan_cxx runtime library on Windows.

[Peter Collingbourne via Phabricator via llvm-commits]

pcc created this revision.
Herald added subscribers: mgorny, kubamracek.

This was originally broken by r258744 which introduced a weak reference
from ubsan to ubsan_cxx, which of course does not work directly on
Windows. The fix is to use /alternatename to create a weak external
reference to ubsan_cxx.

Also fix the definition (and the name, so that we drop cached values)
of the cmake flag that controls whether to build ubsan_cxx. Now the
user-controllable flag is always on, and we turn it off internally
depending on whether we support building it.


https://reviews.llvm.org/D37882

Files:
  compiler-rt/CMakeLists.txt
  compiler-rt/lib/ubsan/ubsan_handlers.cc
  compiler-rt/lib/ubsan/ubsan_handlers.h
  compiler-rt/lib/ubsan/ubsan_handlers_cxx.cc
  compiler-rt/test/cfi/target_uninstrumented.cpp
  compiler-rt/test/ubsan/TestCases/TypeCheck/PR33221.cpp
  compiler-rt/test/ubsan/TestCases/TypeCheck/vptr-non-unique-typeinfo.cpp
  compiler-rt/test/ubsan/TestCases/TypeCheck/vptr-virtual-base-construction.cpp
  compiler-rt/test/ubsan/TestCases/TypeCheck/vptr-virtual-base.cpp
  compiler-rt/test/ubsan/TestCases/TypeCheck/vptr.cpp

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