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 * libclang_rt-san-* is sanitizer_common, and is linked in only if no other
   sanitizer runtime is present.
 * libclang_rt-ubsan-* is the piece of the runtime which doesn't depend on
   a C++ ABI library, and is always linked in.
 * libclang_rt-ubsan_cxx-* is the piece of the runtime which depends on a
   C++ ABI library, and is only linked in when linking a C++ binary.

This change also switches us to using -whole-archive for the ubsan runtime
(which is made possible by the above split), and switches us to only linking
the sanitizer runtime into the main binary and not into DSOs (which is made
possible by using -whole-archive).

The motivation for this is to only link a single copy of sanitizer_common
into any binary. This is becoming important now because we want to share
more state between multiple sanitizers in the same process (for instance,
we want a single shared output mutex).

The Darwin ubsan runtime is unchanged; because we use a DSO there, we don't
need this complexity.


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UBSan: enable proper linking with UBsan runtime on Darwin. Turn on building ubsan on OS X in 'make' build system. Patch by Jean-Daniel Dupas.

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This lets one build ASan runtime for ARM/Android by running
make -C tools/clang/runtime/ \
  LLVM_ANDROID_TOOLCHAIN_DIR=/path/to/ndk/toolchain
in an existing build tree.


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See PR14013.



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Fixup for r165097: build 32-bit ASan compiler-rt library on 64-bit Linux only if just-built clang can build simple 32-bit executables

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Fixes http://code.google.com/p/address-sanitizer/issues/detail?id=113


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[tsan] add  ThreadSanitizer linker flags on Linux and also copy the tsan-rt into the appropriate place at build time

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the default for clang for some time now and can handle compiler-rt.

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Linux.
 - Currently just builds a full library, and only on x86, and only for the
   target arch.

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when cross compiling under the current organization.
 - See verbose comment for explanation, justification, and how to fix.

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Patch by Jean-Daniel Dupas!


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runtime/compiler-rt/Makefile paving the way to put multiple different libraries
into runtime/ and build all of them.


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did. Delete it.


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builds the subdirs from this directory. This makes the behaviour with make match
what already happens with cmake.


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bits for the runtime libraries.

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need any of the LLVM support libraries. Reviewed
by Daniel Dunbar.


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some projects still depend on ___eprintf being available.

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libc++ is checked out into llvm/projects.
 - WIP, not on by default yet.

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system CC.

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