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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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