Support for asan/tsan/ubsan on Apple builds on OS X crosstool

[rahul-malik]

ATTENTION! Please read and follow:

• if this is a question about how to build / test / query / deploy using Bazel, ask it on StackOverflow instead: https://stackoverflow.com/questions/tagged/bazel
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• if this is a bug or feature request, fill the form below as best as you can.

Description of the problem / feature request:

Add “features” in OS X crosstool to enable usage of TSAN, UBSAN and ASAN. There have begun api changes in rules_apple but they are not functional until the crosstool supports these features

Feature requests: what underlying problem are you trying to solve with this feature?

I would like to run tests using clang sanitizers.

Bugs: what's the simplest, easiest way to reproduce this bug? Please provide a minimal example if possible.

This is a feature request. You cannot specify a “feature” from the CLI for this currently.

What operating system are you running Bazel on?

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What's the output of bazel info release?

0.12.0rc2

What's the output of git remote get-url origin ; git rev-parse master ; git rev-parse HEAD ?

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Have you found anything relevant by searching the web?

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Places to look:

• StackOverflow: http://stackoverflow.com/questions/tagged/bazel
• GitHub issues: https://github.com/bazelbuild/bazel/issues
• email threads on https://groups.google.com/forum/#!forum/bazel-discuss

Any other information, logs, or outputs that you want to share?

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If the files are large, upload as attachment or provide link.

[hlopko]

@sergiocampama @trybka

[keith]

#12772