[PATCH] [compiler-rt] atos and dladdr symbolizers for OS X

[Kuba Brecka]

> Do you have a good understanding of why we need to use one code to run llvm-symbolizer on Mac and different code (forkpty etc.) to run atos on Mac? Can we instead make certain bits of StartSymbolizerProcess() platform-specific?


The reason to use forkpty is because `atos` doesn't flush its output fd after it gives a response.  So using regular pipes doesn't work here, because the response gets buffered within the C library.  To disable this, we make a new pseudo-terminal which makes all output from atos unbuffered.  This is not a problem for llvm-symbolizer, because it does a outs().flush() after each response.


http://reviews.llvm.org/D6588

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