beanz added a comment.

@zaks.anna, changing the build system to explicitly select which sanitizer 
runtime to use is more complicated than it might seem. The sanitizer runtime 
libraries are named differently by toolchain, so correctly selecting a library 
would involve either duplicating complicated compiler driver logic, or invoking 
the compiler to get it to report which library it would use. Both of which are 
fragile.

If the build system needs to work around this, it can, but it would be much 
better if we didn't need to.


https://reviews.llvm.org/D24048



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