[LLVMdev] [llvm-commits] [PATCH] Allow per-thread re-direction of outs()/errs()

[Caldarale, Charles R]

> From: Justin Holewinski [mailto:justin.holewinski at gmail.com] 
> Subject: Re: [LLVMdev] [llvm-commits] [PATCH] Allow per-thread re-direction of outs()/errs()

> > Virtually all of those are in DEBUG statements or in llvm/tools.
> > Neither are relevant to the discussion.

> In a way, they are.  What if I want a debug trace in a multi-threaded 
> context?  Right now, all threads would just spew to the same stream 
> and the result would be unreadable.  If you allow threads to setup their 
> own outs() and errs() streams (transparently to the rest of LLVM), you 
> can intercept these as you see fit, perhaps dumping each to a separate 
> file.  I acknowledge that you could also enforce single-threaded execution
> for debug runs, but what if you are in the context of a library with no 
> valid stdout/stderr buffers?

I agree wholeheartedly.  We're running LLVM in a real-time system with no stdout/stderr, and being able to redirect the debug messages is critical to our testing.

 - Chuck


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