Hi list,

I'm trying to build LLVM/clang with musl and found that LLVM testsuite 
hangs on close-stderr.ll ("Test that the error handling when writing to 
stderr fails exits the program cleanly rather than aborting.").
Exact part is: `opt --reject-this-option 2>&-` (opt is "llvm .bc -> .bc 
modular optimizer and analysis printer").

On glibc this command exits with code 1, on musl it hangs. strace output 
can be found in the attached files.

Error output happens in:
https://github.com/llvm-mirror/llvm/blob/master/lib/Support/ErrorHandling.cpp#L64

and there some locking/cleanup happens just before exit(1):
https://github.com/llvm-mirror/llvm/blob/master/lib/Support/Unix/Signals.inc#L187
https://github.com/llvm-mirror/llvm/blob/master/lib/Support/Unix/Signals.inc#L119

Is it LLVM or musl issue?
Please tell if any additional info/ssh access/etc is needed for 
investigation.


//wbr ojab