It looks like clang has added a warning to detect infinite recursion and I'm 
seeing the failure here:

https://github.com/tianocore/edk2/blob/master/StdLib/LibC/StdLib/Environs.c#L123
void
_Exit(int status)
{
  gMD->ExitValue = status;          // Save our exit status.  Allows a status 
of 0.
  longjmp(gMD->MainExit, 0x55);     // Get out of here.  longjmp can't return 
0. Use 0x55 for a non-zero value.

#ifdef __GNUC__
  _Exit(status);        /* Keep GCC happy - never reached */
#endif
}

This is the compiler warning. 

error: all paths through this function will call itself 
[-Werror,-Winfinite-recursion]

I fixed by replacing the infinite recursion with UNREACHABLE() but I'm not sure 
what the rules are changing this chunk of code? 

Thanks,

Andrew Fish

https://github.com/tianocore/edk2/issues/109


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