Re: [PATCH] Rename warn() to warning() to fix symbol conflicts on BSD and Mac OS

Junio C Hamano, Sat, Mar 31, 2007 10:15:31 +0200:

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I finally tracked down all the (albeit inconsequential) errors I was getting
on both OpenBSD and OSX.  It's the warn() function in usage.c.  There's
warn(3) in BSD-style distros.  It'd take a "great rename" to change it, but if
someone with better C skills than I have could do that, my linker and I would
appreciate it.

It was annoying to me, too, when I was doing some mergetool testing on
Mac OS X, so here's a fix.

I'd take this for now, but I wonder where we should stop. 

Glibc also has warn(3) - see err.h for example.
(why is it part of libc, I wonder...)