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From: CHENG Gao <chenggao@gmail.com>
Newsgroups: gmane.emacs.devel
Subject: Re: Emacs 22 Carbon+AppKit port and Emacs 23 Mac port
Date: Tue, 08 Sep 2009 18:38:03 +0800
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Out of curiosity, I tried to build Mac port (1.92) with clang, and found
it works well, while building 32bit ns port fails.

I compared building with gcc (4.2) and clang (on Snow Leopard), the
result is below:

1. With gcc 4.2

$time ./configure --with-mac

real	0m38.490s
user	0m8.163s
sys	0m10.563s

$time make -j3

real	2m21.291s
user	2m26.661s
sys	0m17.704s

2. With clang

$time CC='clang' ./configure --with-mac
real	0m20.890s
user	0m5.425s
sys	0m10.277s

$time make -j3
real	1m9.632s
user	1m33.100s
sys	0m13.372s

Seems clang is much faster than gcc.