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List:       gentoo-dev
Subject:    [gentoo-dev] gcc vs tcc
From:       Per Wigren <wigren () home ! se>
Date:       2002-11-29 17:41:12
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Is it OK to add dev-lang/tcc as a build-dependancy?
Compiling GOBO (http://www.gobosoft.com) with gcc 3.2.1 takes about 3 hours on 
my dual athlon 1.2Ghz with 512mb RAM...

Compare this:

oggy gexace # time gcc -O2 -o gexace-gcc gexace.c 
real	10m12.746s
user	9m33.227s
sys	0m4.897s
oggy gexace # time tcc -o gexace-tcc gexace.c 
real	0m1.353s
user	0m0.472s
sys	0m0.061s
oggy gexace # ls -l gexace-*
-rwxr-xr-x    1 root     root      1216938 Nov 29 18:27 gexace-gcc
-rwxr-xr-x    1 root     root       994200 Nov 29 18:27 gexace-tcc

It's almost silly! :)  I've done some just-for-fun benchmarking and found that 
tcc generates code about as fast as "gcc -O2", but is a little bit slower 
than "-O3" and even more so when adding things like "-fomit-frame-pointer" 
and "-ffast-math"... But the gobo-utilities are more I/O-intensive than 
CPU-intensive so it shouldn't matter much..

gexace is one of several huge (2mb+) .c-files that is part of gobo (generated 
by the eiffel-compiler).. Using tcc, compiling it will take about one minute 
while it takes 3 hours with gcc...

Regards,
Per Wigren


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