KDE sources now blacklist gcc 4.0.0 because it miscompiles KDE but that shouldn't be
a reason to do no compilation benchmarks, or? 
My test machine was an Athlon XP
2600+ with 512MB and SUSE 9.3's gcc 3.3.5. The other gcc versions were pure gcc.
My first test was to compile Qt 3.3.4:
-O0 -O2
gcc 3.3.5 23m40 31m38
gcc 3.4.3 22m47 28m45
gcc 4.0.0 13m16 19m23
Next I compiled kdelibs/HEAD with --enable-final and unsermake -j 2:
-O0 -O2
gcc 3.3.5 14m44 27m28
gcc 3.4.3 14m49 27m03
gcc 4.0.0 9m54 23m30
Finally the usual development case, same as above without --enable-final:
-O0
gcc 3.3.5 32m56
gcc 3.4.3 32m49
gcc 4.0.0 15m15
I really like gcc 4.0's -O0 compilation speed improvement. After the Subversion
switch (latest rumor this weekend) I will certainly start to use gcc 4.0.1 or a
recent snapshot. Let us hope that gcc 4.1 keeps the optimization promises for
generated code the same way.
Emerging question: When will we see "unsertool" replacing the slow-going libtool?
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> KDE sources now blacklist g
> KDE sources now blacklist gcc 4.0.0 because it miscompiles KDE...
Is this KDEs or GCCs failure?
How could it be KDE's failure
How could it be KDE's failure?
Conceivably the code could us
Conceivably the code could use deprecated/now-obsoleted features.
Then the compilation would ha
Then the compilation would have to fail and not silently produce broken code.
Indeed, if that's not the cas
Indeed, if that's not the case then it's certainly GCC's fault.
wow
The prospect of 50% less time waiting for my compiles to finish while developing is too good to be true! I have high hopes now and Arch has gcc 4 in testing...
Runtime
Have you tried any benchmarks of runtime performance of the different compilers? If GCC 4.0 really makes faster binaries, that's more important to the end-user.
Re: Runtime
No, I didn't try. gcc runtime performance is not annoying me and guess most people neither. Likely it's faster by some percent but not the same magnitude.
Application start performance and binary size whereas are better with gcc 4.0 because it allows KDE to prevent unnecessary exported symbols.
wow those are some interestin
wow those are some interesting results, cause seems like most of the complaints I hear against gcc is that each release it takes longer and longer to compile stuff, but obviously thats not the case here