The 'gcc' project is the source for the default compiler. The
'gcc_os' project is the source for the compiler that compiles the
operating system.
For Tiger, 'gcc' is gcc-4.0, and 'gcc_os' is gcc-3.3. 'gcc_os_35' is
gcc-3.5 and was used to compile a very limited set of system
components that have ppc64 support. gcc-3.5 did not ship with Tiger,
and ppc64 apps that you compile should be compiled with gcc-4.0.
For Panther, 'gcc' is gcc-3.3 and 'gcc_os' is gcc-3.1.
For Jaguar, 'gcc' is gcc-2.95.2 and 'gcc3' is gcc-3.1.
For Puma and Cheetah there was only gcc-2.95.2.
There's no "correct" one to use in all circumstances, but the general
rule is that you should use the default compiler for a system, and
only switch back to an older version if your application would not
otherwise be backward compatible with a previous OS release. If
you're compiling Darwin projects that you want to use to replace
existing OS components, use the gcc_os compiler.
I can't speak for how long any of these will be supported, but the
trend from the releases mentioned above is that each release contains
a new default compiler, and the default compiler from the previous
release becomes gcc_os.
- Kevin
On Jul 26, 2005, at 10:28 PM, John Davidorff Pell wrote:
The recent question about building gccfast reminded me of some
confusion I've had recently.
What are the different gcc modules? What's the diff between gcc,
gcc_os, gcc_os_35, and gccfast? Which is the fastest? Which is the
most recent? Which is the most correct? What happened to gcc 2.9?
Which one is gcc 3.1, 3.3, and 4.0? How long will each be supported?
Lastly, for someone building their own, which one is the best choice?
Thanx,
JP
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