Akim Demaille wrote:
Ah, OK, didn't think about that, thanks! Then in that case I
suppose that there are means to tell /usr/bin/gcc-4.0 what arch I'm
aiming for (686, ppc, or universal). I suppose via something like -
march. In which case, it's even better than using the fully
qualified compiler: /usr/bin/gcc-4.0 with the appropriate flags
allows to build for the three cases.
But apparently in the default mode it compiles for the build
machine, which is not what I need. So I guess the question is
rather: do I have a means to tell /usr/bin/gcc-4.0 via
macports.conf the set of archs I want to compile for?
-march and -mtune set which machine you want to aim the optimizations
for
-arch and -m32/-m64 set which architectural platform you want to
compile for
And when you are done instructing GCC, you also need to tell the other
parts of the build system what the platform is - for instance
configure...
There are some hacks in configure and universal for setting these,
but they don't have really a simple configuration for cross-compiling.
The default MacPorts setup is to compile everything locally only,
so building for other machines is something of an after-thought...
--anders
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