On Jun 13, 2007, at 10:13, William Gallafent wrote:
I've successfully installed gcc42 on this i386 machine, and it works fine for creating i386 binaries. Now I want to make a version which creates ppc binaries.
Can't gcc already do that out of the box? I don't know, I've never tried with the plain (non-Apple) gcc, I'm just asking.
In an ideal world, I'd like one which works in the same way as Apple's gcc, allowing the "-arch ppc" and "-arch i386" flags, but I understand that this would be difficult to achieve from GCC mainline, so I'm happy to have two separate compiler builds, perhaps with a different prefix, if there is no smarter solution.
Ah. I also didn't realize that was an Apple extension.
So, is there a straightforward way to have two versions of gcc42 from macports installed on this same machine, one targetting i386 and one ppc? In a sense, one is a cross-compiler, with host=i386-apple-darwin8, target=powerpc-apple-darwin8.
MacPorts, or at least the gcc portfiles, currently don't provide a way to do that.
What does the "universal" variant of gcc42 do? I'm not interested in having compiler binaries for ppc, just in creating ppc output from the compiler, so I suspect this is not for me.
+universal is a generic variant available to all ports. It works for simple ports based on autoconf. gcc42 is far from simple, so +universal probably explodes everywhere for it.
Is there anything I need to consider when targetting Mac OS 10.3.9 with a compiler built in this way? I'm aware of "MACOS_DEPLOYMENT_TARGET=10.3" ... do I also need --with-sysroot=/Developer/SDKs/MacOSX10.3.9.sdk or anything else similar? Isn't Mac OS X.3.9 powerpc-apple-darwin7, rather than darwin8? Does this matter?
No idea.
Pointers to relevant documentation would be welcome!
If you can figure out how to build gcc such that it can create universal binaries, or such that it cross-compiles (though I thought it already could), then we can adapt the MacPorts portfiles to install gcc in that way. But discovering whether and how gcc supports that is probably a question best asked on the gcc list.
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