[LLVMdev] Cross-compiling LLVM on Mac OS X

Eric Christopher echristo at apple.com
Mon Dec 21 16:17:51 PST 2009

On Dec 21, 2009, at 3:39 PM, Rob Rix wrote:

>> Anyhow, Rob, best bet is to just use -arch to build everything up. lipo knows what needs to happen.
> Unfortunately that doesn’t appear to be enough; using -arch in CFLAGS (and CXXFLAGS) and not using --build or --host builds for x86_64 no matter what you specify for the architecture (in my case, the documented i386 and ppc).
> The full command I’m using is as follows:
> CFLAGS="-arch $cpu -isysroot /Developer/SDKs/MacOSX10.5.sdk/ -mmacosx-version-min=10.5" CXXFLAGS="-arch $cpu -isysroot /Developer/SDKs/MacOSX10.5.sdk/ -mmacosx-version-min=10.5" ./configure --enable-optimized --enable-jit --enable-targets=x86,x86_64,powerpc
> $cpu is i386 or ppc.
> The configure script’s output says, near the top:
> checking target architecture... x86_64
> So it seems that the Makefile is preferring the configure script’s reckoning to the CFLAGS/CXXFLAGS variables at present.

configure really doesn't know about it. It's still the target architecture. You'll just be adding more. 

Let the build go and see where you get.  Also, you need more than a single -arch flag. As I said before -arch ppc -arch i386 -arch x86_64.

Daniel's comments are also good.


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