Re: bakefile fails on Snow Leopard

On Oct 6, 2009, at 2:50 PM, Kevin Ollivier wrote:

>
> For my case (32-bit Python on SnowLeopard), I fixed the problem by  
> setting CC="gcc-4.0" and CXX="g++-4.0" before building Bakefile. 32- 
> bit is the default for that version of the compiler.

To clarify a bit:

If (and only if) you have installed Snow Leopard on a 64-bit-capable  
Mac (core2duo or xeon, but not core duo), the default compiler is  
gcc-4.2.0 and it defaults to arch x86_64.

There are several ways to coerce 32-bit compilation: You can specify  
by any number of ways of coercing 32-bit compilation: As Kevin said,  
gcc-4.0 (also provided by DevTools) defaults to 32-bit compilation.  
Including -arch i386 or -m32 in CFLAGS, CXXFLAGS, OBJCFLAGS, and  
LDFLAGS will coerce any Apple gcc to 32-bit (non-Apple gccs don't  
understand the -arch flag; they also don't understand Frameworks). I  
think that if you specify one of the older SDKs (10.5 or 10.4u) you'll  
get 32bit compilation by default, but I haven't tested that. (Note  
that you can specify -arch i386 -arch x86_64 and get a universal  
binary that can link either way as needed.)

/usr/bin/python is a universal binary of version 2.6.1, containing 32- 
bit ppc, 32-bit i386, and 64-bit x86_64 architectures. On a 64-bit  
machine, x86_64 is the default, but there are several ways to change  
it; man python has the details. There are of course several ways to  
install and use a custom python as well. The important thing to  
remember is that all loadable compiled-and-linked modules must have  
available the selected architecture that python is launched with.

Regards,
John Ralls


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