[phobos] 64 & 32 bit libraries for OSX

[Martin Nowak]

On Wed, 09 Nov 2011 02:45:08 +0100, Walter Bright <walter at digitalmars.com>  
wrote:

> On Linux, the 64 bit and 32 bit libraries exist along separate paths,  
> and we put both paths on the command to the linker:
>
> DFLAGS=-I%@P%/../../src/phobos -I%@P%/../../src/druntime/import  
> -L-L%@P%/../lib32 -L-L%@P%/../lib64
> -L--no-warn-search-mismatch -L--export-dynamic
>
> However, attempting to do this on OSX fails (using -L-no_arch_warnings  
> instead of -L--no-warn-search-mismatch). It apparently always tries to  
> link in the first library found, not the first one with matching  
> architecture.
>
> What is the right way on OSX to do a dual-architecture library?
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Building two static libraries and merging them with lipo(1) should do the  
trick.