How do I determine the target architecture of static library (.a) on Mac OS X?

Question

I'm interested in verifying if a given iPhone static library has been built for ARM or Intel.

It's more curiosity than anything. Is there some kind of Mac OS X or BSD specific tool to do this? This post gives an example in Linux.

Answer 1

Another option is lipo; its output is brief and more readable than otool's.

An example:

% lipo -info /usr/lib/libiodbc.a 
Architectures in the fat file: /usr/lib/libiodbc.a are: x86_64 i386 ppc
% lipo -info libnonfatarchive.a
input file libnonfatarchive.a is not a fat file
Non-fat file: libnonfatarchive.a is architecture: i386
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