Macos – How to compile a library in 32bit on a 64bit Mac machine (Mountain Lion)

32-bitbuildmacosmakefileosx-mountain-lion

I want to compile tesseract http://code.google.com/p/tesseract-ocr/ in 32bit on my Macbook. But I have a 64bit Mac OS Mountain Lion machine.

There is a Makefile, and I tried:

(1) $ ./configure –with-arch=i386
(2) $ $./configure –build=i386-apple-darwin –host=i386-apple-darwin –target=i386-apple-darwin

Both didn't work. The library compiled is still 64bit. Actually for (2) I see, after running the ./configure, it says somethings like "checking for i386-apple-darwin-g++ .. no", actually everything it checked for i386 had a "no" in the end. But the compilation succeed, just the library does not seem to be 32bit.

Anyone can help with this?

Best Answer

Try the -m32 to specify building 32-bit executables in the CFLAGS and CXXFLAGS. However, the MacOSX sdks for 10.7 and 10.8 don't have 32-bit i386 code to link against (only MacOSX10.6.sdk). I recommend using macports to install/build the tesseract engine on Mac OS X 10.7+.

Related Solutions

Python – How to determine if the python shell is executing in 32bit or 64bit

One way is to look at sys.maxsize as documented here:

$ python-32 -c 'import sys;print("%x" % sys.maxsize, sys.maxsize > 2**32)'
('7fffffff', False)
$ python-64 -c 'import sys;print("%x" % sys.maxsize, sys.maxsize > 2**32)'
('7fffffffffffffff', True)

sys.maxsize was introduced in Python 2.6. If you need a test for older systems, this slightly more complicated test should work on all Python 2 and 3 releases:

$ python-32 -c 'import struct;print( 8 * struct.calcsize("P"))'
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$ python-64 -c 'import struct;print( 8 * struct.calcsize("P"))'
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BTW, you might be tempted to use platform.architecture() for this. Unfortunately, its results are not always reliable, particularly in the case of OS X universal binaries.

$ arch -x86_64 /usr/bin/python2.6 -c 'import sys,platform; print platform.architecture()[0], sys.maxsize > 2**32'
64bit True
$ arch -i386 /usr/bin/python2.6 -c 'import sys,platform; print platform.architecture()[0], sys.maxsize > 2**32'
64bit False

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