Re: [igraph] python-igraph OSX Lion install errors

[Bedartha Goswami]

Hi Tamas, 

I tried adding the "-arch i386" parts to the export CC commands but I still 
get: 

/usr/local/lib/libigraph.0.dylib: Mach-O 64-bit dynamically linked shared 
library x86_64 

So I went to python.org and downloaded the 2.7.2 version (32/64 bit): 

Bedarthas-MacBook-Air:python-igraph-0.5.4 bedartha$ python
Python 2.7.2 (v2.7.2:8527427914a2, Jun 11 2011, 15:22:34)
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin 

and repeated the commands. But the error remains the same - only that the 
"gcc-4.0" phrase is replaced with "gcc-4.2": 

gcc-4.2 -fno-strict-aliasing -fno-common -dynamic -isysroot 
/Developer/SDKs/MacOSX10.6.sdk -arch i386 -arch x86_64 -g -O2 -DNDEBUG -g 
-O3 -I/usr/local/include -I/usr/local/include -I/usr/include 
-I/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c 
src/arpackobject.c -o build/temp.macosx-10.6-intel-2.7/src/arpackobject.o
unable to execute gcc-4.2: No such file or directory
error: command 'gcc-4.2' failed with exit status 1 

I checked that I have no other version of gcc other than llvm-gcc-4.2 and 
i686-apple-darwin11-llvm-gcc-4.2 (located in /usr/llvm-gcc-4.2/bin/) - the 
rest are all aliases. (There are no aliases called "gcc-4.2" or "gcc-4.0". 
I tried creating an alias for "gcc-4.0" which could not fool the build 
program.) 

So effectively I tried: 

export CC="llvm-gcc-4.2 -arch i386"
export CXX="llvm-g++-4.2 -arch i386"
export FFLAGS=-ff2c
export MACOSX_DEPLOYMENT_TARGET=10.7 

as well as:
export CC="gcc-4.2 -arch i386"
export CXX="g++-4.2 -arch i386"
export FFLAGS=-ff2c
export MACOSX_DEPLOYMENT_TARGET=10.7 

after i installed the new python 2.7 - but its not working.
(attached is the text from the shell). 

I am sorry that this is dragging out like this, and I really appreciate 
your prompt replies and interest. 

Thanking you once more, 

Regards,
Bedartha 



Tamas Nepusz writes: 

> Hi, 
>
> > I am using the Python distribution from python.org because earlier, while 
> > installing scipy and mat plotlib, it turned out that the Mac OS pythons are 
> > not preferable.
> Yes, you're right, as far as I know the installers for SciPy and Matplotlib
> are created for the Python distribution from python.org. I'm using the
> system Python on my Mac and I'm testing the Python interface with that so I
> have little experience with Python from python.org. Anyway, we'll try to
> figure this out. 
>
> The way I see it, the problem is that Python from python.org is built with
> the 32-bit version of gcc-4.0. When building a C extension module, Python
> will try to use the same compiler version and options that Python itself was
> built with. Since Mac OS X Lion does not include gcc-4.0 any more, the
> default install script fails for igraph. *Sometimes* you can get around this
> by tricking Python into using llvm-gcc-4.2 (this is the "export CC="
> trickery that you did). Sometimes it does not work. The error message you
> see implies that it does not work in your case. 
>
> First, I'd try "export CC=gcc-4.2; export CXX=g++-4.2". These are the
> "non-LLVM" versions of gcc and they are hopefully more compatible with
> python.org's Python than llvm-gcc. So, try building the Python interface
> after "export CC=gcc-4.2; export CXX=g++-4.2". If it fails, try going back
> to python.org and download a combined 64-bit/32-bit Python installer ("Mac
> OS X 64-bit/32-bit x86-64/i386 Installer (2.7.2) for Mac OS X 10.6 and
> 10.7"). Chances are that this version was compiled with a newer gcc, most
> likely gcc-4.2, so it would probabily solve your problem. However, before
> doing this, you have to make sure that you have compiled the C core of
> igraph for the i386 architecture! The easiest way to check this is as follows: 
>
> $ file /usr/local/lib/libigraph.0.dylib 
>
> If it says "i386" somewhere in the output, then you are okay. If it says
> "x86_64", then your igraph library is currently compiled for 64-bit
> architectures, so you have to go back to compiling the C core as follows: 
>
> export CC="gcc-4.2 -arch i386"
> export CXX="g++-4.2 -arch i386"
> ./configure
> make
> make install 
>
> Hope this helps. 
>
> Cheers,
> Tamas 
>
> _______________________________________________
> igraph-help mailing list
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> https://lists.nongnu.org/mailman/listinfo/igraph-help

install-python-igraph-ext-OSXLion_4
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