[Numpy-discussion] building 32 bit numpy on 64 bit linux

[Julian Taylor]

On 12.12.2013 19:58, David Jones wrote:
> I'm trying to compile 32-bit numpy on a 64 bit Centos 6 system, but fails with the message:
> 
> "Broken toolchain: cannot link a simple C program"
> 
> It get's the compile flags right, but not the linker:
> 
> C compiler: gcc -pthread -fno-strict-aliasing -g -O2 -m32 -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -fPIC
> compile options: '-Inumpy/core/src/private -Inumpy/core/src -Inumpy/core -Inumpy/core/src/npymath -Inumpy/core/src/multiarray -Inumpy/core/src/umath -Inumpy/core/src/npysort -Inumpy/core/include -I/opt/python/ia32/include/python2.7 -c'
> gcc: _configtest.c
> gcc -pthread _configtest.o -o _configtest
> _configtest.o: could not read symbols: File in wrong format
> collect2: ld returned 1 exit status
> 
> I'm bulding it using a 32bit python build that I compiled on the same system.
> 
> I tried:
> 
>    OPT="-m32" FOPT="-m32" python setup.py build
> 
> and
> 
>    setarch x86_64 -B python setup.py build
> 
> But with the same results.
> 
> 
> Someone worked around this by altering ccompiler.py, but I'm trying to find a cleaner solution.
> 
> See:http://stackoverflow.com/questions/11265057/how-do-i-install-a-32-bit-version-of-numpy
> 
> Is there a standard way of doing this?
> 

this might work:

CC="gcc -m32" LDSHARED="gcc -m32" FF="gfortran -m32" linux32 python
setup.py build