On Sat, Jul 30, 2011 at 1:42 PM, Rajeev Singh <rajs2...@gmail.com> wrote:
> Hi,
>
> I have a script (say a.py) which uses a function written in fortran 90.
> Within the script I give the command to compile using -
>
> os.system('f2py -c PD_evolve.f90 -m PD_evolve')
>
> It works fine on my computer if I run the script using -
>
> python a.py
>
> However it doesn't work if I use -
>
> sage -python a.py
>
> and gives an error while compiling. The last lines of error message are -
>
> /usr/bin/gfortran -Wall
> /tmp/tmpBTbBKB/tmp/tmpBTbBKB/src.linux-i686-2.6/PD_evolvemodule.o
> /tmp/tmpBTbBKB/tmp/tmpBTbBKB/src.linux-i686-2.6/fortranobject.o
> /tmp/tmpBTbBKB/PD_evolve.o -L/home/rajeev/bin/sage/local/lib -lpython2.6
> -lgfortran -o ./PD_evolve.so
> /usr/lib/gcc/i486-linux-gnu/4.4.5/libgfortranbegin.a(fmain.o): In function
> `main':
> (.text+0x27): undefined reference to `MAIN__'
> collect2: ld returned 1 exit status
> /usr/lib/gcc/i486-linux-gnu/4.4.5/libgfortranbegin.a(fmain.o): In function
> `main':
> (.text+0x27): undefined reference to `MAIN__'
> collect2: ld returned 1 exit status
> error: Command "/usr/bin/gfortran -Wall
> /tmp/tmpBTbBKB/tmp/tmpBTbBKB/src.linux-i686-2.6/PD_evolvemodule.o
> /tmp/tmpBTbBKB/tmp/tmpBTbBKB/src.linux-i686-2.6/fortranobject.o
> /tmp/tmpBTbBKB/PD_evolve.o -L/home/rajeev/bin/sage/local/lib -lpython2.6
> -lgfortran -o ./PD_evolve.so" failed with exit status 1
>
> I have compiled sage4.6.2 from source on Debian squeeze. I hope it makes
> sense to ask this question here as the trouble is within sage.
>
> Rajeev
>
Hi,
Going through the source code of numpy.f2py.compile and fortran in sage, I
managed to get things working. The following code works just fine -
path = os.environ['SAGE_LOCAL']+'/bin/sage-g77_shared'
extra_args = '--f77exec=%s --f90exec=%s' %(path, path)
args = ' -c -m %s %s %s'%('PD_evolve', 'PD_evolve.f90', extra_args)
cmd = '%s -c "import numpy.f2py as f2py2e;f2py2e.main()" %s'
%(sys.executable,args)
os.system(cmd)
The other thing that worked was InlineFortran from sage.misc.inline_fortran
however it would compile the source every time I run the program, whereas
the above set of instructions create a .so file which can be imported
directly in future runs.
This is just for future reference.
Rajeev
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