#17605: "How to call C code from Sage" thematic tutorial
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Reporter: | Owner:
ncohen | Status: needs_review
Type: | Milestone: sage-6.5
enhancement | Resolution:
Priority: major | Merged in:
Component: | Reviewers:
documentation | Work issues:
Keywords: | Commit:
Authors: | a84624002490417b18adb6534a1c73843822306e
Nathann Cohen | Stopgaps:
Report Upstream: N/A |
Branch: |
public/17605 |
Dependencies: |
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Comment (by ncohen):
Hello Volker,
> You can link compiled C/C++ code with a stand-alone Cython project like
in https://github.com/vbraun/lattice_phi4. Then just import as module in
Sage.
I tried it but I was not able to compile it. It seems that I am missing
some headers.
I kept on whipping my test files and go to something new, though: I was
able to make it work provided that I copied libdoublevector.so to
SAGE_ROOT/local/lib/.
Now, I am trying to make it all run from my working directory but I meet
the following problem:
- When calling "%runfile double_vector_sage.pyx" there are two calls to
GCC
- The one which contains -ldoublevector is not the one that contains
-L/home/ncohen/a
As a result the second call always fails, because the library is not
found.
{{{
sage: %runfile double_vector_sage.pyx
Compiling ./double_vector_sage.pyx...
...
RuntimeError: Error compiling ./double_vector_sage.pyx:
running build
running build_ext
building '_home_ncohen_a_double_vector_sage_pyx_5' extension
gcc -fno-strict-aliasing -g -O2 -DNDEBUG -g -fwrapv -O3 -Wall -fPIC
-I/home/ncohen/.Sage/local/include/csage
-I/home/ncohen/.Sage/local/include
-I/home/ncohen/.Sage/local/include/python2.7
-I/home/ncohen/.Sage/local/lib/python/site-packages/numpy/core/include
-I/home/ncohen/.Sage/src/sage/ext -I/home/ncohen/.Sage/src
-I/home/ncohen/.Sage/src/sage/gsl -I.
-I/home/ncohen/.Sage/local/include/python2.7
-c _home_ncohen_a_double_vector_sage_pyx_5.c
-o build/temp.linux-x86_64-2.7/_home_ncohen_a_double_vector_sage_pyx_5.o
-w -O2 -L/home/ncohen/a/
gcc -pthread -shared -L/home/ncohen/.Sage/local/lib build/temp.linux-
x86_64-2.7/_home_ncohen_a_double_vector_sage_pyx_5.o
-L/home/ncohen/.Sage/local/lib/ -L/home/ncohen/.Sage/local/lib
-ldoublevector
-lmpfr -lgmp -lgmpxx -lstdc++ -lpari -lm -lec -lgsl -lgslcblas -latlas
-lntl
-lcsage -lpython2.7 -o build/lib.linux-
x86_64-2.7/_home_ncohen_a_double_vector_sage_pyx_5.so
-L/home/ncohen/.Sage/local/lib
}}}
The header of my .pyx file is:
{{{
#clib doublevector
#cargs -L/home/ncohen/a/
}}}
Thanks to you if you can give me some hint. In the meantime I'll be trying
again to make it work.
Nathann
--
Ticket URL: <http://trac.sagemath.org/ticket/17605#comment:9>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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