Re: Building things with setup.py

James Stroud schrieb:
I think I would like to know how to avoid or correct these sort of
issues in the future, which seem to be limited, for me at least, to
scipy and numpy, with the possible exception of MySQLdb and its
dependency on zlib. Ideally, I would like to understand exactly what
causes these errors in addition to knowing what I can do to correct them
in the future.

Let's take a specific failure, namely the line

/auto_nfs/data10/users/jstroud/Programs/bin/g77
-L/data10/users/jstroud/Programs/lib
-L/usr/lib/gcc-lib/i386-redhat-linux/3.2.3
build/temp.linux-i686-2.5/numpy/core/blasdot/_dotblas.o
-L/data10/users/jstroud/Programs/lib -lblas -lg2c -o
build/lib.linux-i686-2.5/numpy/core/_dotblas.so

This gives errors like

build/temp.linux-i686-2.5/numpy/core/blasdot/_dotblas.o(.text+0x758):numpy/core/blasdot/_dotblas.c:226:
undefined reference to `PyTuple_New'

That's not too surprising: this line tries to link the input
*as an executable program*, despite calling the output
_dotblas.so. In an executable program, all symbols need to
be defined; that's why it it complains about so many missing
symbols (including MAIN__ - which should never be missing
in a library). Even though adding python2.5.a to the linker
link makes these symbols appear, the result still won't
work, as you can't use an executable program file as if
it were a shared library.

Now, compare this to a succeeding build of a C extension
module,

gcc -pthread -shared -L/data10/users/jstroud/Programs/lib
-L/usr/lib/gcc-lib/i386-redhat-linux/3.2.3
-I/data10/users/jstroud/Programs/include
-I/data10/users/jstroud/Programs/qt/include -I/usr/include
-I/data10/users/jstroud/Programs/include/freetype2/freetype
build/temp.linux-i686-2.5/build/src.linux-i686-2.5/numpy/core/src/umathmodule.o
-lm -o build/lib.linux-i686-2.5/numpy/core/umath.so

Notice that this passes -shared to the compiler, requesting
construction of a shared library. This is the problem with
the g77 linker line; try invoking

/auto_nfs/data10/users/jstroud/Programs/bin/g77 -shared
-L/data10/users/jstroud/Programs/lib
-L/usr/lib/gcc-lib/i386-redhat-linux/3.2.3
build/temp.linux-i686-2.5/numpy/core/blasdot/_dotblas.o
-L/data10/users/jstroud/Programs/lib -lblas -lg2c -o
build/lib.linux-i686-2.5/numpy/core/_dotblas.so

manually (whether or not -pthread is also necessary
or supported for g77, I don't know). This should at least
make the complaints about missing symbols go away; you
should then see whether the resulting module can be
imported in Python.

If that solves the problem, the question is why the
-shared option isn't passed automatically; your setting
LDFLAGS might indeed be a cause.

Regards,
Martin
.

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