[PyQt] SIP hello world problem

Pim Schellart P.Schellart at student.science.ru.nl
Fri Apr 17 12:24:09 BST 2009

Dear Users/Developers,

I would like to combine some C++ code with my Python programs.
I have looked at several options:
- Boost
- Swig
and of course SIP.
SIP seems to be best suited to my goal but when building a simple  
hello world program I ran into the following problem:

c++ -c -pipe -fPIC -Os -Wall -W -I. -I/Applications/scisoft/i386/ 
library/Frameworks/Python.framework/Versions/2.5/include/python2.5 -o  
siphellocmodule.o siphellocmodule.cpp
c++ -c -pipe -fPIC -Os -Wall -W -I. -I/Applications/scisoft/i386/ 
library/Frameworks/Python.framework/Versions/2.5/include/python2.5 -o  
siphelloHello.o siphelloHello.cpp
c++ -headerpad_max_install_names -bundle -F/Applications/scisoft//i386/ 
library/Frameworks -framework Python -o hello.so siphellocmodule.o  
siphelloHello.o -lhello
ld: library not found for -lhello
collect2: ld returned 1 exit status
make: *** [hello.so] Error 1

Does anyone know what is going wrong here?

The program consists of a header file hello.h:
class Hello
     void print();

a source file hello.cpp:
#include <iostream>
#include "hello.h"

void Hello::print()
     std::cout<<"Hello world!"<<std::endl;

A SIP definition file (or whatever it is called) hello.sip:
%Module hello 0

class Hello
#include <hello.h>

     void print();

And finally the configure.py file:
import os
import sipconfig

# The name of the SIP build file generated by SIP and used by the build
# system.
build_file = "hello.sbf"

# Get the SIP configuration information.
config = sipconfig.Configuration()

# Run SIP to generate the code.
os.system(" ".join([config.sip_bin, "-c", ".", "-b", build_file,  

# Create the Makefile.
makefile = sipconfig.SIPModuleMakefile(config, build_file)

# Add the library we are wrapping.  The name doesn't include any  
# specific prefixes or extensions (e.g. the "lib" prefix on UNIX, or the
# ".dll" extension on Windows).
makefile.extra_libs = ["hello"]

# Generate the Makefile itself.

The generated Makefile looks like:
TARGET = hello.so
OFILES = siphellocmodule.o siphelloHello.o
HFILES = sipAPIhello.h

CC = cc
CXX = c++
LINK = c++
CPPFLAGS = -I. -I/Applications/scisoft/i386/library/Frameworks/ 
CFLAGS = -pipe -fPIC -Os -Wall -W
CXXFLAGS = -pipe -fPIC -Os -Wall -W
LFLAGS = -headerpad_max_install_names -bundle -F/Applications/scisoft// 
i386/library/Frameworks -framework Python
LIBS = -lhello
.SUFFIXES: .c .o .cpp .cc .cxx .C

	$(CXX) -c $(CXXFLAGS) $(CPPFLAGS) -o $@ $<

	$(CXX) -c $(CXXFLAGS) $(CPPFLAGS) -o $@ $<

	$(CXX) -c $(CXXFLAGS) $(CPPFLAGS) -o $@ $<

	$(CXX) -c $(CXXFLAGS) $(CPPFLAGS) -o $@ $<

	$(CC) -c $(CFLAGS) $(CPPFLAGS) -o $@ $<



install: $(TARGET)
	@test -d $(DESTDIR)/Applications/scisoft/i386/library/Frameworks/ 
Python.framework/Versions/2.5/lib/python2.5/site-packages || mkdir -p $ 
	cp -f $(TARGET) $(DESTDIR)/Applications/scisoft/i386/library/ 

	-rm -f $(TARGET)
	-rm -f siphellocmodule.o
	-rm -f siphelloHello.o

Any help would be much appreciated.

Kind regards,

Pim Schellart

P.S. The SIP tool looks great but I cant seem to find any good  
documentation. The reference guide starts OK but then turns into a  
summing up of keywords. If anyone knows some decent documentation I  
would like to have the link. Otherwise setting up a wiki with this  
kind of info might be a good idea.
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