CODEWITHSUNDEEP
phpc++swig
Julien Deniau
Julien Deniau

Reputation: 5040

Unable to create PHP extension with swig

I am trying to generate a PHP extension of a C++ program (Simstring), but I am a little stucked.

The program already propose a python and a ruby extensions working with Swig.

I followed the Swig PHP documentation but I got an error.

Here is what I have done and the result I got, maybe you can help me with that: 

cd swig;
mkdir php;
ln -s ../export.cpp
ln -s ../export.h
ln -s ../export.i
swig -c++ -php -o export_wrap.cpp export.i
g++ `php-config --includes` -fPIC -c export_wrap.cpp
g++ -shared export_wrap.o -o simstring.so
sudo mv simstring.so my-php-extension-dir/

I load the extension in my php.ini but I got the following error : 

PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib/php5/20121212/simstring.so' - /usr/lib/php5/20121212/simstring.so: undefined symbol: _ZN6writer5closeEv in Unknown on line 0

Thanks a lot

Upvotes: 1

Views: 357

Answers (1)

Julien Deniau
Julien Deniau

Reputation: 5040

Thanks to @zaufi, I searched more and found the answer.

I was definitively missing a file.

The right commands are the followings (please note the export_wrap.cpp AND export.cpp resp. export.o AND export_wrap.o)

g++ `php-config --includes` -fPIC -c export_wrap.cpp export.cpp
g++ -shared export.o export_wrap.o -o simstring.so

For more informations, you have to "include" the simstring.php generated file.

Upvotes: 2

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