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POLinux dynamic link error with wxWebConnect
 

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  1. POLinux dynamic link error with wxWebConnect
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    <p>I use and develop wxWebConnect and Python bindings for it (see <a href="http://github.com/jonmmorgan/wxwebconnect/" rel="nofollow">http://github.com/jonmmorgan/wxwebconnect/</a> and <a href="http://github.com/jonmmorgan/pywebconnect/" rel="nofollow">http://github.com/jonmmorgan/pywebconnect/</a>). These have built on Linux before. However, when support for XRC handlers was added Python programs crash when loading the .so file with the error:</p> <pre><code>undefined symbol: _ZN22wxWebControlXmlHandlerC1Ev </code></pre> <p>The library has been built and runs correctly on both Mac OS X and Windows since the change was made to support XRC.</p> <p>The cause of this problem seems to be that the constructor for the class wxWebControlXmlHandler (see <a href="https://github.com/jonmmorgan/wxwebconnect/blob/master/xh_webcontrol.cpp" rel="nofollow">https://github.com/jonmmorgan/wxwebconnect/blob/master/xh_webcontrol.cpp</a>) is not being included in the built shared object file. Running nm on xh_webcontrol.o shows that the symbol is in the text section of that object file, and that object file is one of the object files that is linked into the shared object. However, running nm on the shared object file shows that it is undefined, and that is what causes the crash.</p> <p>I can't understand why the constructor is not being included in the shared object file, since it is obviously required (and I know the constructor is invoked in webcontrol.cpp). Is there a good reason for this? Is there anything I can or should do to force the constructor to be included in the shared object file and exported?</p> <p><strong>Commands used to build (setuptools generated):</strong></p> <hr> <pre><code>gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fPIC -DSWIG_TYPE_TABLE=_wxPython_table -DSWIG_PYTHON_OUTPUT_TUPLE -DWXP_USE_THREAD=1 -UNDEBUG -D_FILE_OFFSET_BITS=64 -D_LARGE_FILES -D__WXGTK__ -Iinclude -Isrc -I/usr/lib/wx/include/gtk2-unicode-release-2.8 -I/usr/include/wx-2.8 -I/usr/include/gtk-2.0 -I/usr/lib/gtk-2.0/include -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/pango-1.0 -I/usr/include/gio-unix-2.0/ -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng12 -Icontrib/wc -Icontrib/wc/webconnect -I/usr/include/xulrunner-1.9.2.11 -I/usr/include/python2.6 -c contrib/wc/gtk/wc_wrap.cpp -o build-gtk2.unicode/temp.linux-i686-2.6/contrib/wc/gtk/wc_wrap.o -pthread -O3 -pthread gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fPIC -DSWIG_TYPE_TABLE=_wxPython_table -DSWIG_PYTHON_OUTPUT_TUPLE -DWXP_USE_THREAD=1 -UNDEBUG -D_FILE_OFFSET_BITS=64 -D_LARGE_FILES -D__WXGTK__ -Iinclude -Isrc -I/usr/lib/wx/include/gtk2-unicode-release-2.8 -I/usr/include/wx-2.8 -I/usr/include/gtk-2.0 -I/usr/lib/gtk-2.0/include -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/pango-1.0 -I/usr/include/gio-unix-2.0/ -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng12 -Icontrib/wc -Icontrib/wc/webconnect -I/usr/include/xulrunner-1.9.2.11 -I/usr/include/python2.6 -c contrib/wc/webconnect/dom.cpp -o build-gtk2.unicode/temp.linux-i686-2.6/contrib/wc/webconnect/dom.o -pthread -O3 -pthread gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fPIC -DSWIG_TYPE_TABLE=_wxPython_table -DSWIG_PYTHON_OUTPUT_TUPLE -DWXP_USE_THREAD=1 -UNDEBUG -D_FILE_OFFSET_BITS=64 -D_LARGE_FILES -D__WXGTK__ -Iinclude -Isrc -I/usr/lib/wx/include/gtk2-unicode-release-2.8 -I/usr/include/wx-2.8 -I/usr/include/gtk-2.0 -I/usr/lib/gtk-2.0/include -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/pango-1.0 -I/usr/include/gio-unix-2.0/ -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng12 -Icontrib/wc -Icontrib/wc/webconnect -I/usr/include/xulrunner-1.9.2.11 -I/usr/include/python2.6 -c contrib/wc/webconnect/nsimpl.cpp -o build-gtk2.unicode/temp.linux-i686-2.6/contrib/wc/webconnect/nsimpl.o -pthread -O3 -pthread gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fPIC -DSWIG_TYPE_TABLE=_wxPython_table -DSWIG_PYTHON_OUTPUT_TUPLE -DWXP_USE_THREAD=1 -UNDEBUG -D_FILE_OFFSET_BITS=64 -D_LARGE_FILES -D__WXGTK__ -Iinclude -Isrc -I/usr/lib/wx/include/gtk2-unicode-release-2.8 -I/usr/include/wx-2.8 -I/usr/include/gtk-2.0 -I/usr/lib/gtk-2.0/include -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/pango-1.0 -I/usr/include/gio-unix-2.0/ -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng12 -Icontrib/wc -Icontrib/wc/webconnect -I/usr/include/xulrunner-1.9.2.11 -I/usr/include/python2.6 -c contrib/wc/webconnect/promptservice.cpp -o build-gtk2.unicode/temp.linux-i686-2.6/contrib/wc/webconnect/promptservice.o -pthread -O3 -pthread gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fPIC -DSWIG_TYPE_TABLE=_wxPython_table -DSWIG_PYTHON_OUTPUT_TUPLE -DWXP_USE_THREAD=1 -UNDEBUG -D_FILE_OFFSET_BITS=64 -D_LARGE_FILES -D__WXGTK__ -Iinclude -Isrc -I/usr/lib/wx/include/gtk2-unicode-release-2.8 -I/usr/include/wx-2.8 -I/usr/include/gtk-2.0 -I/usr/lib/gtk-2.0/include -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/pango-1.0 -I/usr/include/gio-unix-2.0/ -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng12 -Icontrib/wc -Icontrib/wc/webconnect -I/usr/include/xulrunner-1.9.2.11 -I/usr/include/python2.6 -c contrib/wc/webconnect/protocolhandler.cpp -o build-gtk2.unicode/temp.linux-i686-2.6/contrib/wc/webconnect/protocolhandler.o -pthread -O3 -pthread gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fPIC -DSWIG_TYPE_TABLE=_wxPython_table -DSWIG_PYTHON_OUTPUT_TUPLE -DWXP_USE_THREAD=1 -UNDEBUG -D_FILE_OFFSET_BITS=64 -D_LARGE_FILES -D__WXGTK__ -Iinclude -Isrc -I/usr/lib/wx/include/gtk2-unicode-release-2.8 -I/usr/include/wx-2.8 -I/usr/include/gtk-2.0 -I/usr/lib/gtk-2.0/include -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/pango-1.0 -I/usr/include/gio-unix-2.0/ -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng12 -Icontrib/wc -Icontrib/wc/webconnect -I/usr/include/xulrunner-1.9.2.11 -I/usr/include/python2.6 -c contrib/wc/webconnect/webcontrol.cpp -o build-gtk2.unicode/temp.linux-i686-2.6/contrib/wc/webconnect/webcontrol.o -pthread -O3 -pthread gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fPIC -DSWIG_TYPE_TABLE=_wxPython_table -DSWIG_PYTHON_OUTPUT_TUPLE -DWXP_USE_THREAD=1 -UNDEBUG -D_FILE_OFFSET_BITS=64 -D_LARGE_FILES -D__WXGTK__ -Iinclude -Isrc -I/usr/lib/wx/include/gtk2-unicode-release-2.8 -I/usr/include/wx-2.8 -I/usr/include/gtk-2.0 -I/usr/lib/gtk-2.0/include -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/pango-1.0 -I/usr/include/gio-unix-2.0/ -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng12 -Icontrib/wc -Icontrib/wc/webconnect -I/usr/include/xulrunner-1.9.2.11 -I/usr/include/python2.6 -c contrib/wc/webconnect/webframe.cpp -o build-gtk2.unicode/temp.linux-i686-2.6/contrib/wc/webconnect/webframe.o -pthread -O3 -pthread gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fPIC -DSWIG_TYPE_TABLE=_wxPython_table -DSWIG_PYTHON_OUTPUT_TUPLE -DWXP_USE_THREAD=1 -UNDEBUG -D_FILE_OFFSET_BITS=64 -D_LARGE_FILES -D__WXGTK__ -Iinclude -Isrc -I/usr/lib/wx/include/gtk2-unicode-release-2.8 -I/usr/include/wx-2.8 -I/usr/include/gtk-2.0 -I/usr/lib/gtk-2.0/include -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/pango-1.0 -I/usr/include/gio-unix-2.0/ -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng12 -Icontrib/wc -Icontrib/wc/webconnect -I/usr/include/xulrunner-1.9.2.11 -I/usr/include/python2.6 -c contrib/wc/webconnect/webprefs.cpp -o build-gtk2.unicode/temp.linux-i686-2.6/contrib/wc/webconnect/webprefs.o -pthread -O3 -pthread gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fPIC -DSWIG_TYPE_TABLE=_wxPython_table -DSWIG_PYTHON_OUTPUT_TUPLE -DWXP_USE_THREAD=1 -UNDEBUG -D_FILE_OFFSET_BITS=64 -D_LARGE_FILES -D__WXGTK__ -Iinclude -Isrc -I/usr/lib/wx/include/gtk2-unicode-release-2.8 -I/usr/include/wx-2.8 -I/usr/include/gtk-2.0 -I/usr/lib/gtk-2.0/include -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/pango-1.0 -I/usr/include/gio-unix-2.0/ -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng12 -Icontrib/wc -Icontrib/wc/webconnect -I/usr/include/xulrunner-1.9.2.11 -I/usr/include/python2.6 -c contrib/wc/webconnect/xh_webcontrol.cpp -o build-gtk2.unicode/temp.linux-i686-2.6/contrib/wc/webconnect/xh_webcontrol.o -pthread -O3 -pthread gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fPIC -DSWIG_TYPE_TABLE=_wxPython_table -DSWIG_PYTHON_OUTPUT_TUPLE -DWXP_USE_THREAD=1 -UNDEBUG -D_FILE_OFFSET_BITS=64 -D_LARGE_FILES -D__WXGTK__ -Iinclude -Isrc -I/usr/lib/wx/include/gtk2-unicode-release-2.8 -I/usr/include/wx-2.8 -I/usr/include/gtk-2.0 -I/usr/lib/gtk-2.0/include -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/pango-1.0 -I/usr/include/gio-unix-2.0/ -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng12 -Icontrib/wc -Icontrib/wc/webconnect -I/usr/include/xulrunner-1.9.2.11 -I/usr/include/python2.6 -c contrib/wc/pyprotocolhandler.cpp -o build-gtk2.unicode/temp.linux-i686-2.6/contrib/wc/pyprotocolhandler.o -pthread -O3 -pthread g++ -pthread -shared -Wl,-O1 -Wl,-Bsymbolic-functions build-gtk2.unicode/temp.linux-i686-2.6/contrib/wc/gtk/wc_wrap.o build-gtk2.unicode/temp.linux-i686-2.6/contrib/wc/webconnect/dom.o build-gtk2.unicode/temp.linux-i686-2.6/contrib/wc/webconnect/nsimpl.o build-gtk2.unicode/temp.linux-i686-2.6/contrib/wc/webconnect/promptservice.o build-gtk2.unicode/temp.linux-i686-2.6/contrib/wc/webconnect/protocolhandler.o build-gtk2.unicode/temp.linux-i686-2.6/contrib/wc/webconnect/webcontrol.o build-gtk2.unicode/temp.linux-i686-2.6/contrib/wc/webconnect/webframe.o build-gtk2.unicode/temp.linux-i686-2.6/contrib/wc/webconnect/webprefs.o build-gtk2.unicode/temp.linux-i686-2.6/contrib/wc/webconnect/xh_webcontrol.o build-gtk2.unicode/temp.linux-i686-2.6/contrib/wc/pyprotocolhandler.o -L/usr/X11R6/lib -lwx_gtk2u_richtext-2.8 -lwx_gtk2u_aui-2.8 -lwx_gtk2u_xrc-2.8 -lwx_gtk2u_qa-2.8 -lwx_gtk2u_html-2.8 -lwx_gtk2u_adv-2.8 -lwx_gtk2u_core-2.8 -lwx_baseu_xml-2.8 -lwx_baseu_net-2.8 -lwx_baseu-2.8 -lwx_gtk2u_xrc-2.8 -o /home/jmmorgan/wxwebconnect/wxPython-src-2.8.11.0/wxPython/wx/_wc.so -pthread -Wl,-Bsymbolic-functions 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    1. COCould you show the makefile used for linking? I couldn't find one building shared library.
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    2. COI use Python setuptools. I will put in the commands it used.
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