I have added code to my plug-in that uses nsCOMPtr and nsAutoString,
meaning that my plug-in must link with libxpcom.  However, I can't seem to
find the proper incantation to make this work. Invariably I see a message
like this one when starting the browser:

  LoadPlugin: failed to initialize shared library
  /usr/lib/mozilla/plugins/openvrml.so
  [/usr/lib/mozilla/plugins/openvrml.so: undefined symbol: _ZTI8nsString]


I'm linking my plug-in like this:

  g++ -shared -nostdlib
  /usr/lib/gcc-lib/i386-redhat-linux/3.3.3/../../../crti.o
  /usr/lib/gcc-lib/i386-redhat-linux/3.3.3/crtbeginS.o  .libs/openvrml.o
  .libs/vrmlbrowser.o  -Wl,--rpath
  -Wl,/home/braden/src/openvrml/openvrml.plugin-relurl/BUILD/src/libopenvrml/.libs
  -Wl,--rpath
  -Wl,/home/braden/src/openvrml/openvrml.plugin-relurl/BUILD/src/libopenvrml-gl/.libs
  -Wl,--rpath -Wl,/usr/local/lib -Wl,--rpath -Wl,/usr/lib/mozilla-1.6
  -L/usr/lib/gcc-lib/i386-redhat-linux/3.3.3/../../../ -L/usr/lib
  -L/usr/lib/mozilla-1.6 -lxpcom -lplds4 -lplc4 -lnspr4 -lpthread
  -L/usr/X11R6/lib /usr/lib/libgtkglext-x11-1.0.so
  /usr/lib/libgdkglext-x11-1.0.so -lGLU -lGL -lXmu -lXt -lSM -lICE
  -lgtk-x11-2.0 -lgdk-x11-2.0 -latk-1.0 -lgdk_pixbuf-2.0 -lpangoxft-1.0
  -lpangox-1.0 -lpango-1.0 -lgobject-2.0 -lgmodule-2.0 -ldl -lglib-2.0
  ../../src/libopenvrml/.libs/libopenvrml.so
  ../../src/libopenvrml-gl/.libs/libopenvrml-gl.so
  -L/usr/lib/gcc-lib/i386-redhat-linux/3.3.3
  -L/usr/lib/gcc-lib/i386-redhat-linux/3.3.3/../../.. -lstdc++ -lm -lc
  -lgcc_s /usr/lib/gcc-lib/i386-redhat-linux/3.3.3/crtendS.o
  /usr/lib/gcc-lib/i386-redhat-linux/3.3.3/../../../crtn.o
  -Wl,--export-dynamic -Wl,-soname -Wl,openvrml.so -o .libs/openvrml.so

Even adding an --rpath for the Mozilla lib--as above--directory doesn't
seem to help.

-- 
Braden McDaniel                           e-mail: <[EMAIL PROTECTED]>
<http://endoframe.com>                    Jabber: <[EMAIL PROTECTED]>

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