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Date: Wed, 21 Sep 2005 14:22:45 +0200
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Subject: Re: Missing symbol upon loading module
From: david.olsson@vimio.com (David Olsson)

Nevermind. The config.m4 was messed up so that the module never linked 
against libstd++ which, of course, caused som missing symbols.

Best regards
David Olsson


David Olsson wrote:
> I have a PHP extension written in C++ which I use for parsing and 
> building WbXml documents. I have tested building and using it on a 32 
> bit x86 system running the following:
> 
> PHP 4.3.10
> GCC 3.3.5
> Gentoo Linux 2.6.10-r4
> 
> Everything works fine on this configuration. I do however need the 
> extension to run on a x86 64 bits machine using the following 
> configuration:
> 
> PHP 4.4.0
> GCC 3.2.3
> RedHat Enterprise Linux 3 2.4.21-15
> 
> Everything compiles fine, no errors. When PHP tries to load the module 
> however, I get the following error:
> 
> PHP Warning:  Unknown(): Unable to load dynamic library 
> '/usr/local/php4/extensions/php_wbxml.so' - 
> /usr/local/php4/extensions/php_wbxml.so: undefined symbol: 
> __gxx_personality_v0 in Unknown on line 0
> 
> The name of the module is, obviously, php_wbxml.so. What does this error 
> mean? I have tried to explicitly link against libsupc++ (which, from 
> what I can gather, should include the __gxx_personality_v0 symbol) but 
> the same error remains.
> 
> I have moved other modules without problems between the two systems but 
> this one doesn't seem to work.
> 
> Here's the config.m4 I am using:
> 
> PHP_ARG_ENABLE(php_wbxml, whether to enable WbXml support,
> [--enable-php_wbxml  Enable WbXml support])
> 
> if test "$PHP_PHP_WBXML" = "yes"; then
>     PHP_REQUIRE_CXX()
>     PHP_ADD_LIBRARY(stdc++, 1, PHP_WBXML_SHARED_LIBADD)
>     AC_DEFINE(HAVE_PHP_WBXML, 1, [whether you have WbXml])
>     PHP_NEW_EXTENSION(php_wbxml, php_wbxml.cpp TextXmlDocument.cpp 
> tinystr.cpp tinyxml.cpp tinyxmlerror.cpp tinyxmlparser.cpp 
> WbXmlDocument.cpp XmlAttribute.cpp XmlDocument.cpp XmlElement.cpp 
> XmlHandle.cpp XmlNode.cpp XmlText.cpp, $ext_shared)
> fi
> 
> VERY grateful for any tips on how to proceed.
> 
> Best regards
> David Olsson