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Date: Sun, 16 May 2004 04:08:55 +0100
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Subject: Extension written in C++ and undefined symbols
From: iridium@beyondunreal.com (Peter 'iridium' Waller)

I've currently got some libraries written in C++ with various class 
interfaces, I was going to write an interface between them and PHP but 
got very stuck trying to get the extension to recognize any C++ linked 
to it at all..

I spent quite a while searching the archives and google before posting 
this, and found some advice telling me to set EXTRA_LDFLAGS = -lstdc++. 
This seemed to fix the odd one or two things, I don't remember what now 
because that was a while ago..

in my config.m4:

PHP_NEW_EXTENSION(nalicity, nalicity.c test.cpp, $ext_shared)

in test.cpp:

void blah()
{
   printf( "\n\nBlah\n\n" );
}

in nalicity.c

PHP_FUNCTION(testfunction)
{
   blah();
}

Doesn't work unless I rename test.cpp to test.c and change the 
PHP_NEW_EXTENSION line accordingly. It compiles fine, I just get the error:

/usr/bin/php: relocation error: 
/usr/lib/php/extensions/no-debug-non-zts-20020429/../../../../src/php/exts/nalicity/modules/nalicity.so: 
undefined symbol: blah

when I try to run the PHP and load the dl(). As I said above though, 
works fine as a plain old C file. Any ideas? I've stayed up all night 
trying to figure it out but have gotten nowhere.

(and on an unrelated note, is there any way I can specify an absolute 
path to dl()? I feel kinda stupid with all those ../..'s in there.)

Thanks in advance for any help,

Peter.