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Date: Wed, 07 Feb 2007 18:53:38 +0000
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To: Antony Dovgal <antony@zend.com>
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Subject: Re: [PHP-DEV]  C++ in non-threaded PHP
From: cem@php.net (Caroline Maynard)

Antony Dovgal wrote:
> On 01/23/2007 06:07 PM, Caroline Maynard wrote:
>> I hit some problems compiling a C++ extension in a non-threaded 
>> environment, because of some missing extern "C" declarations. Looks 
>> like this was previously fixed for threaded mode only. Please would 
>> someone with karma apply the following patch?
> 
> What about ini_scanner_globals & language_scanner_globals?
> Don't they require the same declaration?

I think it's almost certain that they do - I just didn't have a test for 
them, so I used the "if it ain't broke don't fix it" principle.

> 
> Also, how to reproduce it?
> I compile C++ extensions quite often and do not see any problems.

Well you need to have an extension which references CG() or EG() from 
C++ and build it with --disable-zts. So, compiling the sdo extension, 
which refers to, for example, EG(uninitialized_zval_ptr), the link step 
gives:

SDO_DataObject.obj : error LNK2001: unresolved external symbol 
"__declspec(dllimport) struct _zend_executor_globals executor_globals" 
(__imp_?executor_globals@@3U_zend_executor_globals@@A)

Debug\php_sdo.dll : fatal error LNK1120: 1 unresolved externals

because the references are getting mangled. Putting them inside extern 
"C" fixes this.

(my example was obviously on Windows, but the same should apply on *IX)