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Date: Fri, 25 Jul 2003 15:32:51 -0700
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Message-ID: <Sea2-F22NhXooszB1fA0000f177@hotmail.com>
Subject: PHP dumps core loading extension - more information
From: bruce1828@hotmail.com ("Bruce Bailey")

A new discovery . . .

I created a new extension with only one function and it calls a dso library 
that also has only one function.  So the libraries are:

php --> my new extension --> my new utility library.

the new utility library has only this function:

int function1(void){return 456;}

When I compile and link the library with C, I can run 'phpinfo();' with no 
problems.  When I use C++ to compile and link, running 'phpinfo();' core 
dumps.  Gdb reports the same backtrace as listed below.  This can't be 
right.  Outside of the php context, C and C++ co-exist perfectly.

Are there some php-related configuration options that might have bearing on 
this?  What am I missing?

This doesn't make any sense.

Bruce



>I should have thought of including a backtrace before:
>
>(gdb) bt
>#0  0x0000030002891c30 in ?? ()
>#1  0x000003ff800dd7d0 in exit () from /usr/shlib/libc.so
>#2  0x000003ff800dd7d0 in exit () from /usr/shlib/libc.so
>Cannot access memory at address 0x20
>(gdb)
>
>
>
> >From: "Bruce Bailey" <bruce1828@hotmail.com>
> >To: internals@lists.php.net
> >Subject: [PHP-DEV] PHP dumps core loading extension
> >Date: Fri, 25 Jul 2003 10:55:50 -0700
> >
> >I hope this is the right place for this type of question.  If not, please
> >let me know a more appropriate forum.
> >
> >I have a PHP extension (written in C) that calls a utility library that I
> >wrote in C++.  For my testing and debugging, I have been trying to 
>exercise
> >my code using PHP from the command line ('/usr/bin/php').  For some 
>reason,
> >PHP dumps core (segmentation fault) when I try to use any of my 
>functions.
> >
> >Even if my php script is simply <?php phpinfo(); ?>.  At this point, I'm
> >not even calling any of my C++ utility functions, 
>PHP_MINIT_FUNCTION(myext)
> >and PHP_RINIT_FUNCTION(myext) are essentially no-ops, and
> >PHP_MINFO_FUNCTION(myext) has only constant asciiz strings.  My phpinfo()
> >still dumps core.
> >
> >To load my utility library, I have a config.m4 line:
> >
> >PHP_EVAL_LIBLINE("-L/bjb/lib -lbjbutility")
> >
> >When I comment out the 'PHP_EVAL_LIBLINE', the phpinfo() functions works
> >OK.
> >
> >I have used the C++ utility library for several years, outside of the
> >context of PHP with no problems, even when calling from a C mainline.
> >
> >Has anyone seen this before?
> >Any suggestions as to what might be strategy for debugging this?
> >Where else can I look for information that might be useful?
> >
> >Thanks in advance,
> >
> >Bruce
> >
> >Environment information:
> >
> >Php 4.3.1
> >Configure Command => './configure' '--target=' '--prefix=/bjb'
> >'--with-apxs=/bjb/home/www_serv/bin/apxs' '--with-gd' '--with-zlib'
> >'--with-zlib-dir=/home/jeb/target/bjb' '--with-jpeg'
> >'--with-jpeg-dir=/home/jeb/target/bjb' '--with-png'
> >'--with-png-dir=/home/jeb/target/bjb' '--with-freetype'
> >'--with-freetype-dir=/home/jeb/target/bjb'
> >'--with-pdflib=/home/jeb/target/bjb' '--with-enable-dba' '--with-cdb'
> >'--with-dbm'
> >
> >DEC Tru64
> >cxx -V
> >DIGITAL C++ V6.1-027 on DIGITAL UNIX V4.0 (Rev. 1229)

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