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Date: Tue, 29 Jul 2003 09:59:21 -0700
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Message-ID: <Sea2-F6uKoh6vJMkqps0000dbb3@hotmail.com>
Subject: RE: PHP dumps core loading extension - problem solved.
From: bruce1828@hotmail.com ("Bruce Bailey")

Well I believe that I have the solution to the core dumping during the C 
library wrap-up.  If I link the top-level executable, in this case either 
/usr/bin/php or httpd with the C++ compiler as the front end to the linker, 
the segfault problem goes away.

I guess this should have been obvious . . .

Bruce

>-----Original Message-----
>From: Bruce Bailey [mailto:bruce1828@hotmail.com]
>Sent: Tuesday, July 29, 2003 9:52 AM
>To: Bruce Bailey
>Subject: PHP dumps core loading extension - more information
>
>
>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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