RE: PHP dumps core loading extension - problem solved.

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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