Can you please compile with --enable-debug, crash the program and then give us the backtrace? :)

./configure --with-zlib --enable-debug
<snip>

[root@sparc64 php-4.3.0]# ./sapi/cgi/php
Bus error (core dumped)

[root@sparc64 php-4.3.0]# gdb -c php.core ./sapi/cgi/php
GNU gdb 4.16.1
Copyright 1996 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "sparc64-unknown-openbsd3.2"...
Core was generated by `php'.
Program terminated with signal 10, Bus error.

Dwarf Error: Cannot find referent at offset 507.
(gdb) bt
Segmentation fault (core dumped)


Sorry, that is as good as it gets from a backtrace. I have done this on two different boxes (U5 & U10) with the same results.

Looks like something is wrong with your gdb.. I had the 
same problem (gdb coredumping on me), but on Tru64.. 
It went away when I compiled gdb with Compaq's native C 
compiler.. 

vi a.c
int main()
{
        char *a, *b;
        a = 0;
        b = 0;
        strcpy(a, b);

        return 0;
}

[root@sparc64 root]# gcc -o a a.c -g

[root@sparc64 root]# ./a
Segmentation fault (core dumped)

[root@sparc64 root]# gdb -c a.core a
GNU gdb 4.16.1
Copyright 1996 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "sparc64-unknown-openbsd3.2"...
Core was generated by `a'.
Program terminated with signal 11, Segmentation fault.
#0  0x403855b0 in ?? ()
(gdb) bt
#0  0x403855b0 in ?? ()
#1  0x1004dc in ___start ()
(gdb) 

Seems to work...

I used OpenBSD's 3.2 native compiler and debugger.

[root@sparc64 root]# gcc -v
Reading specs from /usr/lib/gcc-lib/sparc64-unknown-openbsd3.2/2.95.3/specs
gcc version 2.95.3 20010125 (prerelease)

[root@sparc64 root]# gdb -v
GNU gdb 4.16.1

What's the zlib version on this box and could you cat/paste config.nice?

[root@sparc64 php-4.3.0]# cat config.nice 
#! /bin/sh
#
# Created by configure

'./configure' \
'--with-zlib' \
'--enable-debug' \
"$@"

[root@sparc64 php-4.3.0]# l /usr/lib/libz*
-r--r--r--  1 root  bin  83270 Oct  3 20:28 /usr/lib/libz.a
-r--r--r--  1 root  bin  67266 Oct  3 20:28 /usr/lib/libz.so.1.4
-r--r--r--  1 root  bin  91040 Oct  3 20:28 /usr/lib/libz_p.a
-r--r--r--  1 root  bin  82904 Oct  3 20:28 /usr/lib/libz_pic.a

I also downloaded zlib 1.1.4 and compiled it myself with the same results.

Please try using this CVS snapshot:

  http://snaps.php.net/php4-STABLE-latest.tar.gz
 
For Windows:
 
  http://snaps.php.net/win32/php4-win32-STABLE-latest.zip

No feedback was provided. The bug is being suspended because
we assume that you are no longer experiencing the problem.
If this is not the case and you are able to provide the
information that was requested earlier, please do so and
change the status of the bug back to "Open". Thank you.

latest stable doesn't build for me on obsd 3.2/sparc64:
/bin/sh /opt/php4-STABLE-200307211730/libtool --silent --preserve-dup-deps --mode=compile gcc -mv8 -mcpu=v9 -m64  -Iext/iconv/ -I/opt/php4-STABLE-200307211730/ext/iconv/ -DPHP_ATOM_INC -I/opt/php4-STABLE-200307211730/include -I/opt/php4-STABLE-200307211730/main -I/opt/php4-STABLE-200307211730 -I/opt/php4-STABLE-200307211730/Zend -I/usr/local/include -I/usr/local//include -I/opt/php4-STABLE-200307211730/ext/xml/expat  -I/opt/php4-STABLE-200307211730/TSRM  -g -O2  -prefer-pic -c /opt/php4-STABLE-200307211730/ext/iconv/iconv.c -o ext/iconv/iconv.lo
/opt/php4-STABLE-200307211730/ext/iconv/iconv.c:43: `#include' expects "FILENAME" or <FILENAME>

Config.nice has (direct from the 4.2.3 ports):
#
# Created by configure

CC='gcc -mv8 -mcpu=v9 -m64' \
'./configure' \
'--with-apxs=/usr/sbin/apxs' \
'--enable-cli' \
'--with-iconv=/usr/local/' \
'--with-gettext=/usr/local' \
'--enable-dio' \
'--without-pear' \
'--enable-bcmath' \
'--enable-session' \
'--enable-trans-sid' \
'--enable-calendar' \
'--enable-ctype' \
'--enable-ftp' \
'--with-pcre-regex' \
'--with-posix' \
'--enable-sockets' \
'--enable-sysvsem' \
'--enable-sysvshm' \
'--enable-yp' \
"$@"

(PS: Posted here rather than a new bug because the original bug bites me on 4.2.3.)

php at gotontheinter dot net:
Could you send me your config.log? <moriyoshi@php.net>