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e074e029ee
The name "rem_size" is used by a macro in a system header on AIX,
specifically `sys/xmem.h`. Without changing the name, you get the
name mangled like so:
```
In file included from /usr/include/sys/uio.h:92:0,
from /QOpenSys/pkgs/lib/gcc/powerpc-ibm-aix6.1.0.0/6.3.0/include-fixed-7.1/sys/socket.h:83,
from /usr/include/sys/syslog.h:151,
from /usr/include/syslog.h:29,
from /home/calvin/rpmbuild/BUILD/php-8.0.0RC5/main/php_syslog.h:27,
from /home/calvin/rpmbuild/BUILD/php-8.0.0RC5/main/php.h:318,
from /home/calvin/rpmbuild/BUILD/php-8.0.0RC5/ext/sockets/sendrecvmsg.c:17:
/home/calvin/rpmbuild/BUILD/php-8.0.0RC5/ext/sockets/sendrecvmsg.c: In function 'zif_socket_cmsg_space':
/home/calvin/rpmbuild/BUILD/php-8.0.0RC5/ext/sockets/sendrecvmsg.c:298:10: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
size_t rem_size = ZEND_LONG_MAX - entry->size;
^
/home/calvin/rpmbuild/BUILD/php-8.0.0RC5/ext/sockets/sendrecvmsg.c:298:10: error: expected expression before '.' token
/home/calvin/rpmbuild/BUILD/php-8.0.0RC5/ext/sockets/sendrecvmsg.c:299:18: error: 'u2' undeclared (first use in this function)
size_t n_max = rem_size / entry->var_el_size;
^
/home/calvin/rpmbuild/BUILD/php-8.0.0RC5/ext/sockets/sendrecvmsg.c:299:18: note: each undeclared identifier is reported only once for each function it appears in
```
...because of the declaration in `sys/xmem.h`:
```
```
This just renames the variable so that it won't trip on this
definition. Tested to fix the build on IBM i PASE.
Closes GH-6453.