Warnings during EXPAT compilation in 4.3.3RC2

Tested today 4.3.3RC2 and got a lot of warning during compilation on Solaris 2.9, gcc 2.95: /bin/sh /pangaea/install/php-4.3.3RC2/libtool --silent --preserve-dup-deps --mode=compile /pangaea/install/php-4.3.3RC2/meta_ccld -DBYTEORDER=4321 -Iext/xml/ -I/pangaea/install/php-4.3.3RC2/ext/xml/ -DPHP_ATOM_INC -I/pangaea/install/php-4.3.3RC2/include -I/pangaea/install/php-4.3.3RC2/main -I/pangaea/install/php-4.3.3RC2 -I/pangaea/webserver/plugins/include -I/pangaea/install/php-4.3.3RC2/Zend -I/edvs1/edvsoft/SYBASE.1003/sybase/include -I/pangaea/install/php-4.3.3RC2/ext/xml/expat -D_POSIX_PTHREAD_SEMANTICS -D_POSIX_PTHREAD_SEMANTICS -D_REENTRANT -I/pangaea/install/php-4.3.3RC2/TSRM -g -O2 -pthreads -DZTS -prefer-pic -c /pangaea/install/php-4.3.3RC2/ext/xml/expat/xmlrole.c -o ext/xml/expat/xmlrole.lo In file included from /pangaea/install/php-4.3.3RC2/ext/xml/expat/xmlrole.h:14,

                 from /pangaea/install/php-4.3.3RC2/ext/xml/expat/xmlrole.c:16:
/pangaea/install/php-4.3.3RC2/ext/xml/expat/xmltok.h:143: warning: `regparm' attribute directive ignored
/pangaea/install/php-4.3.3RC2/ext/xml/expat/xmltok.h:144: warning: `regparm' attribute directive ignored
/pangaea/install/php-4.3.3RC2/ext/xml/expat/xmltok.h:149: warning: `regparm' attribute directive ignored
/pangaea/install/php-4.3.3RC2/ext/xml/expat/xmltok.h:280: warning: `regparm' attribute directive ignored
/pangaea/install/php-4.3.3RC2/ext/xml/expat/xmltok.h:281: warning: `regparm' attribute directive ignored
/pangaea/install/php-4.3.3RC2/ext/xml/expat/xmlrole.c:114: warning: `regparm' attribute directive ignored

.... <and a lot of more lines looking like that> Configure: CC=gcc ./configure --prefix=/pangaea/PHP4 --disable-cli --with-nsapi=/pangaea/webserver --with-sybase-ct=$SYBASE --without-mysql --enable-sysvshm --enable-sysvsem --enable-ftp --enable-versioning --enable-session --enable-trans-sid --with-zlib