[php-src] Issue #12965: Build Failure With libxml2-2.12.3

Issue: https://github.com/php/php-src/issues/12965 Author: debohman ### Description ``` /bin/sh /tera/tera/debo/Projects/php/php-8.2.13/libtool --silent --preserve-dup-deps --tag CC --mode=compile cc -Iext/libxml/ -I/tera/tera/debo/Projects/php/php-8.2.13/ext/libxml/ -I/tera/tera/debo/Projects/php/php-8.2.13/include -I/tera/tera/debo/Projects/php/php-8.2.13/main -I/tera/tera/debo/Projects/php/php-8.2.13 -I/tera/tera/debo/Projects/php/php-8.2.13/ext/date/lib -I/usr/local/include/libxml2 -I/usr/local/include -I/usr/local/include/libpng16 -I/usr/local/include/webp -I/usr/local/include/freetype2 -I/usr/local/include/harfbuzz -I/usr/local/include/glib-2.0 -I/usr/local/lib/glib-2.0/include -I/tera/tera/debo/Projects/php/php-8.2.13/ext/mbstring/libmbfl -I/tera/tera/debo/Projects/php/php-8.2.13/ext/mbstring/libmbfl/mbfl -I/tera/tera/debo/Projects/php/php-8.2.13/TSRM -I/tera/tera/debo/Projects/php/php-8.2.13/Zend -D_GNU_SOURCE -fno-common -Wstrict-prototypes -Wall -Wextra -Wno-strict-aliasing -Wno-unused-parameter -Wno-sign-compare -g -O2 -fvisibility=hidden -DZEND_SIGNALS -DZEND_ENABLE_STATIC_TSRMLS_CACHE=1 -c /tera/tera/debo/Projects/php/php-8.2.13/ext/libxml/libxml.c -o ext/libxml/libxml.lo -MMD -MF ext/libxml/libxml.dep -MT ext/libxml/libxml.lo /tera/tera/debo/Projects/php/php-8.2.13/ext/libxml/libxml.c:929:41: warning: comparison of distinct pointer types ('xmlStructuredErrorFunc' (aka 'void (*)(void *, const struct _xmlError *)') and 'void (*)(void *, xmlErrorPtr)' (aka 'void (*)(void *, struct _xmlError *)')) [-Wcompare-distinct-pointer-types] 929 | if (current_handler && current_handler == php_libxml_structured_error_handler) { | ~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /tera/tera/debo/Projects/php/php-8.2.13/ext/libxml/libxml.c:947:35: error: incompatible function pointer types passing 'void (void *, xmlErrorPtr)' (aka 'void (void *, struct _xmlError *)') to parameter of type 'xmlStructuredErrorFunc' (aka 'void (*)(void *, const struct _xmlError *)') [-Wincompatible-function-pointer-types] 947 | xmlSetStructuredErrorFunc(NULL, php_libxml_structured_error_handler); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /usr/local/include/libxml2/libxml/xmlerror.h:898:29: note: passing argument to parameter 'handler' here 898 | xmlStructuredErrorFunc handler); | ^ /tera/tera/debo/Projects/php/php-8.2.13/ext/libxml/libxml.c:964:8: warning: assigning to 'xmlErrorPtr' (aka 'struct _xmlError *') from 'const xmlError *' (aka 'const struct _xmlError *') discards qualifiers [-Wincompatible-pointer-types-discards-qualifiers] 964 | error = xmlGetLastError(); | ^ ~~~~~~~~~~~~~~~~~ 2 warnings and 1 error generated. make: *** [Makefile:736: ext/libxml/libxml.lo] Error 1 ``` I also ran into this trying to build PHP 8.1.26. The compiler toolchain is Clang-17, on macOS. ### PHP Version PHP 8.2.13 ### Operating System macOS