disable virtual table pointer checks for C++

Author: devnexen

build/php.m4

@@ -745,6 +745,7 @@ AC_DEFUN([PHP_REQUIRE_CXX],[
     case "$CXX" in
       *clang++*)
     	PHP_ADD_LIBRARY(c++)
+    	PHP_ADD_LIBRARY(c++abi)
 	;;
       *)
     	PHP_ADD_LIBRARY(stdc++)

configure.ac

@@ -1647,7 +1647,7 @@ int main(void) {
     CFLAGS="$OLD_CFLAGS"
     if test "$php_cv_ubsan_no_function" = yes; then
       CFLAGS="$CFLAGS -fno-sanitize=function"
-      CXXFLAGS="$CFLAGS -fno-sanitize=function"
+      CXXFLAGS="$CFLAGS -fno-sanitize=function,vptr"
     fi
   ], [AC_MSG_ERROR([UndefinedBehaviorSanitizer is not available])])
 fi

ext/intl/config.m4

@@ -85,6 +85,9 @@ if test "$PHP_INTL" != "no"; then
   AS_IF([$PKG_CONFIG icu-uc --atleast-version=74],[
     AC_MSG_RESULT([yes])
     PHP_CXX_COMPILE_STDCXX(17, mandatory, PHP_INTL_STDCXX)
+    case $CXX in
+    *clang++*) ICU_CXXFLAGS="$ICU_CXXFLAGS -stdlib=libc++" PHP_ADD_LIBRARY(c++) PHP_ADD_LIBRARY(c++abi)
+    esac
   ],[
     AC_MSG_RESULT([no])
     PHP_CXX_COMPILE_STDCXX(11, mandatory, PHP_INTL_STDCXX)
@@ -94,6 +97,7 @@ if test "$PHP_INTL" != "no"; then
   case $host_alias in
   *cygwin*) PHP_INTL_CXX_FLAGS="$PHP_INTL_CXX_FLAGS -D_POSIX_C_SOURCE=200809L"
   esac
+
   if test "$ext_shared" = "no"; then
     PHP_ADD_SOURCES(PHP_EXT_DIR(intl), $PHP_INTL_CXX_SOURCES, $PHP_INTL_CXX_FLAGS)
   else