Allow MySQL to be compiled against extern mysqlclient library

ext/mysql/Makefile.in

@@ -6,10 +6,10 @@ VPATH     = @srcdir@
 
 LTLIBRARY_NAME    = libmysql.la
 LTLIBRARY_SOURCES = php_mysql.c
-LTLIBRARY_LIBADD  = libmysql/libmysql_client.la
+LTLIBRARY_LIBADD  = $(MYSQL_LIBADD)
 LTLIBRARY_SHARED_NAME    = mysql.la
 LTLIBRARY_SHARED_LIBADD  = $(MYSQL_LFLAGS) -lmysqlclient
 
-SUBDIRS = libmysql
+SUBDIRS = $(MYSQL_SUBDIRS)
 
 include $(topsrcdir)/build/ltlib.mk

ext/mysql/config.m4

@@ -3,8 +3,6 @@ dnl $Id$
 sinclude(ext/mysql/libmysql/acinclude.m4)
 sinclude(ext/mysql/libmysql/mysql.m4)
 
-AC_ARG_WITH(mysql,[],[enable_mysql=$withval])
-
 AC_DEFUN(PHP_MYSQL_SOCK,[
   AC_MSG_CHECKING(for MySQL UNIX socket)
   MYSQL_SOCK=/tmp/mysql.sock
@@ -22,18 +20,46 @@ AC_DEFUN(PHP_MYSQL_SOCK,[
 ])
 	
 AC_MSG_CHECKING(for MySQL support)
-AC_ARG_ENABLE(mysql,
-[  --disable-mysql          Disable embedded MySQL support],[
-  PHP_MYSQL=$enableval
+AC_ARG_WITH(mysql,
+[  --with-mysql[=DIR]      Include MySQL support. DIR is the MySQL base
+                          directory. If unspecified, the bundled MySQL library
+                          will be used.],[
+  PHP_MYSQL=$withval
 ],[
   PHP_MYSQL=yes
 ])
 AC_MSG_RESULT($PHP_MYSQL)
 
+if test "$PHP_MYSQL" = "yes"; then
+  PHP_MYSQL_SOCK
+  MYSQL_CHECKS
+  MYSQL_LIBADD=libmysql/libmysql_client.la
+  MYSQL_SUBDIRS=libmysql
+  PHP_SUBST(MYSQL_LIBADD)
+  PHP_SUBST(MYSQL_SUBDIRS)
+
+  AC_ADD_INCLUDE(${ext_src_base}libmysql)
+elif test "$PHP_MYSQL" != "no"; then
+  for i in $PHP_MYSQL; do
+    if test -r $i/include/mysql/mysql.h; then
+      MYSQL_DIR=$i
+      MYSQL_INC_DIR=$i/include/mysql
+    elif test -r $i/include/mysql.h; then
+      MYSQL_DIR=$i
+      MYSQL_INC_DIR=$i/include
+    fi
+  done
+
+  if test -z "$MYSQL_DIR"; then
+    AC_MSG_ERROR(Cannot find header files under $PHP_MYSQL)
+  fi
+
+  AC_ADD_LIBPATH($MYSQL_DIR/lib/mysql) 
+  AC_ADD_LIBRARY(mysqlclient)
+  AC_ADD_INCLUDE($MYSQL_INC_DIR)
+fi
+
 if test "$PHP_MYSQL" != "no"; then
   PHP_EXTENSION(mysql)
   AC_DEFINE(HAVE_MYSQL, 1, [Whether you have MySQL])
-  AC_ADD_INCLUDE(${ext_src_base}libmysql)
-  MYSQL_CHECKS
-  PHP_MYSQL_SOCK
 fi