Use pkg-config to detect iodbc

Author: olemarkus

ext/odbc/config.m4

@@ -370,18 +370,33 @@ PHP_ARG_WITH(iodbc,,
 
   if test "$PHP_IODBC" != "no"; then
     AC_MSG_CHECKING(for iODBC support)
-    if test "$PHP_IODBC" = "yes"; then
-      PHP_IODBC=/usr/local
+    if test -z "$PKG_CONFIG"; then
+      AC_PATH_PROG(PKG_CONFIG, pkg-config, no)
+    fi 
+    if test -x "$PKG_CONFIG" && $PKG_CONFIG --exists libiodbc ; then
+      PHP_ADD_LIBRARY_WITH_PATH(iodbc, $PHP_IODBC/$PHP_LIBDIR)
+      ODBC_TYPE=iodbc
+      ODBC_INCLUDE=`$PKG_CONFIG --cflags-only-I libiodbc`
+      ODBC_LFLAGS=`$PKG_CONFIG --libs-only-L libiodbc`
+      ODBC_LIBS=`$PKG_CONFIG --libs-only-l libiodbc`
+      PHP_EVAL_INCLINE($ODBC_INCLUDE)
+      AC_DEFINE(HAVE_IODBC,1,[ ])
+      AC_DEFINE(HAVE_ODBC2,1,[ ])
+      AC_MSG_RESULT([$ext_output])
+    else
+      if test "$PHP_IODBC" = "yes"; then
+        PHP_IODBC=/usr/local
+      fi
+      PHP_ADD_LIBRARY_WITH_PATH(iodbc, $PHP_IODBC/$PHP_LIBDIR)
+      PHP_ADD_INCLUDE($PHP_IODBC/include, 1)
+      ODBC_TYPE=iodbc
+      ODBC_INCLUDE=-I$PHP_IODBC/include
+      ODBC_LFLAGS=-L$PHP_IODBC/$PHP_LIBDIR
+      ODBC_LIBS=-liodbc
+      AC_DEFINE(HAVE_IODBC,1,[ ])
+      AC_DEFINE(HAVE_ODBC2,1,[ ])
+      AC_MSG_RESULT([$ext_output])
     fi
-    PHP_ADD_LIBRARY_WITH_PATH(iodbc, $PHP_IODBC/$PHP_LIBDIR)
-    PHP_ADD_INCLUDE($PHP_IODBC/include, 1)
-    ODBC_TYPE=iodbc
-    ODBC_INCLUDE=-I$PHP_IODBC/include
-    ODBC_LFLAGS=-L$PHP_IODBC/$PHP_LIBDIR
-    ODBC_LIBS=-liodbc
-    AC_DEFINE(HAVE_IODBC,1,[ ])
-    AC_DEFINE(HAVE_ODBC2,1,[ ])
-    AC_MSG_RESULT([$ext_output])
   fi
 fi