Fix discrepency when in CyberLink precompile test

configure.ac

@@ -3940,44 +3940,42 @@ dnl  CyberLink for C++ UPnP stack
 dnl
 AC_ARG_ENABLE(cyberlink,
   [  --enable-cyberlink      CyberLink for C++ UPnP stack (default disabled)])
-if test "${CXX}" != "" -a "${enable_cyberlink}" = "yes" || (test "${enable_cyberlink}" != "no"); then
+AS_IF([test "${CXX}" != "" -a "${enable_cyberlink}" = "yes" || (test "${enable_cyberlink}" != "no")], [
   AC_ARG_WITH(cyberlink-tree,
     [    --with-cyberlink-tree=PATH CyberLink for C++ tree for static linking])
 
   dnl
   dnl test for --with-cyberlink-tree
   dnl
-  if test ! -z "${with_cyberlink_tree}" -a "${CXX}" != ""; then
+  AS_IF([test ! -z "${with_cyberlink_tree}" -a "${CXX}" != ""], [
     AC_LANG_PUSH(C++)
     real_cyberlink_tree="`cd ${with_cyberlink_tree} 2>/dev/null && pwd`"
-    if test -z "${real_cyberlink_tree}"
-    then
+    AS_IF([test -z "${real_cyberlink_tree}"], [
       dnl  The given directory can't be found
       AC_MSG_RESULT(no)
       AC_MSG_ERROR([cannot cd to ${with_cyberlink_tree}])
-    fi
-    CXXFLAGS_save="${CXXFLAGS}"
-    CXXFLAGS_cyberlink="-I${real_cyberlink_tree}/include"
-    CXXFLAGS="${CXXFLAGS} ${CXXFLAGS_cyberlink}"
+    ])
+    CPPFLAGS_save="${CPPFLAGS}"
+    CPPFLAGS_cyberlink="-I${real_cyberlink_tree}/include"
+    CPPFLAGS="${CPPFLAGS} ${CPPFLAGS_cyberlink}"
     AC_CHECK_HEADERS([cybergarage/upnp/MediaServer.h],
-      [ VLC_ADD_CXXFLAGS([upnp], [${CXXFLAGS_cyberlink}])
+      [ VLC_ADD_CPPFLAGS([upnp], [${CPPFLAGS_cyberlink}])
         VLC_ADD_PLUGINS([upnp]) 
       ],[
         AC_MSG_ERROR([cannot find CyberLink for C++ headers])
       ])
     AC_MSG_CHECKING(for libclink.a in ${with_cyberlink_tree})
-    if test -f "${real_cyberlink_tree}/lib/unix/libclink.a"
-    then
+    AS_IF([test -f "${real_cyberlink_tree}/lib/unix/libclink.a"], [
       AC_MSG_RESULT(${real_cyberlink_tree}/lib/unix/libclink.a)
       VLC_ADD_LDFLAGS([upnp], [${real_cyberlink_tree}/lib/unix/libclink.a -lexpat])
-    else
+    ], [
       AC_MSG_RESULT(no)
       AC_MSG_ERROR([cannot find ${real_cyberlink_tree}/lib/unix/libclink.a, make sure you compiled CyberLink for C++ in ${with_cyberlink_tree}])
-    fi
-    CXXFLAGS="${CXXFLAGS_save}"
+    ])
+    CPPFLAGS="${CPPFLAGS_save}"
     AC_LANG_POP([C++])
-  fi
-fi
+  ])
+])
 
 dnl
 dnl  Interface plugins