Description: Update configure.ac to use AC_LANG_SOURCE macro in the input
 parameter of If-Else macros to suppress warnings in autoconf 2.68 and later.
Author: Christopher Hoskin <christopher.hoskin@gmail.com>
Forwarded: https://rt.cpan.org/Public/Bug/Display.html?id=102270
Last-Update: 2015-02-21

--- a/configure.ac
+++ b/configure.ac
@@ -9,6 +9,7 @@
 AH_TEMPLATE([LOCAL_SIZEOF_$2],[Define size of $1])
 AC_MSG_CHECKING([for LOCAL_SIZEOF_$2])
 AC_RUN_IFELSE([
+AC_LANG_SOURCE([[
 #include "confdefs.h"  
 #include "defaults.h"
 int   
@@ -23,7 +24,9 @@
     return 0;
   } else
     return 1;
-}],
+}
+]])
+],
 ac_familysize=`cat conftest.data`
 AC_MSG_RESULT([is $ac_familysize])
 AC_DEFINE_UNQUOTED([LOCAL_SIZEOF_$2],[$ac_familysize],[define family size]),
@@ -51,13 +54,16 @@
 AH_TEMPLATE([HAVE_$2_IN_STDLIB],[Define size of $1])
 AC_MSG_CHECKING([for $2 in stdlib.h])
 AC_COMPILE_IFELSE([
+AC_LANG_SOURCE([[
 #include <stdlib.h>
 int   
 main()
 {
     void * mem = malloc(8192);
     return 1;
-}],
+}
+]])
+],
 AC_MSG_RESULT([yes])
 AC_DEFINE_UNQUOTED([HAVE_$2_IN_STDLIB],[1],[$2 in <stdlib.h>]),
 AC_MSG_RESULT([not defined])
@@ -326,6 +332,7 @@
 AH_TEMPLATE([LOCAL_SIZEOF_POINTER],[Define size of pointer])
 AC_MSG_CHECKING([for size of pointer])
 AC_RUN_IFELSE([
+AC_LANG_SOURCE([[
 #include "confdefs.h"  
 #include "defaults.h"
 int   
@@ -339,7 +346,9 @@
     return 0;
   } else
     return 1;
-}],
+}
+]])
+],
 # action if true
 ac_pointersize=`cat conftest.data`
 AC_MSG_RESULT([is $ac_pointersize])
@@ -352,6 +361,7 @@
 
 AC_MSG_CHECKING([for PAGE_SIZE])
 AC_RUN_IFELSE([
+AC_LANG_SOURCE([[
 /* INPUT */
 #include "confdefs.h"
 #include "defaults.h"
@@ -363,7 +373,9 @@
 #else
   return 1;
 #endif   
-}],[
+}
+]])
+],[
 # ACTION IF TRUE
 # page size is defined
     AC_MSG_RESULT([defined])],[
@@ -371,6 +383,7 @@
 # page size is not define, run test
     AC_MSG_NOTICE([not defined, trying equivalent...])
     AC_RUN_IFELSE([
+AC_LANG_SOURCE([[
 /*  INPUT 2 */
 #   include "confdefs.h"
 #   include "defaults.h"
@@ -405,6 +418,7 @@
 	}
       return 1;
     }
+]])
     ],[
  #  ACTION IF TRUE 2
 # managed to find page size, define it in our config file
@@ -458,6 +472,7 @@
 AC_CHECK_TYPES([struct lifreq],[
 	AC_MSG_CHECKING([for sizeof lifreq - nifreq])
 	AC_RUN_IFELSE([
+AC_LANG_SOURCE([[
 #include "confdefs.h"  
 #include "defaults.h"
 int   
@@ -472,7 +487,9 @@
     return 0;
   } else
     return 1;
-}	],
+}
+]])
+	],
 # action if true
 ac_lifreqpad=`cat conftest.data`
 	AC_MSG_RESULT([is $ac_lifreqpad])
@@ -481,6 +498,7 @@
 	])
 	AC_MSG_CHECKING([for lifreq union offset])
 	AC_RUN_IFELSE([
+AC_LANG_SOURCE([[
 #include "confdefs.h"  
 #include "defaults.h"
 int   
@@ -495,7 +513,9 @@
     return 0;
   } else
     return 1;
-}	],
+}
+]])
+	],
 # action if true
 ac_lifreqoffset=`cat conftest.data`
 	AC_MSG_RESULT([is $ac_lifreqoffset])