configure.ac: Use AC_LANG_SOURCE for if else macros

Ref. http://www.flameeyes.eu/autotools-mythbuster/forwardporting/autoconf.html
"Noteworthy changes in autoconf version 2.66 through 2.68"

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

diff --git a/configure.ac b/configure.ac
index d83e0270fd3b4fd49a26fb3ae741f3ddea62ddd6..46770c5d3adfa23b99955dccd29a0c9e4fbc8ad8 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -78,7 +78,7 @@ AS_IF([test "$host_cpu" = "armv7l"],[
 # ARM-specific checks
 AS_IF([test "x$ARCHTYPE" = "xarm"],[
        AC_MSG_CHECKING([for dmb instruction])
-       AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[asm volatile("dmb":::"memory");]])],[
+       AC_COMPILE_IFELSE([AC_LANG_SOURCE([[]], [[asm volatile("dmb":::"memory");]])],[
                AC_MSG_RESULT([yes])
                AC_DEFINE([CONFIG_RCU_ARM_HAVE_DMB], [1])
        ],[
@@ -102,7 +102,7 @@ AS_IF([test "x$ARCHTYPE" = "xx86"],[
 
 # Check if sys_futex() is available
 AC_MSG_CHECKING([for sys_futex()])
-AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
                #include <sys/syscall.h>
        ]],[[
                #ifndef __NR_futex
@@ -173,7 +173,7 @@ AC_CHECK_FUNCS([sched_setaffinity],[
                # We do have it.  Confirm that we have CPU_ZERO, and it actually works.
                AC_MSG_CHECKING([whether CPU_ZERO works])
                AH_TEMPLATE([HAVE_CPU_ZERO], [Defined to 1 if we have CPU_ZERO and it works])
-               AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+               AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
                                #define _GNU_SOURCE
                                #include <sched.h>
                        ]],[[
@@ -190,7 +190,7 @@ AC_CHECK_FUNCS([sched_setaffinity],[
                # Check how many arguments does sched_setaffinity take.
                # Should be 3 or 2.
                AC_MSG_CHECKING([how many arguments sched_setaffinity takes])
-               AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+               AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
                                #include <sched.h>
                        ]],[[
                                cpu_set_t foo;