configure-time support for the restrict keyword.

mpeg2dec/acinclude.m4

+dnl AC_C_RESTRICT
+dnl Do nothing if the compiler accepts the restrict keyword.
+dnl Otherwise define restrict to __restrict__ or __restrict if one of
+dnl those work, otherwise define restrict to be empty.
+AC_DEFUN([AC_C_RESTRICT],
+    [ac_cv_c_inline=no
+    for ac_kw in restrict __restrict__ __restrict; do
+	AC_TRY_COMPILE([],[char * $ac_kw p;],[ac_cv_c_restrict=$ac_kw; break])
+    done
+    case $ac_cv_c_restrict in
+	restrict) ;;
+	no)	AC_DEFINE([restrict],,
+		    [Define as `__restrict' if that's what the C compiler calls
+		    it, or to nothing if it is not supported.]) ;;
+	*)	AC_DEFINE_UNQUOTED([restrict],$ac_cv_c_restrict) ;;
+    esac])
+
 dnl AC_C_ATTRIBUTE_ALIGNED
 dnl define ATTRIBUTE_ALIGNED_MAX to the maximum alignment if this is supported
 AC_DEFUN([AC_C_ATTRIBUTE_ALIGNED],

mpeg2dec/configure.in

@@ -95,6 +95,7 @@ AC_CHECK_GENERATE_INTTYPES([include])
 dnl Checks for typedefs, structures, and compiler characteristics.
 AC_C_CONST
 AC_C_INLINE
+AC_C_RESTRICT
 AC_TYPE_SIZE_T
 AC_C_BIGENDIAN
 

mpeg2dec/vc++/config.h

@@ -101,5 +101,9 @@
    if it is not supported. */
 #define inline __inline
 
+/* Define as `__restrict' if that's what the C compiler calls it, or to
+   nothing if it is not supported. */
+#define restrict __restrict
+
 /* Define to `unsigned' if <sys/types.h> does not define. */
 /* #undef size_t */