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diff --git a/sys/i386/boot/dosboot/cdefs.h b/sys/i386/boot/dosboot/cdefs.h
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+++ b/sys/i386/boot/dosboot/cdefs.h
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+/*
+ * Copyright (c) 1991, 1993
+ *      The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by the University of
+ *      California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *      from: @(#)cdefs.h       8.1 (Berkeley) 6/2/93
+ *      $Id: cdefs.h,v 1.6 1993/10/16 17:16:24 rgrimes Exp $
+ */
+
+#ifndef _CDEFS_H_
+#define _CDEFS_H_
+
+#if defined(__cplusplus)
+#define __BEGIN_DECLS   extern "C" {
+#define __END_DECLS     };
+#else
+#define __BEGIN_DECLS
+#define __END_DECLS
+#endif
+
+/*
+ * The __CONCAT macro is used to concatenate parts of symbol names, e.g.
+ * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
+ * The __CONCAT macro is a bit tricky -- make sure you don't put spaces
+ * in between its arguments.  __CONCAT can also concatenate double-quoted
+ * strings produced by the __STRING macro, but this only works with ANSI C.
+ */
+#if defined(__STDC__) || defined(__cplusplus)
+#if defined(__P)
+#undef __P
+#endif  /* defined(__P) */
+#define __P(protos)     protos          /* full-blown ANSI C */
+#define __CONCAT(x,y)   x ## y
+#define __STRING(x)     #x
+
+#else   /* !(__STDC__ || __cplusplus) */
+#if defined(__P)
+#undef __P
+#endif  /* defined(__P) */
+#define __P(protos)     ()              /* traditional C preprocessor */
+#define __CONCAT(x,y)   x/**/y
+#define __STRING(x)     "x"
+
+/* delete ANSI C keywords */
+#define const                           
+#define inline
+#define signed
+#define volatile
+#endif  /* !(__STDC__ || __cplusplus) */
+
+/*
+ * GCC has extensions for declaring functions as const (`pure' - always returns
+ * the same value given the same inputs, i.e., has no external state and
+ * no side effects) and volatile (nonreturning or `dead').
+ * These mainly affect optimization and warnings.  
+ *
+ * To facilitate portability of a non-standard extension we define __pure
+ * and __dead and use these for qualifying functions. Non-gcc compilers
+ * which have similar extensions can then define these appropriately.
+ *
+ * Unfortunately, GCC complains if these are used under strict ANSI mode 
+ * (`gcc -ansi -pedantic'), hence we need to define them only if compiling 
+ * without this.
+ */
+#if defined(__GNUC__) && !defined(__STRICT_ANSI__)
+#define __dead __volatile
+#define __pure __const
+#else
+#define __dead
+#define __pure
+#endif
+
+#endif /* !_CDEFS_H_ */