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+/* -*- Mode: c; tab-width: 8; indent-tabs-mode: 1; c-basic-offset: 8; -*- */
+/*
+ * Copyright (c) 1993, 1994, 1995, 1996, 1997
+ *	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 Computer Systems
+ *	Engineering Group at Lawrence Berkeley Laboratory.
+ * 4. Neither the name of the University nor of the Laboratory 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.
+ */
+
+#ifndef lib_funcattrs_h
+#define lib_funcattrs_h
+
+#include "compiler-tests.h"
+
+/*
+ * Attributes to apply to functions and their arguments, using various
+ * compiler-specific extensions.
+ */
+
+/*
+ * NORETURN, before a function declaration, means "this function
+ * never returns".  (It must go before the function declaration, e.g.
+ * "extern NORETURN func(...)" rather than after the function
+ * declaration, as the MSVC version has to go before the declaration.)
+ */
+#if __has_attribute(noreturn) \
+    || ND_IS_AT_LEAST_GNUC_VERSION(2,5) \
+    || ND_IS_AT_LEAST_SUNC_VERSION(5,9) \
+    || ND_IS_AT_LEAST_XL_C_VERSION(10,1) \
+    || ND_IS_AT_LEAST_HP_C_VERSION(6,10)
+  /*
+   * Compiler with support for __attribute((noreturn)), or GCC 2.5 and
+   * later, or some compiler asserting compatibility with GCC 2.5 and
+   * later, or Solaris Studio 12 (Sun C 5.9) and later, or IBM XL C 10.1
+   * and later (do any earlier versions of XL C support this?), or HP aCC
+   * A.06.10 and later.
+   */
+  #define NORETURN __attribute((noreturn))
+
+  /*
+   * However, GCC didn't support that for function *pointers* until GCC
+   * 4.1.0; see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3481.
+   *
+   * Sun C/Oracle Studio C doesn't seem to support it, either.
+   */
+  #if (defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) < 401)) \
+      || (defined(__SUNPRO_C))
+    #define NORETURN_FUNCPTR
+  #else
+    #define NORETURN_FUNCPTR __attribute((noreturn))
+  #endif
+#elif defined(_MSC_VER)
+  /*
+   * MSVC.
+   * It doesn't allow __declspec(noreturn) to be applied to function
+   * pointers.
+   */
+  #define NORETURN __declspec(noreturn)
+  #define NORETURN_FUNCPTR
+#else
+  #define NORETURN
+  #define NORETURN_FUNCPTR
+#endif
+
+/*
+ * WARN_UNUSED_RESULT, before a function declaration, means "the caller
+ * should use the result of this function" (even if it's just a success/
+ * failure indication).
+ */
+#if __has_attribute(warn_unused_result) \
+    || ND_IS_AT_LEAST_GNUC_VERSION(3,4) \
+    || ND_IS_AT_LEAST_HP_C_VERSION(6,25)
+  #define WARN_UNUSED_RESULT __attribute((warn_unused_result))
+#else
+  #define WARN_UNUSED_RESULT
+#endif
+
+/*
+ * PRINTFLIKE(x,y), after a function declaration, means "this function
+ * does printf-style formatting, with the xth argument being the format
+ * string and the yth argument being the first argument for the format
+ * string".
+ */
+#if __has_attribute(__format__) \
+    || ND_IS_AT_LEAST_GNUC_VERSION(2,3) \
+    || ND_IS_AT_LEAST_XL_C_VERSION(10,1) \
+    || ND_IS_AT_LEAST_HP_C_VERSION(6,10)
+  /*
+   * Compiler with support for it, or GCC 2.3 and later, or some compiler
+   * asserting compatibility with GCC 2.3 and later, or IBM XL C 10.1
+   * and later (do any earlier versions of XL C support this?),
+   * or HP aCC A.06.10 and later.
+   */
+  #define PRINTFLIKE(x,y) __attribute__((__format__(__printf__,x,y)))
+
+  /*
+   * However, GCC didn't support that for function *pointers* until GCC
+   * 4.1.0; see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3481.
+   * XL C 16.1 (and possibly some earlier versions, but not 12.1 or 13.1) has
+   * a similar bug, the bugfix for which was made in:
+   * * version 16.1.1.8 for Linux (25 June 2020), which fixes
+   *   https://www.ibm.com/support/pages/apar/LI81402
+   * * version 16.1.0.5 for AIX (5 May 2020), which fixes
+   *   https://www.ibm.com/support/pages/apar/IJ24678
+   *
+   * When testing versions, keep in mind that XL C 16.1 pretends to be both
+   * GCC 4.2 and Clang 4.0 at once.
+   */
+  #if (ND_IS_AT_LEAST_GNUC_VERSION(4,1) \
+       && !ND_IS_AT_LEAST_XL_C_VERSION(10,1)) \
+      || (ND_IS_AT_LEAST_XL_C_VERSION(16,1) \
+          && (ND_IS_AT_LEAST_XL_C_MODFIX(1, 8) && defined(__linux__)) \
+              || (ND_IS_AT_LEAST_XL_C_MODFIX(0, 5) && defined(_AIX)))
+    #define PRINTFLIKE_FUNCPTR(x,y) __attribute__((__format__(__printf__,x,y)))
+  #endif
+#endif
+
+#if !defined(PRINTFLIKE)
+#define PRINTFLIKE(x,y)
+#endif
+#if !defined(PRINTFLIKE_FUNCPTR)
+#define PRINTFLIKE_FUNCPTR(x,y)
+#endif
+
+/*
+ * For flagging arguments as format strings in MSVC.
+ */
+#ifdef _MSC_VER
+ #include <sal.h>
+ #define FORMAT_STRING(p) _Printf_format_string_ p
+#else
+ #define FORMAT_STRING(p) p
+#endif
+
+#endif /* lib_funcattrs_h */