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diff --git a/tests/tap/macros.h b/tests/tap/macros.h
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+/*
+ * Helpful macros for TAP header files.
+ *
+ * This is not, strictly speaking, related to TAP, but any TAP add-on is
+ * probably going to need these macros, so define them in one place so that
+ * everyone can pull them in.
+ *
+ * This file is part of C TAP Harness.  The current version plus supporting
+ * documentation is at <http://www.eyrie.org/~eagle/software/c-tap-harness/>.
+ *
+ * Copyright 2008, 2012 Russ Allbery <rra@stanford.edu>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#pragma once
+
+/*
+ * __attribute__ is available in gcc 2.5 and later, but only with gcc 2.7
+ * could you use the __format__ form of the attributes, which is what we use
+ * (to avoid confusion with other macros), and only with gcc 2.96 can you use
+ * the attribute __malloc__.  2.96 is very old, so don't bother trying to get
+ * the other attributes to work with GCC versions between 2.7 and 2.96.
+ */
+#ifndef __attribute__
+# if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 96)
+#  define __attribute__(spec)   /* empty */
+# endif
+#endif
+
+/*
+ * We use __alloc_size__, but it was only available in fairly recent versions
+ * of GCC.  Suppress warnings about the unknown attribute if GCC is too old.
+ * We know that we're GCC at this point, so we can use the GCC variadic macro
+ * extension, which will still work with versions of GCC too old to have C99
+ * variadic macro support.
+ */
+#if !defined(__attribute__) && !defined(__alloc_size__)
+# if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 3)
+#  define __alloc_size__(spec, args...) /* empty */
+# endif
+#endif
+
+/*
+ * LLVM and Clang pretend to be GCC but don't support all of the __attribute__
+ * settings that GCC does.  For them, suppress warnings about unknown
+ * attributes on declarations.  This unfortunately will affect the entire
+ * compilation context, but there's no push and pop available.
+ */
+#if !defined(__attribute__) && (defined(__llvm__) || defined(__clang__))
+# pragma GCC diagnostic ignored "-Wattributes"
+#endif
+
+/* Used for unused parameters to silence gcc warnings. */
+/* #define UNUSED __attribute__((__unused__)) */
+
+/*
+ * BEGIN_DECLS is used at the beginning of declarations so that C++
+ * compilers don't mangle their names.  END_DECLS is used at the end.
+ */
+#undef BEGIN_DECLS
+#undef END_DECLS
+#ifdef __cplusplus
+# define BEGIN_DECLS    extern "C" {
+# define END_DECLS      }
+#else
+# define BEGIN_DECLS    /* empty */
+# define END_DECLS      /* empty */
+#endif