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diff --git a/3rdparty/libbacktrace/testlib.h b/3rdparty/libbacktrace/testlib.h
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+/* testlib.h -- Header for test functions for libbacktrace library
+   Copyright (C) 2012-2018 Free Software Foundation, Inc.
+   Written by Ian Lance Taylor, Google.
+
+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) The name of the author may not be used to
+    endorse or promote products derived from this software without
+    specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 LIBBACKTRACE_TESTLIB_H
+#define LIBBACKTRACE_TESTLIB_H
+
+/* Portable attribute syntax.  Actually some of these tests probably
+   won't work if the attributes are not recognized.  */
+
+#ifndef GCC_VERSION
+# define GCC_VERSION (__GNUC__ * 1000 + __GNUC_MINOR__)
+#endif
+
+#if (GCC_VERSION < 2007)
+# define __attribute__(x)
+#endif
+
+#ifndef ATTRIBUTE_UNUSED
+# define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
+#endif
+
+/* Used to collect backtrace info.  */
+
+struct info
+{
+  char *filename;
+  int lineno;
+  char *function;
+};
+
+/* Passed to backtrace callback function.  */
+
+struct bdata
+{
+  struct info *all;
+  size_t index;
+  size_t max;
+  int failed;
+};
+
+/* Passed to backtrace_simple callback function.  */
+
+struct sdata
+{
+  uintptr_t *addrs;
+  size_t index;
+  size_t max;
+  int failed;
+};
+
+/* Passed to backtrace_syminfo callback function.  */
+
+struct symdata
+{
+  const char *name;
+  uintptr_t val, size;
+  int failed;
+};
+
+/* The backtrace state.  */
+
+extern void *state;
+
+/* The number of failures.  */
+
+extern int failures;
+
+extern const char *base (const char *p);
+extern void check (const char *name, int index, const struct info *all,
+		   int want_lineno, const char *want_function,
+		   const char *want_file, int *failed);
+extern int callback_one (void *, uintptr_t, const char *, int, const char *);
+extern void error_callback_one (void *, const char *, int);
+extern int callback_two (void *, uintptr_t);
+extern void error_callback_two (void *, const char *, int);
+extern void callback_three (void *, uintptr_t, const char *, uintptr_t,
+			    uintptr_t);
+extern void error_callback_three (void *, const char *, int);
+extern void error_callback_create (void *, const char *, int);
+
+#endif /* !defined(LIBBACKTRACE_TESTLIB_H) */