added experimental assert with stacktrace for elf targets using gcc

Jamfile

@@ -23,7 +23,8 @@ rule linking ( properties * )
 	local result ;
 
 	# openssl libraries, if enabled
-	if <openssl>sha-1 in $(properties) || <openssl>pe in $(properties)
+	if <openssl>sha-1 in $(properties)
+		|| <openssl>pe in $(properties)
 	{
 		if <target-os>windows in $(properties)
 		{
@@ -42,7 +43,8 @@ rule linking ( properties * )
 	}
 
 	# socket functions on windows require winsock libraries
-	if <target-os>windows in $(properties) || <target-os>cygwin in $(properties)
+	if <target-os>windows in $(properties)
+		|| <target-os>cygwin in $(properties)
 	{
 		result += <library>ws2_32
 			<library>wsock32
@@ -68,6 +70,15 @@ rule linking ( properties * )
 		;
 	}
 
+	if <toolset>gcc in $(properties)
+		&& <target-os>linux in $(properties)
+		&& <variant>debug in $(properties)
+	{
+		# for backtraces in assertion failures
+		# which only works on ELF targets with gcc
+		result += <cxxflags>-rdynamic <source>src/assert.cpp ;
+	}
+
 	if <boost>source in $(properties)
 	{
 		result += <library>/boost/thread//boost_thread

include/libtorrent/assert.hpp

@@ -0,0 +1,55 @@
+/*
+
+Copyright (c) 2007, Arvid Norberg
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * 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.
+    * Neither the name of the author 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 COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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 TORRENT_ASSERT_HPP_INCLUDED
+#define TORRENT_ASSERT_HPP_INCLUDED
+
+#ifndef NDEBUG
+#if defined __linux__ && defined _GNUC
+#ifdef assert
+#undef assert
+#endif
+
+void assert_fail(int line, char const* file);
+
+#define assert(x) if (!(x)) assert_fail(__LINE__, __FILE__)
+
+#endif
+
+#else
+#ifndef assert
+#define assert(x) (void)
+#endif
+#endif
+
+#endif
+

include/libtorrent/debug.hpp

@@ -80,3 +80,4 @@ namespace libtorrent
 }
 
 #endif // TORRENT_DEBUG_HPP_INCLUDED
+

src/assert.cpp

@@ -0,0 +1,60 @@
+/*
+
+Copyright (c) 2007, Arvid Norberg
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * 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.
+    * Neither the name of the author 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 COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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 NDEBUG
+
+#include <execinfo.h>
+
+void assert_fail(int line, char const* file)
+{
+
+	fprintf(stderr, "assertion failed. Please file a bugreport at "
+		"http://code.rasterbar.com/libtorrent/newticket\n"
+		"Please include the following information:\n\n"
+		"file: '%s'\n"
+		"line: %d\n"
+		"stack:\n", file, line);
+
+	void* stacktrace[50];
+	int size = backtrace(stack, 50);
+	char** symbols = backtrace_symbols(stack, size);
+
+	for (int i = 0; i < size; ++i)
+	{
+		fprintf(stderr, "%d: %s\n", i, symbols[i]);
+	}
+
+	free(symbols);
+}
+
+#endif
+