Added libunwind to build process

But it's not used anywhere yet

CMakeLists.txt

@@ -41,6 +41,14 @@ else ( LIBLZO_FOUND )
   set( LIBLZO_LIBRARIES )
 endif( LIBLZO_FOUND )
 
+find_package( LibUnwind COMPONENTS LIBUNWIND_HAS_UNW_GETCONTEXT LIBUNWIND_HAS_INIT_LOCAL )
+if ( LIBUNWIND_FOUND )
+  ADD_DEFINITIONS( -DHAVE_LIBUNWIND )
+  include_directories( ${LIBUNWIND_INCLUDE_DIRS} )
+else ( LIBUNWIND_FOUND )
+  set( LIBUNWIND_LIBRARIES )
+endif( LIBUNWIND_FOUND )
+
 file( GLOB sourceFiles "*.cc" )
 add_executable( zbackup ${sourceFiles} ${protoSrcs} ${protoHdrs} )
 
@@ -51,6 +59,7 @@ target_link_libraries( zbackup
   ${ZLIB_LIBRARIES}
   ${LIBLZMA_LIBRARIES}
   ${LIBLZO_LIBRARIES}
+  ${LIBUNWIND_LIBRARIES}
 )
 
 install( TARGETS zbackup DESTINATION bin )

cmake/FindLibUnwind.cmake

@@ -0,0 +1,77 @@
+#.rst:
+# FindLibUnwind
+# -----------
+#
+# Find LibUnwind
+#
+# Find LibUnwind headers and library
+#
+# ::
+#
+#   LIBUNWIND_FOUND                     - True if libunwind is found.
+#   LIBUNWIND_INCLUDE_DIRS              - Directory where libunwind headers are located.
+#   LIBUNWIND_LIBRARIES                 - Unwind libraries to link against.
+#   LIBUNWIND_HAS_UNW_GETCONTEXT        - True if unw_getcontext() is found (required).
+#   LIBUNWIND_HAS_UNW_INIT_LOCAL        - True if unw_init_local() is found (required).
+#   LIBUNWIND_VERSION_STRING            - version number as a string (ex: "5.0.3")
+
+#=============================================================================
+# Copyright 2014 ZBackup contributors
+#
+# Distributed under the OSI-approved BSD License (the "License");
+# see accompanying file Copyright.txt for details.
+#
+# This software is distributed WITHOUT ANY WARRANTY; without even the
+# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# See the License for more information.
+#=============================================================================
+# (To distribute this file outside of CMake, substitute the full
+#  License text for the above reference.)
+
+
+find_path(LIBUNWIND_INCLUDE_DIR libunwind.h )
+if(NOT EXISTS "${LIBUNWIND_INCLUDE_DIR}/unwind.h")
+  MESSAGE(FATAL_ERROR "found libunwind.h but corresponding unwind.h is absent!")
+  SET(LIBUNWIND_INCLUDE_DIR "")
+endif()
+
+find_library(LIBUNWIND_LIBRARY unwind)
+
+if(LIBUNWIND_INCLUDE_DIR AND EXISTS "${LIBUNWIND_INCLUDE_DIR}/libunwind-common.h")
+  file(STRINGS "${LIBUNWIND_INCLUDE_DIR}/libunwind-common.h" LIBUNWIND_HEADER_CONTENTS REGEX "#define UNW_VERSION_[A-Z]+\t[0-9]*")
+
+  string(REGEX REPLACE ".*#define UNW_VERSION_MAJOR\t([0-9]*).*" "\\1" LIBUNWIND_VERSION_MAJOR "${LIBUNWIND_HEADER_CONTENTS}")
+  string(REGEX REPLACE ".*#define UNW_VERSION_MINOR\t([0-9]*).*" "\\1" LIBUNWIND_VERSION_MINOR "${LIBUNWIND_HEADER_CONTENTS}")
+  string(REGEX REPLACE ".*#define UNW_VERSION_EXTRA\t([0-9]*).*" "\\1" LIBUNWIND_VERSION_EXTRA "${LIBUNWIND_HEADER_CONTENTS}")
+
+  if(LIBUNWIND_VERSION_EXTRA)
+    set(LIBUNWIND_VERSION_STRING "${LIBUNWIND_VERSION_MAJOR}.${LIBUNWIND_VERSION_MINOR}.${LIBUNWIND_VERSION_EXTRA}")
+  else(not LIBUNWIND_VERSION_EXTRA)
+    set(LIBUNWIND_VERSION_STRING "${LIBUNWIND_VERSION_MAJOR}.${LIBUNWIND_VERSION_MINOR}")
+  endif()
+  unset(LIBUNWIND_HEADER_CONTENTS)
+endif()
+
+if (LIBUNWIND_LIBRARY)
+  include(CheckSymbolExists)
+  set(CMAKE_REQUIRED_QUIET_SAVE ${CMAKE_REQUIRED_QUIET})
+  set(CMAKE_REQUIRED_QUIET ${LibUnwind_FIND_QUIETLY})
+  CHECK_SYMBOL_EXISTS(unw_getcontext "${LIBUNWIND_INCLUDE_DIR}/libunwind.h" LIBUNWIND_HAS_UNW_GETCONTEXT)
+  CHECK_SYMBOL_EXISTS(unw_init_local "${LIBUNWIND_INCLUDE_DIR}/libunwind.h" LIBUNWIND_HAS_UNW_INIT_LOCAL)
+  set(CMAKE_REQUIRED_QUIET ${CMAKE_REQUIRED_QUIET_SAVE})
+endif ()
+
+include(FindPackageHandleStandardArgs)
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(LibUnwind  REQUIRED_VARS  LIBUNWIND_INCLUDE_DIR
+                                                            LIBUNWIND_LIBRARY
+                                                            LIBUNWIND_HAS_UNW_GETCONTEXT
+                                                            LIBUNWIND_HAS_UNW_INIT_LOCAL
+                                             VERSION_VAR    LIBUNWIND_VERSION_STRING
+                                 )
+
+if (LIBUNWIND_FOUND)
+  set(LIBUNWIND_LIBRARIES ${LIBUNWIND_LIBRARY})
+  set(LIBUNWIND_INCLUDE_DIRS ${LIBUNWIND_INCLUDE_DIR})
+endif ()
+
+mark_as_advanced( LIBUNWIND_INCLUDE_DIR LIBUNWIND_LIBRARY )

debug.cc

@@ -2,3 +2,10 @@
 // Part of ZBackup. Licensed under GNU GPLv2 or later + OpenSSL, see LICENSE
 
 bool verboseMode = true;
+
+#ifndef NDEBUG
+#ifdef HAVE_LIBUNWIND
+#include "debug.hh"
+
+#endif
+#endif

debug.hh

@@ -12,9 +12,19 @@
 
 #define dPrintf( ... ) (fprintf( stderr, __VA_ARGS__ ))
 
+#ifdef HAVE_LIBUNWIND
+#define UNW_LOCAL_ONLY
+#include <libunwind.h>
+
+#define dPrintBacktrace( ... ) ()
+#else
+#define dPrintBacktrace( ... ) ()
+#endif
+
 #else
 
 #define dPrintf( ... )
+#define dPrintBacktrace( ... ) ()
 
 #endif
 

licenses/LICENSE

@@ -12,6 +12,10 @@ LICENSE-GPLV3.
 EXCEPTION: This distribution of ZBackup may be linked against OpenSSL
 according to the terms of the section below entitled "OpenSSL Exception."
 
+ADDITION: This distribution of ZBackup uses sources from CMake project
+which is distributed under the OSI-approved BSD 3-clause License.
+See LICENSE-CMAKE for details.
+
 This program is distributed in the hope that it will be useful, but
 WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General

licenses/LICENSE-CMAKE

@@ -0,0 +1,57 @@
+CMake - Cross Platform Makefile Generator
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+Copyright 2000-2011 Insight Software Consortium
+All rights reserved.
+
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+modification, are permitted provided that the following conditions
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+
+* 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.
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+* Neither the names of Kitware, Inc., the Insight Software Consortium,
+  nor the names of their contributors may be used to endorse or promote
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