Add a backtrace function and library detection.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>

config.h.cmake

@@ -5,3 +5,9 @@
 
 // kbabeldict/modules/dbsearchengine
 #cmakedefine USE_DB_H_PATH <@USE_DB_H_PATH@>
+
+/* Define to 1 if GLIBC >= 2.1 compatible backtrace facility exists */
+#cmakedefine HAVE_BACKTRACE 1
+#ifdef HAVE_BACKTRACE
+#define BACKTRACE_H <@Backtrace_HEADER@>
+#endif

kmtrace/CMakeLists.txt

@@ -12,6 +12,7 @@
 include_directories(
   ${TDE_INCLUDE_DIR}
   ${TQT_INCLUDE_DIRS}
+  ${CMAKE_BINARY_DIR}
 )
 
 link_directories(
@@ -21,6 +22,11 @@ link_directories(
 set( LD_FLAGS "-Wl,-Bstatic -liberty -Wl,-Bdynamic" )
 
 
+##### configure checks ##########################
+
+include( ConfigureChecks.cmake )
+
+
 ##### other data ################################
 
 configure_file( kminspector.cmake kminspector @ONLY )
@@ -48,7 +54,7 @@ tde_add_library( ktrace_s STATIC
 
 tde_add_library( ktrace SHARED
   SOURCES ksotrace.cpp ktrace.c
-  LINK dl
+  LINK ${DL_LIBRARIES} ${Backtrace_LIBRARY}
   DESTINATION ${LIB_INSTALL_DIR}/kmtrace
 )
 

kmtrace/ConfigureChecks.cmake

@@ -0,0 +1,18 @@
+
+##### check if GLIBC >= 2.1 compatible backtrace facility exists
+
+if ( CMAKE_MAJOR_VERSION LESS "3" )
+  check_symbol_exists( backtrace "execinfo.h" HAVE_BACKTRACE )
+  if ( HAVE_BACKTRACE )
+    set ( Backtrace_LIBRARY "" )
+    set ( Backtrace_HEADER "execinfo.h" )
+  endif ()
+else ()
+  find_package( Backtrace )
+  if ( Backtrace_FOUND )
+    set ( HAVE_BACKTRACE 1 CACHE INTERNAL "" )
+  endif ()
+endif ()
+if( NOT HAVE_BACKTRACE )
+  tde_message_fatal( "bactrace function is required but not available on your system")
+endif()

kmtrace/ktrace.c

@@ -25,6 +25,10 @@
    or (US mail) as Mike Haertel c/o Free Software Foundation.
 */
 
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
 #define MALLOC_HOOKS
 #define _GNU_SOURCE
 
@@ -35,8 +39,8 @@
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
-#include <execinfo.h>
 #include <unistd.h>
+#include BACKTRACE_H
 
 #ifdef USE_IN_LIBIO
 # include <libio/iolibio.h>