From 443e9d7cf59bb88f8920628405b2e1c6aaf770d0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sl=C3=A1vek=20Banko?= <slavek.banko@axis.cz>
Date: Wed, 15 Sep 2021 22:18:04 +0200
Subject: Add a backtrace function and library detection.
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Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit cf63191672fff12cd57892ba4642ed4f01e9c6a4)
---
 config.h.cmake                |  6 ++++++
 kmtrace/CMakeLists.txt        |  8 +++++++-
 kmtrace/ConfigureChecks.cmake | 18 ++++++++++++++++++
 kmtrace/ktrace.c              |  6 +++++-
 4 files changed, 36 insertions(+), 2 deletions(-)
 create mode 100644 kmtrace/ConfigureChecks.cmake

diff --git a/config.h.cmake b/config.h.cmake
index f1ac1ba4..d9eac5e5 100644
--- a/config.h.cmake
+++ b/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
diff --git a/kmtrace/CMakeLists.txt b/kmtrace/CMakeLists.txt
index c2551b0e..126a1013 100644
--- a/kmtrace/CMakeLists.txt
+++ b/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
 )
 
diff --git a/kmtrace/ConfigureChecks.cmake b/kmtrace/ConfigureChecks.cmake
new file mode 100644
index 00000000..5c06aac6
--- /dev/null
+++ b/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()
diff --git a/kmtrace/ktrace.c b/kmtrace/ktrace.c
index e7eee47b..dcc321e5 100644
--- a/kmtrace/ktrace.c
+++ b/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>
-- 
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