From a6be89461fec308f187f811ad952fc2b4019c561 Mon Sep 17 00:00:00 2001
From: OBATA Akio <obache@wizdas.com>
Date: Sun, 16 Aug 2020 18:15:33 +0900
Subject: [PATCH] Allow to use backtrace(3) external library for kdebug

Signed-off-by: OBATA Akio <obache@wizdas.com>
(cherry picked from commit 2167207adc49b498536a5a8533c27fc67e0c6e9c)
---
 CMakeLists.txt     | 13 ++++++++++++-
 config.h.cmake     |  5 ++++-
 tdecore/kdebug.cpp |  6 +++++-
 3 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9f646b13e..d1b2c29a0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -330,7 +330,18 @@ check_symbol_exists( gethostbyname2_r "netdb.h" HAVE_GETHOSTBYNAME2_R )
 check_symbol_exists( gethostbyname_r "netdb.h" HAVE_GETHOSTBYNAME_R )
 check_symbol_exists( gai_strerror "sys/types.h;sys/socket.h;netdb.h" HAVE_GAI_STRERROR )
 check_symbol_exists( getaddrinfo "sys/types.h;sys/socket.h;netdb.h" HAVE_GETADDRINFO )
-check_symbol_exists( backtrace "execinfo.h" HAVE_BACKTRACE )
+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 )
+  endif ()
+endif ()
 check_cxx_source_compiles( "#include <cxxabi.h>
     int main() { abi::__cxa_demangle(0, 0, 0, 0); return 0; }"
     HAVE_ABI_CXA_DEMANGLE )
diff --git a/config.h.cmake b/config.h.cmake
index c7c9e116b..8900f2e86 100644
--- a/config.h.cmake
+++ b/config.h.cmake
@@ -66,8 +66,11 @@
 /* Define if you have strvercmp prototype */
 #cmakedefine HAVE_STRVERCMP_PROTO 1
 
-/* Define to 1 if execinfo.h exists and defines backtrace (GLIBC >= 2.1) */
+/* Define to 1 if GLIBC >= 2.1 compatible backtrace facility exists */
 #cmakedefine HAVE_BACKTRACE 1
+#ifdef HAVE_BACKTRACE
+#define BACKTRACE_H <@Backtrace_HEADER@>
+#endif
 
 /* Define to 1 if gcc (or may be some over compiller) provides abi::__cxa_demangle() */
 #cmakedefine HAVE_ABI_CXA_DEMANGLE 1
diff --git a/tdecore/kdebug.cpp b/tdecore/kdebug.cpp
index d906f67fc..9cc32225c 100644
--- a/tdecore/kdebug.cpp
+++ b/tdecore/kdebug.cpp
@@ -59,7 +59,11 @@
 #include <config.h>
 
 #ifdef HAVE_BACKTRACE
-#include <execinfo.h>
+#include BACKTRACE_H
+
+#ifdef HAVE_DLFCN_H
+#include <dlfcn.h>
+#endif
 
 #ifdef HAVE_ABI_CXA_DEMANGLE
 #include <cxxabi.h>