Added logging function.

Author: redboltz

Diff for: CMakeLists.txt

@@ -120,7 +120,7 @@ ENDIF ()
 SET (Boost_USE_MULTITHREADED ON)
 FIND_PACKAGE (Threads REQUIRED)
 
-FIND_PACKAGE (Boost 1.67.0 REQUIRED COMPONENTS system date_time)
+FIND_PACKAGE (Boost 1.67.0 REQUIRED COMPONENTS system date_time log)
 
 IF (MQTT_USE_TLS)
     FIND_PACKAGE (OpenSSL REQUIRED)

Diff for: example/CMakeLists.txt

@@ -7,6 +7,7 @@ LIST (APPEND exec_PROGRAMS
     v5_no_tls_server.cpp
     v5_no_tls_both.cpp
     v5_no_tls_prop.cpp
+    logging.cpp
     redirect.cpp
     broker.cpp
 )
@@ -43,7 +44,8 @@ ENDIF ()
 FOREACH (source_file ${exec_PROGRAMS})
     GET_FILENAME_COMPONENT (source_file_we ${source_file} NAME_WE)
     ADD_EXECUTABLE (${source_file_we} ${source_file})
-    TARGET_LINK_LIBRARIES (${source_file_we} mqtt_cpp_iface)
+    TARGET_COMPILE_DEFINITIONS (${source_file_we} PUBLIC $<IF:$<BOOL:${MQTT_USE_STATIC_BOOST}>,,BOOST_LOG_DYN_LINK>)
+    TARGET_LINK_LIBRARIES (${source_file_we} mqtt_cpp_iface Boost::log)
 ENDFOREACH ()
 
 IF ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")

Diff for: example/broker.cpp

@@ -1,7 +1,9 @@
 #include "../test/test_server_no_tls.hpp"
 #include "../test/test_broker.hpp"
+#include <mqtt/setup_log.hpp>
 
 int main() {
+    MQTT_NS::setup_log();
     boost::asio::io_context ioc;
     test_broker b(ioc);
     test_server_no_tls s(ioc, b);