How to disable default log

[saurabhmnnit09]

See , I am using configfromglobal function and I don't want myeasylog.log file to be created. I tried disabling the macro for default log but still myeasylog.log is being made

[chrisniael]

Define the macro ELPP_NO_DEFAULT_LOG_FILE using -D option of compiler, for example in case of g++ you need do g++ source.cpp ... -DELPP_NO_DEFAULT_LOG_FILE .... And if you are using cmake system, you should define the macro in the CMakeLists.txt, set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DELPP_NO_DEFAULT_LOG_FILE")

[rdiachenko]

@chrisniael , how should I define this macro in Visual Studio?
This doesn't work:

#define ELPP_NO_DEFAULT_LOG_FILE
#include "easylogging++.h"

INITIALIZE_EASYLOGGINGPP

[chrisniael]

@rdiachenko

To set this compiler option in the Visual Studio development environment

1. Open the project Property Pages dialog box. For more information, see How to: Open Project Property Pages.
2. In the left pane, select Configuration Properties, C/C++, Preprocessor.
3. In the right pane, in the right-hand column of the Preprocessor Definitions property, open the drop-down menu and choose Edit.
4. In the Preprocessor Definitions dialog box, add (one per line), modify, or delete one or more definitions. Choose OK to save your changes.

Refer to Microsoft's reference document /D (Preprocessor Definitions)

[rdiachenko]

@chrisniael , thanks, it works specifying ELPP_NO_DEFAULT_LOG_FILE in the aforementioned way.
Any ideas why #define ELPP_NO_DEFAULT_LOG_FILE doesn't work?

[chrisniael]

@rdiachenko I assume your code file name is main.cpp, where define the macro ELPP_NO_DEFAULT_LOG_FILE, as your said above:

//main.cpp
#define ELPP_NO_DEFAULT_LOG_FILE
#include "easylogging++.h"

INITIALIZE_EASYLOGGINGPP

when the compiler build your project, it has many steps. one of these steps is to compile easylogging++.cpp and main.cpp to their object files separately (easylogging++.o and main.o), when compiling easylogging++.cpp, the compiler don't find the macro define ELPP_NO_DEFAULT_LOG_FILE in its dependent files(easylogging++.h), because the macro define ELPP_NO_DEFAULT_LOG_FILE is only in the main.cpp.

[rdiachenko]

@chrisniael thanks for explanation, it makes things clear for now. Looks like it does make sense to add your note to README

[chrisniael]

@rdiachenko You're welcome : )

[mage-game]

@chrisniael Thanks for your explanation

[rdiachenko]

I suppose this issue can be closed. The pull request with clarifications for macros configuration was applied - #597