9.8. Disable Logging Module

Setting the Verbosity Level, translates into entries not being added to the log queue if the entry’s level has lower importance than the set one. This check is performed when calling the macros defined in Logging Messages. However, it is possible to fully disable each macro (and therefore each verbosity level individually) at build time.

  • logInfo is fully disabled by either:

    • Setting CMake option LOG_NO_INFO to ON (default for Single-Config generators if CMAKE_BUILD_TYPE is other than Debug).

    • Defining macro HAVE_LOG_NO_INFO to 1.

  • logWarning is fully disabled by either:

    • Setting CMake option LOG_NO_WARNING to ON.

    • Defining macro HAVE_LOG_NO_WARNING to 1.

  • logError is fully disabled by either:

    • Setting CMake option LOG_NO_ERROR to ON.

    • Defining macro HAVE_LOG_NO_ERROR to 1.

Applying either of the previously described methods will set the macro to be empty at configuration time, thus allowing the compiler to optimize the call out. This is done so that all the debugging messages present on the library are optimized out at build time if not building for debugging purposes, thus preventing them to impact performance.

INTERNAL_DEBUG CMake option activates log macros compilation, so the arguments of the macros are compiled. However:

  • It does not activate the log Warning and Error messages, i.e. the messages are not written in the log queue.

  • logInfo has a special behaviour to simplify working with Multi-Config capability IDEs. If CMake option LOG_NO_INFO is OFF, or the C++ definition HAVE_LOG_NO_INFO is 0, then logging is enabled only for Debug configuration. In this scenario, setting FASTDDS_ENFORCE_LOG_INFO to ON will enable logInfo even on non Debug configurations. This is specially useful when using the Fast DDS’ logging module in an external application which links with Fast DDS compiled in Release. In that case, applications wanting to use all three levels of logging can simply add the following code prior to including any Fast DDS header:

    #define HAVE_LOG_NO_INFO 0
#define FASTDDS_ENFORCE_LOG_INFO 1

Warning

INTERNAL_DEBUG can be automatically set to ON if CMake option EPROSIMA_BUILD is set to ON.