What can be the cause of "use of undeclared identifier LOG_LEVEL_VERBOSE" message

ios cocoalumberjack
Lukasz 'Severiaan' Grela picture Lukasz 'Severiaan' Grela · Aug 4, 2014 · Viewed 9.9k times · Source

I'm trying to configure cocoalumberjack and when I've added ddLogLevel set to LOG_LEVEL_VERBOSE XCode throws "use of undeclared identifier" error. Why is that? How to avoid?

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Answer

Droppy picture Droppy · Aug 4, 2014

This question indicates that clearing DerivedData and restarting Xcode solves this kind of error.

However you should not include variables in the pre-compiled header as it will be included in every source file and prefix files are somewhat complicated compared to normal header files.

Better is to have use a Constants.h file which contains:

extern int ddLogLevel;

and #import that into your prefix file.

Then create an Constants.m with:

int ddLogLevel =
#ifdef DEBUG
                 LOG_LEVEL_VERBOSE;
#else
                 LOG_LEVEL_ERROR;
#endif

This way there is only one instance of ddLogLevel and it can be easily changed at runtime if necessary.

See this question for hints about prefix file best practices.

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