Thread: C++ Debug messages

  1. 07-19-2007 #1
    creativeinspira
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    C++ Debug messages

    Hi everybody. I was wondering if there is a way in C++ to have debug messages, and the ability to turn them off. For example, lets say I would like my program to have two modes. One mode is the mode where all the debug messages are printed, and another where they are not. Is it possible to do through the compiler? Ie to choose whether to compile the program with the debug info? I looked some stuff on google, and found some strange way in Visual C++. How about g++? Example would be great too. Thanks in advance.
  2. 07-19-2007 #2
    QuestionC
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    Use the macro "NDEBUG" to indicate when something is a release build... so for example...

    Code:
    some_sort_function () {
#ifndef NDEBUG
   // Only use the timer if it is a debug build
   TimingInformation timer ("some_sort_function()");
#endif
   // Lots of code
}
    Note that assert() changes behavior depending on whether NDEBUG is defined.
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  3. 07-19-2007 #3
    creativeinspira
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    Thank you. So I can just do #define NDEBUG in my main file, and then all the code between #ifndef and #endif will be deactivated?
  4. 07-20-2007 #4
    Salem
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    > So I can just do #define NDEBUG in my main file, and then all the code between #ifndef and #endif will be deactivated?
    It is the standard macro name for this kind of thing, so your IDE should automatically declare it in the release build.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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