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I have been using something like this:
int main(int argc, char *argv[])
{
#ifdef DEBUG
printf("RUNNING DEBUG BUILD");
#else
printf("Running... this is a release build.");
#endif
...
However this requires me to compile with -DDEBUG for the debug build. Does GCC give me some way for me to determine when I am compiling with debug symbols (-g flag) such as defining its own preprocessor macro that I can check for?
Answer is no. Usually these macros (DEBUG, NDEBUG, _DEBUG) are set by the IDE/make system depending on which configuration (debug/release) you have active. I think these answers can be of help:
C #define macro for debug printing
Where does the -DNDEBUG normally come from?
_DEBUG vs NDEBUG