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What you want can be achieved with #ifdef. Since debug mode commonly sets -DDEBUG=1 (or -DDBG=1, you can easily control it either way), you can check for it to determine the mode you are in:

#ifdef DEBUG
static constexpr const char* mode = "debug";
#else
static constexpr const char* mode = "release";
#endif

printf("You are in %s mode\n", mode);

Other config options can be passed as preprocessor flags in the same way.

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