c library does not allow disable debug without changing the code

[ArFe]

The c library defines #define SPARKPLUG_DEBUG 1 in the code.

That prevents anyone from disabling the debug print without changing the code, as DEBUG_PRINT is defined if SPARKPLUG_DEBUG is defined or not.

tahu/c/core/include/tahu.h

Lines 31 to 38 in d6552c9

	// Enable/disable debug messages
	#define SPARKPLUG_DEBUG 1
	#ifdef SPARKPLUG_DEBUG
	#define DEBUG_PRINT(...) printf(__VA_ARGS__)
	#else
	#define DEBUG_PRINT(...) do {} while (0)
	#endif

If you change the code you have to disclose your source code, as per the license, which makes it hard to use it in professional projects.

[wes-johnson]

If you want to resubmit a PR against a Github account where you've signed the ECA, I'm fine to accept this. I also am not a lawyer, but I'm not sure your interpretation of the Eclipse Public License is entirely correct. Regardless, I'll leave this open for a while if you want to resubmit that PR.