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I’m somewhat new to C and just discovered something interesting. I changed the value of a simple macro that was #defined in a header file
#define MRB 1000
to
#define MRB 100
and when I ran make again, it said there were no changes (“nothing to be done for ‘all'”).
How exactly do macros work such that they don’t need to be part of a build?
This has a lot more to do with how make works than how macros work. If it doesn’t require a rebuild, then you have specified your dependencies incorrectly. Read up on
makedepend.