LOCAL_C, LOCAL_D, GLREF_C, GLREF_D, GLDEF_C and GLDEF_D are all defined in e32def.h as:
#define GLREF_D extern
#define GLDEF_D
#define LOCAL_D static
#define GLREF_C extern
#define GLDEF_C
#define LOCAL_C static
The _C and _D suffixes are a convention. _D indicates a data declaration, and _C a code one.
So LOCAL_D is used to indicate a static data while LOCAL_C indicates static code.
By contrast, GLREF_C and GLREF_D, by contrast, are used to indicated GLobal REFerences (i.e. extern), and GLDEF_C and GLDEF_D indicate GLobal DEFinitions. These terms don’t have a formal definition but are used as markers for functions or variables which have been declared as GLREF_C or GLREF_D respectively elsewhere.
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