Special macros

In addition to those macros which you can create yourself, there are a few macros which are used internally by the make program. Here are some of those, listed below:

CC: Contains the current C compiler. Defaults to cc.
CFLAGS: Special options which are added to the built-in C rule. (See next page.)
$@: Full name of the current target.
$?: A list of files for current dependency which are out-of-date.
$<: The source file of the current (single) dependency.

You can also manipulate the way these macros are evaluated, as follows, assuming that OBJS = data.o io.o main.o, using $(OBJS:.o=.c) within the Makefile substitutes .o at the end with .c, giving you the following result: data.c io.c main.c

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