Makefile: Difference between revisions

 

Now comes the dependency magic I talked about earlier. Note that this needs GCC 3.3 or newer.

%.o: %.c Makefile

@$(CC) $(CFLAGS) -MMD -MP -c $< -o $@

Isn't it a beauty? ;-)

 

Of course we also need a rule for generating the test driver executables (and their dependency files):

 

%_t: %.c Makefile pdclib.a

@$(CC) $(CFLAGS) -MMD -MP -DTEST $< pdclib.a -o $@

 

Here you can see why test driver executables get a ''*_t'' suffix instead of a ''*.t'' extension: The ''-MMD'' option uses the basename (i.e., filename without extension) of the ''compiled'' file as basis for the dependency file. If we would compile the sources into ''abc.o'' and ''abc.t'', the dependency files would both be named ''abc.d'', overwriting each other.