Overriding of Macro Values

The initial values of makefile macros can be overridden with command-line options to make. For example, suppose you have the following line at the top of makefile:

FFLAGS=-u

and the compile-line of computepts.f:

f77 $(FFLAGS) -c computepts.f

and the final link:

f77 $(FFLAGS) $(OBJ) -lcore77 -lcore -lsunwindow \ lpixrect -o pattern

Now a simple make command without arguments uses the value of FFLAGS set above. However, this can be overridden from the command line:

demo% make "FFLAGS=-u -O"

Here, the definition of the FFLAGS macro on the make command line overrides the makefile initialization, and both the -O flag and the -u flag are passed to f77. Note that "FFLAGS=" can also be used on the command line to reset the macro so that it has no effect.

You can use the Make Macros dialog box in Sun WorkShop to override the value of a macro (see "Using Makefile Macros").