Portability/Configuration/Building (40)

Abbreviations

To simplify writing rules, make provides default abbreviations:

`$@`		full name of target
`$*`		name of target, without suffix
`$<`		full name of first source
`$?`		full names of all newer sources

Examples:

# one of above rules, re-written
lex.o : lex.c mycc.h lex.h
        $(CC) $(CFLAGS) -c $*.c -o $@
	# or ... $(CC) $(CFLAGS) -c $< -o $@

# update a library archive
lib.a: foo.o bar.o lose.o win.o
	ar r lib.a $?