Roland Ver. 4.5 Informações Técnicas descarregar pdf (Página 141)

Chapter 11: Using make to Update Archive Files 131

(see Section 11.2 [Archive Update], page 129). But they are retained for compatibility with

other makes.

To write a suﬃx rule for archives, you simply write a suﬃx rule using the target suﬃx

‘.a’ (the usual suﬃx for archive ﬁles). For example, here is the old-fashioned suﬃx rule to

update a library archive from C source ﬁles:

.c.a:

$(CC) $(CFLAGS) $(CPPFLAGS) -c $< -o $*.o

$(AR) r $@ $*.o

$(RM) $*.o

This works just as if you had written the pattern rule:

(%.o): %.c

$(CC) $(CFLAGS) $(CPPFLAGS) -c $< -o $*.o

$(AR) r $@ $*.o

$(RM) $*.o

In fact, this is just what make does when it sees a suﬃx rule with ‘.a’ as the target

suﬃx. Any double-suﬃx rule ‘.x.a’ is converted to a pattern rule with the target pattern

‘(%.o)’ and a prerequisite pattern of ‘%.x’.

Since you might want to use ‘.a’ as the suﬃx for some other kind of ﬁle, make also

converts archive suﬃx rules to pattern rules in the normal way (see Section 10.7 [Suﬃx

Rules], page 125). Thus a double-suﬃx rule ‘.x.a’ produces two pattern rules: ‘(%.o):

%.x’ and ‘%.a: %.x’.

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Roland Ver. 4.5 Informações Técnicas Página 141