You can write a special kind of suffix rule for dealing with archive
files. See section Old-Fashioned Suffix Rules, for a full explanation of suffix rules.
Archive suffix rules are obsolete in GNU
make, because pattern
rules for archives are a more general mechanism (see section Implicit Rule for Archive Member Targets). But they are retained for compatibility with other
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 dependency pattern of `%.x'.
Since you might want to use `.a' as the suffix for some other kind
make also converts archive suffix rules to pattern rules
in the normal way (see section Old-Fashioned Suffix Rules). Thus a double-suffix rule
`.x.a' produces two pattern rules: `(%.o):
%.x' and `%.a: %.x'.
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