11.14 Single Suffix Rules and Separated Dependencies
A Single Suffix Rule is basically a usual suffix (inference) rule
(‘.from.to:’), but which destination suffix is empty
(‘.from:’).
Separated dependencies simply refers to listing the prerequisite
of a target, without defining a rule. Usually one can list on the one
hand side, the rules, and on the other hand side, the dependencies.
Solaris make does not support separated dependencies for
targets defined by single suffix rules:
$ cat Makefile
.SUFFIXES: .in
foo: foo.in
.in:
cp $< [email protected]
$ touch foo.in
$ make
$ ls
Makefile foo.in
while GNU Make does:
$ gmake
cp foo.in foo
$ ls
Makefile foo foo.in
Note it works without the ‘foo: foo.in’ dependency.
$ cat Makefile
.SUFFIXES: .in
.in:
cp $< [email protected]
$ make foo
cp foo.in foo
and it works with double suffix inference rules:
$ cat Makefile
foo.out: foo.in
.SUFFIXES: .in .out
.in.out:
cp $< [email protected]
$ make
cp foo.in foo.out
As a result, in such a case, you have to write target rules.
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