autoconf: Single Suffix Rules
1
1 12.19 Single Suffix Rules and Separated Dependencies
1 ====================================================
1
1 A "Single Suffix Rule" is basically a usual suffix (inference) rule
1 (`.from.to:'), but which _destination_ suffix is empty (`.from:').
1
1 "Separated dependencies" simply refers to listing the prerequisite
1 of a target, without defining a rule. Usually one can list on the one
1 hand side, the rules, and on the other hand side, the dependencies.
1
1 Solaris `make' does not support separated dependencies for targets
1 defined by single suffix rules:
1
1 $ cat Makefile
1 .SUFFIXES: .in
1 foo: foo.in
1 .in:
1 cp $< $@
1 $ touch foo.in
1 $ make
1 $ ls
1 Makefile foo.in
1
1 while GNU Make does:
1
1 $ gmake
1 cp foo.in foo
1 $ ls
1 Makefile foo foo.in
1
1 Note it works without the `foo: foo.in' dependency.
1
1 $ cat Makefile
1 .SUFFIXES: .in
1 .in:
1 cp $< $@
1 $ make foo
1 cp foo.in foo
1
1 and it works with double suffix inference rules:
1
1 $ cat Makefile
1 foo.out: foo.in
1 .SUFFIXES: .in .out
1 .in.out:
1 cp $< $@
1 $ make
1 cp foo.in foo.out
1
1 As a result, in such a case, you have to write target rules.
1