With the following makefile:

.SUFFIXES:
.SUFFIXES: .a .b

all: .PHONY x.b

.a.b:
        echo $<

x.b: dir/x.a

make tries to generate x.b using the commands from the .a.b suffix rule,
but using the source file dir/x.a, rather that the source
file implied by the suffix rule.

I'm not sure this is (ever) desirable.
Note that it requies the filename to match - so it will only ever
build x.a, never y.a using the commands from the suffix rule.

It causes particular problems when the 'x.b: dir/x.a' line comes
from the .depend file which also contains '.OPTIONAL: dir/x.a' and
the source files have all been moved to a different directory.

Does anyone think this is a desirable feature?
If I fix it, is anything else likely to break?

	David

-- 
David Laight: david@l8s.co.uk