variable substitution refs [PATCH]

[Richard Boulton]

I've found another small bug with CVS automake: if a _SOURCES variable
is defined using a substitution reference to a variable, and the variable
being referenced is conditionally defined, the corresponding _OBJECTS
variable is defined without any value from the substitution reference.
eg: 

if COND
var = foo.c
else
var = foo.c
endif
foo_SOURCES = $(var:.a=.b)

sets foo_OBJECTS to empty.  I would expect foo_OBJECTS to contain foo.o.

I attach a patch which adds a regression test and a fix.
Unfortunately, the patch depends on my earlier submitted patch having been
applied already.

-- 
Richard

patch2
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