-include filename does not show correct dependency errors

[willard]

When using the "-include filename"(instead of just "include filename"), if
this filename includes dependencies that are missing, makefile does not show
those missing dependencies...

For example, if using:

-include foo.d

with foo.d being:

foo.o: foo.c xxx.h

Let's say xxx.h does not exist (and cannot be generated) , the make fails,
but it does not say it's because of xxx.h missing.

If instead, this is used:

include foo.d

then it works fine...

I understand that the '-' in front of include means that THIS file 'foo.d'
should not itself generate an error, but I would expect the content of foo.d
to be used normally....

Looks like a bug to me.
Btw, I am using make 3.81.

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