VPATH Object file search optimization

[Ricky Venable]

I've noticed that my makefile had a good deal of overhead looking for object 
files. For a clean build, my makefile searches through all of VPATH looking 
for the object files. I only store object files in one directory, so it is a 
waste of time for make to search all of the source directories for object 
files, when I know they are not in there.
I hoped that the statement "vpath %.o" would clear the path for all .o 
files, but of course it still looks through all of the VPATH directories.
The only solution I can think of is to not even use VPATH, but to use vpath 
for each of my file types. This of course looks more clumsy, so I am 
wondering if there is another way.

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