labath added a comment.

In https://reviews.llvm.org/D41725#969183, @mgorny wrote:

> Maybe we could. I presumed people are using the separate variables for some 
> reason. We'd have to check that it's properly sanitized when building in-tree 
> and given to cmake though.


I would expect that reason is purely historical. While working on that patch I 
got the feeling that there is a lot of confusion in how to check for zlib 
presence. All everyone wants to know is whether zlib is present and working, so 
there should not be a need for different checks. We certainly don't need 
anything fancy here.


https://reviews.llvm.org/D41725



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