[cmake-developers] The lib64 case

[Rolf Eike Beer]

I have seen a strange behaviour on my (openSUSE) Linux host running on AMD64. 
Sometimes during my Find* module tests libraries in /usr/lib64 were not found. 
It took me a while until I noticed what was going on there: 
FIND_LIBRARY_USE_LIB64_PATHS is not set when I used project(... NONE). While 
this sounds logical maybe the find_library() documentation should be updated to 
say that some language needs to be enabled for it to properly work.

While searching the reason of this behaviour I of course did a "git grep 
lib64" and found a bunch of Find* modules that manually specify lib64 as suffix. 
Also most of them also specified "lib" as a path suffix, which is according to my 
understanding totally unneeded as find_library() will automatically add this 
suffix. Am I correct? Then I would go in the next days and throw them both out. 
Is same is true for find_path() and include suffix?

Greetings,

Eike
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