[CMake] a cmake module that improves upon CheckLibrariesExists

[Joachim Wuttke]

may I invite your comments at

http://codereview.stackexchange.com/questions/105020/a-cmake-module-that-improves-upon-checklibrariesexists

where I am proposing a module AssertLibraryFunction that improves
upon CheckLibrariesExists in two respects:

- It honors the optional argument REQUIRED of find_package: if the check 
fails, it raises a FATAL_ERROR. It also honors QUIET.
- Its result is cached in a variable named ${LIBNAME}_${FUNCTION}. 
Therefore, argument 4 of CheckLibrariesExists, VARIABLE, is no longer 
needed.

Thanks for any feedback (preferentially on said codereview site,
if that is compatible with etiquette at this mailing list),

Joachim


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