check_library_exists cannot find snappy package correctly about leveldb

[daniel-meilak]

I'm having the same issue. I build both snappy and leveldb using FetchContent, and to solve this currently, I am setting HAVE_SNAPPY to true (something like this: set(HAVE_SNAPPY ON CACHE BOOL "" FORCE)), before building leveldb.

It seems to work however I assume that this is dependent on snappy building before leveldb to work.

Here is my CMakeLists.txt: CMakeLists.txt

I can see that check_library_exists is used to find snappy, however the LOCATION variable is simply set to "" which, I assume, means that it will only look in the default system locations for snappy, i.e. it has to be installed previously, and you must have install permissions.

Would love to know if there is a proper way to build both snappy & leveldb in my project and have them link correctly.