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This addresses the illegal instruction issue when -flto flag is used (link time optimization) as details in this thread
https://bugzilla.redhat.com/show_bug.cgi?id=2307795
It is not clear to me why the problem is happening.
The solution was to move the call to initialize the encoder tables from a static call to initialize a global static variable to a call during code execution, named initialize_block_encoder_tables().
The other changes are also to remove LTO compiler warnings.
I also updated FetchContent_Populate to FetchContent_MakeAvailable.