* Drop the export attribute on forward declaration
They don't mean anything on forward declarations anyways.
* Fixed -Wunused-parameter warnings in some C++ files
Allowed all the attribute #defines to work in C++ also.
* Fixed -Wunused-variable warnings by removing dead code
* Fixed all -Wshorten-64-to-32 warnings by adjusting casts
There was no truncation in fact, since the unsigned result was upcast to size_t then implicitly downcast to uint32_t.
* Fixed all -Wcomma warnings by spliting statements onto own lines
* Fixed all -Wself-assign warnings with different unused param suppression
* Fixed all -Wextra-semi warnings
* Fixed all -Wswitch-enum warnings
Just added new explicit cases with the existing default case.
* Fixed all -Wmissing-prototypes warnings
Just made functions static. Moved them into an extern "C" block.
* Reformatted source with bin/format_source using clang version 10.0.1
Co-authored-by: Larry Knox <lrknox@hdfgroup.org>
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