Updated the H5_ATTR_* macros.
- Updated the preprocessor logic that defines the H5_ATTR_* macros. The Solaris
Studio compiler understands __attribute__ but not the specific attributes
that we use. The H5_ATTR_* macros are now defined as blank with that
compiler which significantly cleans up the warnings, making debugging
easier.
- Replaced a few lingering __attribute__ macros with H5_ATTR_* markup.
Tested on: h5committest
Solaris w/ Solaris Studio (emu)
- Add a new attribute function characterstic for format:
* H5_ATTR_FORMAT(X,Y,Z) __attribute__((format(X, Y, Z)))
- Rename UNUSED attribute characterstic to H5_ATTR_UNUSED.
- Rename NORETURN attribute characterstic to H5_ATTR_NORETURN
tested with h5committest.
Eliminates gcc warnings due to -Wunsuffixed-float-constants.
- Adds 'F' suffixes for most float constants.
- A few constants MUST be of type double. These now receive the long
double L suffix and are then cast to double. I do this via a new
H5_DOUBLE() macro which was added to H5private.h.
- Additionally, some 1.8-specific float suffixes were added.
Fixes: HDFFV-9148
Tested on: h5committest
