Add include-what-you-use support to CMake

[derobins]

Adds an HDF5_USE_IWYU option to CMake (default OFF).
This will run the include-what-you-use tool while compiling.

See https://include-what-you-use.org/ for more information.

This requires include-what-you-use to be installed.

Addresses #6001

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Important

Adds HDF5_USE_IWYU option to CMake to run include-what-you-use during compilation, documented in CHANGELOG.md.

• CMake Configuration:
  • Adds HDF5_USE_IWYU option to CMakeLists.txt to run include-what-you-use during compilation (default OFF).
  • Requires include-what-you-use to be installed.
• Documentation:
  • Updates CHANGELOG.md to document the new HDF5_USE_IWYU option.

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[derobins]

The suggestions it emits are not very useful at this time due to the way we use H5public.h / H5private.h and the large number of implicit includes in the code. It'll be a useful tool when fixing problems, though.

Definitely don't want to run the auto-fix tool - that'd make a huge mess...

[byrnHDF]

Adds include-what-you-use to code compiled after this macro. All arguments are

added to the include-what-you-use application call in the form of

include-what-you-use ${ARGN}.

This is in the tools.cmake file under config/sanitizer

[derobins]

Adds include-what-you-use to code compiled after this macro. All arguments are

added to the include-what-you-use application call in the form of

include-what-you-use ${ARGN}.

This is in the tools.cmake file under config/sanitizer

So should this be closed?

[byrnHDF]

So should this be closed?

IDK, are they the same and does the tools.cmake one work?