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[clang][DOC] Document module mangler changes
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Authored by urnathan on Feb 17 2022, 1:23 PM.

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Summary

Note that the mangling has changed and the demangler's learnt a new trick. Obviously dependent upon the mangler and demangler patches.

urnathan requested review of this revision.Feb 17 2022, 1:23 PM

urnathan created this revision.

LGTM.

This revision is now accepted and ready to land.Feb 17 2022, 10:04 PM

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	C++ Language Changes in Clang			C++ Language Changes in Clang
	-----------------------------			-----------------------------

	- ...			- ...

	C++20 Feature Support			C++20 Feature Support
	^^^^^^^^^^^^^^^^^^^^^			^^^^^^^^^^^^^^^^^^^^^

				- The mangling scheme for modules has incompatibally changed. The
				initial mangling was discovered not to be reversible, and the weak
				ownership design decision did not give the backwards compatibility
				that was hoped for. C++20 since added ``extern "C++"`` semantics
				that can be used for that. The demangler now demangles symbols with
				named module attachment.

	C++2b Feature Support			C++2b Feature Support
	^^^^^^^^^^^^^^^^^^^^^			^^^^^^^^^^^^^^^^^^^^^

	- Implemented `P2128R6: Multidimensional subscript operator <https://wg21.link/P2128R6>`_.			- Implemented `P2128R6: Multidimensional subscript operator <https://wg21.link/P2128R6>`_.

	CUDA Language Changes in Clang			CUDA Language Changes in Clang
	------------------------------			------------------------------

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