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Add -std=c++20 flag, replace C++2a with C++20 throughout the Clang user…

Authored by rsmith on Feb 18 2020, 4:13 PM.

Description

Add -std=c++20 flag, replace C++2a with C++20 throughout the Clang user interface and documentation, and update __cplusplus for C++20.

WG21 considers the C++20 standard to be finished (even though it still
has some more steps to pass through in the ISO process).

The old flag names are accepted for compatibility, as usual, and we
still have lots of references to C++2a in comments and identifiers;
those can be cleaned up separately.

Details

Committed
rsmithFeb 18 2020, 4:16 PM
Parents
rG7a4ddfb774aa: [gn build] Port ca9ba76481f
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