[PATCH] D106577: [clang] Define __STDC_ISO_10646__

[Aaron Ballman via Phabricator via cfe-commits]

aaron.ballman added a comment.

In D106577#2897522 <https://reviews.llvm.org/D106577#2897522>, @jyknight wrote:

> I'm not sure we should be populating this.
>
> The _value_ is determined by what libc supports, so it probably needs to be left up to libc to define it.

Why is the value determined by what libc supports? The definition from the standard is:

  If this symbol is defined, then every character in the Unicode required set, when stored in an
  object of type wchar_t, has the same value as the short identifier of that character.

That doesn't seem to imply anything about the library, just the size of `wchar_t`.


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