Issue 3199 - WG21 CWG Issues
Title
Missing predefined macros for chart16_t and char32_t
Status
tentatively ready
Section
15.12 [cpp.predefined]
Submitter
Jason Merrill

Created on 2013-01-29.00:00:00 last changed 2 weeks ago

Messages

msg8602 (view)
Date: 2026-06-26.22:53:47

Proposed resolution (approved by CWG 2026-06-26):

Change in 15.12 [cpp.predefined] paragraph 1 as follows:

...
__STDC_HOSTED__
The integer literal 1 if the implementation is a hosted implementation or the integer literal 0 if it is a freestanding implementation (4.1 [intro.compliance]).
__STDC_UTF_16__
The integer literal 1.
__STDC_UTF_32__
The integer literal 1.
msg8601 (view)
Date: 2026-06-26.22:53:47

(Originally submitted as LWG issue 2237.)

The macros __STDC_UTF_16__ and __STDC_UTF_32__ are predefined by a C implementation. C++ is missing them.
History
Date User Action Args
2026-06-26 22:53:47adminsetstatus: open -> tentatively ready
2026-06-11 21:47:15adminsetmessages: + msg8602
2013-01-29 00:00:00admincreate