This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21 Core Issues List revision 112e. See http://www.open-std.org/jtc1/sc22/wg21/ for the official list.
[Accepted as a DR at the February, 2019 meeting.]
Whether an implementation is hosted or freestanding is only required to be documented by the value of the __STDC_HOSTED__ macro (15.11 [cpp.predefined]). Should this characteristic be classified as implementation-defined, thus requiring documentation?
Proposed resolution (January, 2019):
Change 18.104.22.168 [compliance] paragraph 1 as follows:
Two kinds of implementations are defined: hosted and freestanding (4.1 [intro.compliance]) . For a hosted implementation, this document describes the set of available headers.