CWG2518 Conformance requirements and #error/#warning

[jensmaurer]

CWG2518

C requires #error to cause rejection of the program.

This issue suggests we do likewise.

CWG solicits EWG review of the proposed direction.

[erichkeane]

EWG discussed this in the February 6th, 2023 Afternoon session in Issaquah.

EWG agrees with the proposed resolution to CWG2518.

SF	F	N	A	SA
4	15	1	1	1

Result: Consensus

Additionally, this should be applied equally to failed static_assert.

SF	F	N	A	SA
2	13	2	1	1

Result: Consensus