d88319de41
There are some new requirements in C2x where GCC already behaves as
required (for all standard versions), where previous standard versions
either had weaker requirements permitting the GCC behavior, or were
arguably defective in what they said in that area. Add tests that
specifically verify GCC behaves as expected for C2x. (There may be
further such tests to be added in future for already-supported C2x
features.)
* Compound literals in function parameter lists have automatic storage
duration. (This is a case where strictly this wasn't specified by
previous standard versions, but it seems to make more sense to treat
this as a defect in those versions than to implement something
different conditionally for those versions.)
* Concatenation of string literals with different prefixes is a
constraint violation (previously it was implementation-defined
whether it was permitted, and GCC did not permit it).
* UCNs above 0x10ffff are a constraint violation; previously they were
implicitly undefined behavior by virtue of wording about "designates
the character" referring to code points outside the ISO/IEC 10646
range; GCC diagnosed such UCNs since commit
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