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22c3839168
c.m4 contains a definition of _Noreturn which is modeled after
gnulib's lib/_Noreturn.h. The latter was recently
changed (b61bf2f0e8) to not using
[[noreturn]] at all, because the uses of _Noreturn in gnulib are
sometimes incompatible with the rules of [[noreturn]].
As a result glr.cc started to use _Noreturn in C++, which clang
refuses (all the glr.cc tests currently fail with Clang++).
* data/skeletons/c.m4 (b4_attribute_define): Restore the definition of
_Noreturn as [[noreturn]] in modern C++.
The generated code uses _Noreturn in places where [[noreturn]] is
valid.