[Bug libstdc++/124554] [16 Regression] with newlib, libstdc++ build fails with 'variable or field ‘longjmp’ declared void' since r16-8118-gc362a260ca2032

[ams at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124554

--- Comment #2 from Andrew Stubbs <ams at gcc dot gnu.org> ---
setjmp/longjmp is neither supported nor implemented for GCN.

The original reason being that the register file is very large, and of variable
size. (Max size is ~110 scalar + 256*64 VGPR + 256*64 AGPR registers, or a
little over 128kB.) There's no reason why it couldn't be implemented, in
theory, but we never needed to.

Anyway, setjmp not working is not a surprise.