[Bug middle-end/111856] ICE with return type of typedef of void and `#pragma omp declare simd`

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111856

--- Comment #8 from Drea Pinski <pinskia at gcc dot gnu.org> ---
The main place to read up is the section on types. Basically a typedef of a
void becomes a variant of void_type_node so a direct comparison against
void_type_node no longer works so the easiest way to see if it is the type is a
void type is compare the TREE_CODE of the type to VOID_TYPE. This is what
VOID_TYPE_P does too.