Cheng Shao authored Nov 03, 2021 and Marge Bot committed Dec 15, 2021

We used to attempt compiling `foo_t val; *val;` to determine if `foo_t`
is a pointer type in C. This doesn't work if `foo_t` points to an
incomplete type, and autoconf will detect `foo_t` as a floating point
type in that case. Now we use `memset(val, 0, 0)` instead, and it works
for incomplete types as well.