[Bug c/96540] gcc fails to build on Darwin 19.6.0

[aldyh at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96540

--- Comment #4 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
Does this patch fix the problem?

https://gcc.gnu.org/pipermail/gcc-patches/2020-August/551660.html