[Bug tree-optimization/72785] [7 Regression] kernel build error since r236831

[ktkachov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=72785

ktkachov at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|INVALID                     |---

--- Comment #24 from ktkachov at gcc dot gnu.org ---
I still see this when building an allmodconfig 4.9 Linux kernel for aarch64
(arm64 in kernel-speak).

Just do:
<Set CROSS_COMPILE to the aarch64 toolchain>
make ARCH=arm64 allmodconfig
make ARCH=arm64 -j<n>

Does anyone know of a kernel patch in flight to fix this in the kernel?
If not, should GCC work around this somehow? (perhaps by making jump-threading
less aggressive when __builtin_constant_p is involved?)