[Bug target/96377] [10/11 Regression] GCC 10.2/11 doesn't build Linux kernel anymore

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96377

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I think the problem is that c_common_type does:
742       if (TYPE_ATTRIBUTES (t1) != NULL_TREE)
743         t1 = build_type_attribute_variant (t1, NULL_TREE);
744     
745       if (TYPE_ATTRIBUTES (t2) != NULL_TREE)
746         t2 = build_type_attribute_variant (t2, NULL_TREE);
which strips off the "Advanced SIMD type" attribute from both of the types.
C++ FE doesn't do anything like that.