[Bug c++/90569] __STDCPP_DEFAULT_NEW_ALIGNMENT__ is wrong for i386-pc-solaris2.11

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90569

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Rainer, the change to gcc/cp/init.c would allow you to do:

#define MALLOC_ABI_ALIGNMENT 8

in gcc/config/i386/sol2.h and that would cause std::allocator to know that it
can't rely on malloc for 16-byte alignment.

Although that would only help for C++17, because otherwise __cpp_aligned_new
isn't defined ... drat.

It's better than nothing though.

Does that seem acceptable for your target?