Should we require GNU make in binutils?

[Fangrui Song]

On Thu, Aug 24, 2023 at 8:23 PM Alan Modra via Binutils
<binutils@sourceware.org> wrote:
>
> I see the toplevel Makefile.in makes use of $(filter-out ..) and other
> GNU Make extensions, and requires GNU Make 3.80 or later when building
> gcc.  gdb also uses GNU make extensions.  It seems silly to me that
> binutils is still trying to avoid GNU make extensions.
>
> We could start with the following (originally from Hans-Peter) which
> avoids a whole lot of entering/leaving messages when building with
> --enable-targets=all.  What do people think?

This is a good idea!