[U-Boot] [PATCH] Makefile: Ensure we build with -std=gnu11

[Tom Rini <trini@konsulko.com>]

On Wed, Jun 20, 2018 at 07:28:15AM +0000, Joakim Tjernlund wrote:

> On Tue, 2018-06-19 at 23:57 -0400, Tom Rini wrote:
> > 
> > 
> > With the move to using at least gcc-6 for many targets we now have C
> > code that requires the GNU11 C standard to be used in all cases.
> 
> Requiring gcc-6 is a bit much I think, there are lots of cross gcc's out there
> that is older. I don't think even the kernel needs gcc-6

We've required gcc-6 for ARM since v2018.01, and we were warning about
that for a while longer than that, due to toolchain issues.

That said, my commit message is clearly not clear enough.  We don't
require gcc-6 for everyone, we require support for -std=gnu11, and that
goes back a long ways.  It's just that since some platforms require
gcc-6 we've started having (and this is good, the code is cleaner!) some
C-11'isms sneak into the code.  For example, sandbox now fails to
compile on older hosts due to a for (int i = 0; ...) in cmd/iotrace.c

-- 
Tom
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