[U-Boot] [PATCH v2] Makefile: adopt --std=gnu11 for HOSTCFLAGS on Linux

[Tom Rini]

On Mon, May 14, 2018 at 04:53:49PM +0200, Mark Kettenis wrote:
> > From: Philipp Tomsich <philipp.tomsich at theobroma-systems.com>
> > Date: Mon, 14 May 2018 15:22:06 +0200
> > 
> > Following the conversion of the SPDX license tags, a number of files
> > compiled with -pedantic now generate warnings similar to the following
> > for using C99-style '//' comments in ISO C90 code:
> > 
> >   tools/gen_eth_addr.c:1:1: warning: C++ style comments are not allowed in ISO C90
> >    // SPDX-License-Identifier: GPL-2.0+
> >    ^
> > 
> > The SPDX comment-style change means that these files have adopted C99,
> > so need to change the language-standard to --std=gnu99 or --std=gnu11
> > to let the compiler know this.
> > 
> > As we now require GCC 6 or newer for the cross-compiler, the project has
> > implicitly moved the project to GNU11: let older GCC versions on various
> > Linux distros know to treat our host tools as GNU11 as well.
> 
> Note that the requirement is on the cross-compiler, not the host
> compiler.  On our "primary" architectures OpenBSD 6.3 ships with Clang
> 5.0.1 and the current development version uses Clang 6.0.0, which
> default to --std=gnu11.  I do hope those will continue to be supported
> as the host compiler...

Does Clang 5.0.1 support gnu11 ?  Note that at this point we're not even
talking about moving to GNU11 features being used anywhere, just
enforcing consistency between modern (post gcc-5) and old (gcc-4.x)
compilers all in order to not have // style comments be a warning (which
in turn is a C99/gnu99 thing).  Thanks!

-- 
Tom
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