[PATCH 13/23] scripts: imx: move macro definitions to common header file

[Sam Ravnborg]

On Mon, Feb 01, 2016 at 10:18:10AM +0100, Sascha Hauer wrote:
> On Fri, Jan 29, 2016 at 07:04:38PM +0100, Sam Ravnborg wrote:
> > On Fri, Jan 29, 2016 at 11:43:53AM +0100, Sascha Hauer wrote:
> > > ARRAY_SIZE and offsetof are used by both imx-usb-loader and imx-image.
> > > Move their definitions to the common header file.
> > > 
> > > Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
> > > ---
> > >  scripts/imx/imx-image.c      | 2 --
> > >  scripts/imx/imx-usb-loader.c | 5 -----
> > >  scripts/imx/imx.h            | 5 +++++
> > >  3 files changed, 5 insertions(+), 7 deletions(-)
> > > 
> > > diff --git a/scripts/imx/imx.h b/scripts/imx/imx.h
> > > index e986545..1d23e11 100644
> > > --- a/scripts/imx/imx.h
> > > +++ b/scripts/imx/imx.h
> > > @@ -1,3 +1,8 @@
> > > +#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
> > This macro is already defined in include/linux/kernel.h,
> > so it would be better to use this version.
> 
> It's defined in the barebox version of this file, but not in
> /usr/include/linux/kernel.h which would be used for compiling programs
> for the host. Adding a -I$(srctree)/include to the host compiler options
> is also something we don't want.
I my short review I did not realize this was used by host code.

> What other options do we have to avoid duplicating these over and over
> again? Maybe adding a scripts/include directory which contains such
> useful defines? I just found tools/include in the Linux Kernel which
> already has a collection of such defines. Maybe this is a good starting
> point.
In the kernel we have /usr/include which contains exported (ABI) headers,
and tools/include for diverse host tools.
IMO tools/include would be a nice place to add ARRAY_SIZE and similar
stuff that can be shared between host tools.
And then locate all non-trivial host related tools in tools/xxx.

The build infrastructure should be updated so the headers are picked
up without adding any -I flags.

	Sam