Re: [PATCH 5/5] scripts: imx: Do not include autoconf.h

From: Sascha Hauer <s.hauer@pengutronix.de>
To: "Marcin Niestrój" <m.niestroj@grinn-global.com>
Cc: barebox@lists.infradead.org
Subject: Re: [PATCH 5/5] scripts: imx: Do not include autoconf.h
Date: Fri, 7 Sep 2018 10:39:45 +0200	[thread overview]
Message-ID: <20180907083945.brzrswndrzdlx33w@pengutronix.de> (raw)
In-Reply-To: <8736upfvq1.fsf@grinn-global.com>

On Tue, Sep 04, 2018 at 11:38:46AM +0200, Marcin Niestrój wrote:
> Hi Sasha,
> 
> Sascha Hauer <s.hauer@pengutronix.de> writes:
> 
> > On Mon, Sep 03, 2018 at 12:57:15PM +0200, Marcin Niestroj wrote:
> >> All required defines are passed with command line -D options, so there
> >> is no need to include full autoconf.h header. Additionally there were
> >> compile time warnings printed when passed variables (CONFIG_HABV*) had
> >> embedded environment variables, because macros in autoconf.h were
> >> redefining these passed as command line arguments (-include is
> >> processed later than -D option).
> >> 
> >> Remove including autoconf.h header, so CONFIG_HABV* macros are only
> >> defined with command line arguments, properly expanding embedded
> >> variables.
> >> 
> >> Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com>
> >> ---
> >> Changes rfc -> v1: new patch
> >> 
> >>  scripts/Makefile.lib | 1 -
> >>  1 file changed, 1 deletion(-)
> >> 
> >> diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
> >> index 3b1308605..c254b5b79 100644
> >> --- a/scripts/Makefile.lib
> >> +++ b/scripts/Makefile.lib
> >> @@ -433,7 +433,6 @@ cmd_imximage_S_dcd=						\
> >>  
> >>  imxcfg_cpp_flags  = -Wp,-MD,$(depfile) -nostdinc -x assembler-with-cpp \
> >>        -I $(srctree)/include -I $(srctree)/arch/arm/mach-imx/include \
> >> -      -include include/generated/autoconf.h \
> >>        -DCONFIG_HABV3_SRK_PEM=\"$(CONFIG_HABV3_SRK_PEM)\" \
> >>        -DCONFIG_HABV3_CSF_CRT_DER=\"$(CONFIG_HABV3_CSF_CRT_DER)\" \
> >>        -DCONFIG_HABV3_IMG_CRT_DER=\"$(CONFIG_HABV3_IMG_CRT_DER)\" \
> >
> > the inclusion of autoconf.h is there so that we can use the CONFIG_*
> > macros. See for example rch/arm/boards/tqma53/flash-header.imxcfg:36
> >
> > #ifdef CONFIG_MACH_TQMA53_1GB_RAM
> 
> Okay, so we cannot drop autoconf.h inclusion. That also means that we
> need some other way to expand embedded variables in CONFIG_HAB* Kconfig
> options. The problem is that autoconf.h overwrites (redefines) all
> macros specified at command line.
> 
> >
> > What we can do instead is replace the -include with "-I
> > $(objtree)/include" so that we can do a "#include
> > <generated/autoconf.h>" in arch/arm/boards/tqma53/flash-header.imxcfg.
> > Would that be fine aswell?
> 
> This will also result in autoconf.h redefining macros specified at
> command line, but only for that board (because of explicit "include
> <generated/autoconf.h>"). Problem will surface once again when someone
> will start using HAB for that board.
> 
> Maybe we should expand all macros from autoconf.h? For example process
> autoconf.h *somehow* and produce autoconf-expanded.h, which we could use
> with "-include" option. This is just an idea, I do not know how to
> implement that. Any other ideas?

FYI I just posted another idea.

Sascha

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox