Re: [PATCH] Don't include config.h for native helpers

[Baruch Siach <baruch@xxxxxxxxxx>]

Hi Rink,

On Wed, May 23, 2018 at 08:20:03AM +0200, Rink Springer wrote:
> On Tue, May 22, 2018 at 06:57:07PM +0300, Baruch Siach wrote:
> > From: Peter Korsgaard <peter@xxxxxxxxxxxxx>
> > 
> > config.h contains settings for the cross compiler (most importantly
> > 32/64bit versions of functions), so don't include it when calling the
> > native compiler to build the helpers.
> > 
> > Otherwise we get build errors like:
> > 
> > /usr/bin/gcc -include ../config.h -DBSD=1 -DSHELL -DIFS_BROKEN  -g -O2 -Wall    -o mkinit mkinit.c
> > In file included from /usr/include/sys/stat.h:107,
> >                  from /usr/include/fcntl.h:38,
> >                  from mkinit.c:50:
> > /usr/include/bits/stat.h:117: error: redefinition of ‘struct stat’
> > In file included from /usr/include/fcntl.h:38,
> >                  from mkinit.c:50:
> > /usr/include/sys/stat.h:504: error: redefinition of ‘stat’
> > /usr/include/sys/stat.h:455: note: previous definition of ‘stat’ was here
> > 
> > Signed-off-by: Peter Korsgaard <peter@xxxxxxxxxxxxx>
> > [baruch: apply to Makefile.am; update Peter's email address]
> > Signed-off-by: Baruch Siach <baruch@xxxxxxxxxx>
> > ---
> >  src/Makefile.am | 3 +--
> >  1 file changed, 1 insertion(+), 2 deletions(-)
> > 
> > diff --git a/src/Makefile.am b/src/Makefile.am
> > index 139355e5b7e9..55780f4689da 100644
> > --- a/src/Makefile.am
> > +++ b/src/Makefile.am
> > @@ -2,12 +2,11 @@ AM_YFLAGS = -d
> >  
> >  COMMON_CFLAGS = -Wall
> >  COMMON_CPPFLAGS = \
> > -	-include $(top_builddir)/config.h \
> >  	-DBSD=1 -DSHELL \
> >  	-DIFS_BROKEN
> >  
> >  AM_CFLAGS = $(COMMON_CFLAGS)
> > -AM_CPPFLAGS = $(COMMON_CPPFLAGS)
> > +AM_CPPFLAGS = -include $(top_builddir)/config.h $(COMMON_CPPFLAGS)
> >  AM_CFLAGS_FOR_BUILD = -g -O2 $(COMMON_CFLAGS) 
> >  AM_CPPFLAGS_FOR_BUILD = $(COMMON_CPPFLAGS)
> 
> I seem to recall that I encountered the same problem when cross-building
> dash; however, I fixed it in a different way:
> 
> diff --git a/src/Makefile.am b/src/Makefile.am
> index 139355e..ed18844 100644
> --- a/src/Makefile.am
> +++ b/src/Makefile.am
> @@ -12,7 +12,7 @@ AM_CFLAGS_FOR_BUILD = -g -O2 $(COMMON_CFLAGS)
>  AM_CPPFLAGS_FOR_BUILD = $(COMMON_CPPFLAGS)
> 
>  COMPILE_FOR_BUILD = \
> -       $(CC_FOR_BUILD) $(DEFAULT_INCLUDES) $(AM_CPPFLAGS_FOR_BUILD) \
> +       $(CC_FOR_BUILD) $(DEFAULT_INCLUDES) \
>         $(CPPFLAGS_FOR_BUILD) \
>         $(AM_CFLAGS_FOR_BUILD) $(CFLAGS_FOR_BUILD)
> 
> I am unsure what is the best solution here.

This removes the only reference to AM_CPPFLAGS_FOR_BUILD, so you can remove it 
entirely. Also, the intermediate COMMON_CPPFLAGS would only used once to 
initialize AM_CPPFLAGS, so you can remove that one as well.

baruch

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