linux-kernel - Re: [PATCH] bpfilter: remove extra header search paths for bpfilter

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Date:   Thu, 21 Feb 2019 10:05:43 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Networking <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] bpfilter: remove extra header search paths for
 bpfilter_umh

On Fri, Feb 22, 2019 at 12:54:47AM +0900, Masahiro Yamada wrote:
> On Thu, Feb 21, 2019 at 11:46 PM Guenter Roeck <linux@...ck-us.net> wrote:
> >
> > On Thu, Jan 31, 2019 at 12:15:35PM +0900, Masahiro Yamada wrote:
> > > Currently, the header search paths -Itools/include and
> > > -Itools/include/uapi are not used. Let's drop the unused code.
> > >
> > > We can remove -I. too by fixing up one C file.
> > >
> >
> > This patch reintroduces the problem last fixed with commit ae40832e53c3
> > ("bpfilter: fix a build err"). Seen (at least) with gcc 7.4.0, 8.2.0.
> > binutils version is 2.31.1. Reverting this patch fixes the problem.
> 
> 
> Hmm. I cannot reproduce the build error with my gcc,
> but you are right.
> 
Maybe it has less to do with the gcc version and more with how the
toolchain is built. I see the problem with toolchains generated
using buildroot.

> 
> I'd like to get back only
> 'KBUILD_HOSTCFLAGS += -Itools/include/ -Itools/include/uapi'
> instead of the full revert.
> 

That doesn't work for me. I need

KBUILD_HOSTCFLAGS += -I. -Itools/include/uapi

Just don't ask me why.

Guenter
 
> If David is fine with it, I can send a patch with filling commit log.
> 
> 
> 
> Thanks.
> 
> 
> 
> > Guenter
> >
> > > Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
> > > Signed-off-by: David S. Miller <davem@...emloft.net>
> > > ---
> > >  net/bpfilter/Makefile | 1 -
> > >  net/bpfilter/main.c   | 2 +-
> > >  2 files changed, 1 insertion(+), 2 deletions(-)
> > >
> > > diff --git a/net/bpfilter/Makefile b/net/bpfilter/Makefile
> > > index 0947ee7f70d5..5d6c7760142d 100644
> > > --- a/net/bpfilter/Makefile
> > > +++ b/net/bpfilter/Makefile
> > > @@ -5,7 +5,6 @@
> > >
> > >  hostprogs-y := bpfilter_umh
> > >  bpfilter_umh-objs := main.o
> > > -KBUILD_HOSTCFLAGS += -I. -Itools/include/ -Itools/include/uapi
> > >  HOSTCC := $(CC)
> > >
> > >  ifeq ($(CONFIG_BPFILTER_UMH), y)
> > > diff --git a/net/bpfilter/main.c b/net/bpfilter/main.c
> > > index 1317f108df8a..61ce8454a88e 100644
> > > --- a/net/bpfilter/main.c
> > > +++ b/net/bpfilter/main.c
> > > @@ -6,7 +6,7 @@
> > >  #include <sys/socket.h>
> > >  #include <fcntl.h>
> > >  #include <unistd.h>
> > > -#include "include/uapi/linux/bpf.h"
> > > +#include "../../include/uapi/linux/bpf.h"
> > >  #include <asm/unistd.h>
> > >  #include "msgfmt.h"
> > >
> > > --
> > > 2.7.4
> 
> 
> 
> --
> Best Regards
> 
> Masahiro Yamada