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Date:   Mon, 26 Mar 2018 20:02:30 -0700
From:   Alexei Starovoitov <alexei.starovoitov@gmail.com>
To:     "Du, Changbin" <changbin.du@intel.com>
Cc:     shuah@kernel.org, linux-kselftest@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        Daniel Borkmann <daniel@iogearbox.net>, netdev@vger.kernel.org
Subject: Re: [PATCH 4/4] selftests/bpf: fix compiling errors
Message-ID: <20180327030229.txifuth2qmnjo3hy@ast-mbp>
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On Tue, Mar 27, 2018 at 10:20:10AM +0800, Du, Changbin wrote:
> On Mon, Mar 26, 2018 at 07:55:13AM -0700, Alexei Starovoitov wrote:
> > On Mon, Mar 26, 2018 at 05:23:28PM +0800, changbin.du@intel.com wrote:
> > > Signed-off-by: Changbin Du <changbin.du@intel.com>
> > > ---
> > >  tools/testing/selftests/bpf/Makefile | 5 +++--
> > >  1 file changed, 3 insertions(+), 2 deletions(-)
> > > 
> > > diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
> > > index 5c43c18..dc0fdc8 100644
> > > --- a/tools/testing/selftests/bpf/Makefile
> > > +++ b/tools/testing/selftests/bpf/Makefile
> > > @@ -10,7 +10,8 @@ ifneq ($(wildcard $(GENHDR)),)
> > >    GENFLAGS := -DHAVE_GENHDR
> > >  endif
> > >  
> > > -CFLAGS += -Wall -O2 -I$(APIDIR) -I$(LIBDIR) -I$(GENDIR) $(GENFLAGS) -I../../../include
> > > +CFLAGS += -Wall -O2 -I$(APIDIR) -I$(LIBDIR) -I$(GENDIR) $(GENFLAGS) \
> > > +	  -I../../../include -I../../../../usr/include
> > >  LDLIBS += -lcap -lelf -lrt -lpthread
> > >  
> > >  # Order correspond to 'make run_tests' order
> > > @@ -62,7 +63,7 @@ else
> > >    CPU ?= generic
> > >  endif
> > >  
> > > -CLANG_FLAGS = -I. -I./include/uapi -I../../../include/uapi \
> > > +CLANG_FLAGS = -I. -I./include/uapi -I../../../include/uapi -I../../../../usr/include \
> > >  	      -Wno-compare-distinct-pointer-types
> > 
> > Nack.
> > I suspect that will break the build for everyone else who's doing it in the directory
> > itself instead of the outer one.
> >
> 
> This one? But I didn't see any problem.

because the build was lucky and additional path ../../../../usr/include didn't point
to a valid dir?
Please test with in-source and out-of-source builds.