Hi Alexei, Ok, I take that back. I see how it works now. Thanks for sharing that.
On Tue, Jan 26, 2016 at 10:18 PM, Joel Fernandes <agnel.j...@gmail.com> wrote: > Alexei, > > Thanks for the quick reply. > > But, the bpf sample programs like tracex1_kern.c are marked with > hostprogs-y in the Makefile as well, just like test_verifier.c. How > does Kbuild/Make know when to use gcc and when to use clang? > > Best, > > On Tue, Jan 26, 2016 at 10:08 PM, Alexei Starovoitov > <alexei.starovoi...@gmail.com> wrote: >> On Tue, Jan 26, 2016 at 09:51:54PM -0800, Joel Fernandes wrote: >>> Hi Brendan, Alexei, >>> >>> I noticed your patch fixing the $subject issue. >>> >>> https://patchwork.ozlabs.org/patch/471118/ >>> >>> However, I still see make samples/bpf/ using gcc instead of clang. >>> >>> Here's a verbose kbuild output of make samples/bpf/. My kernel version >>> is 4.4. It looks to me like Kbuild is ignoring the Makefile in >>> samples/bpf/. Let me know if you spot anything of the ordinary? >>> Thanks. >>> >>> make KBUILD_VERBOSE=1 samples/bpf/ >>> [..] >>> make KBUILD_MODULES=1 \ >>> -f /home/joel/data/repo/linux-4.4/scripts/Makefile.build obj=samples/bpf >>> (cat /dev/null; ) > samples/bpf/modules.order >>> gcc -Wp,-MD,samples/bpf/.test_verifier.o.d -Isamples/bpf -Wall >>> -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer >>> -std=gnu89 -I/home/joel/data/repo/linux-4.4/./usr/include >>> -I./usr/include -c -o samples/bpf/test_verifier.o >>> /home/joel/data/repo/linux-4.4/samples/bpf/test_verifier.c >>> /home/joel/data/repo/linux-4.4/samples/bpf/test_verifier.c:12:23: >>> fatal error: linux/bpf.h: No such file or directory >>> #include <linux/bpf.h> >>> ^ >>> compilation terminated. >> >> test_verifier.c should be built with gcc. >> *_kern.c are built with clang. >> In this case likely 'make headers_install' is missing. >>
