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. >
