• Michal Hocko's avatar
    samples/seccomp: do not compile when cross compiled · 6275ecbc
    Michal Hocko authored
    samples/seccomp relies on the host setting which is not suitable for
    crosscompilation and it actually fails when crosscompiling s390 and
    powerpc all{yes,mod}config on x86_64 with
    samples/seccomp/bpf-helper.h:135:2: error: #error __BITS_PER_LONG value unusable.
     #error __BITS_PER_LONG value unusable.
    In file included from samples/seccomp/bpf-fancy.c:13:0:
    samples/seccomp/bpf-fancy.c: In function ‘main’:
    samples/seccomp/bpf-fancy.c:38:11: error: ‘__NR_exit’ undeclared (first use in this function)
       SYSCALL(__NR_exit, ALLOW),
    and many others. I am doing these for compile testing and it's been
    quite useful to catch issues. Crosscompiling sample code on the other
    hand doesn't seem all that important so it seems like the easiest way to
    simply disable samples/seccomp when crosscompiling.
    Fixing this properly is not that easy as Kees explains:
    : IIRC, one of the problems is with build ordering problems: the kernel
    : headers used by the samples aren't available when cross compiling.
    Signed-off-by: default avatarMichal Hocko <mhocko@suse.com>
    Signed-off-by: default avatarKees Cook <keescook@chromium.org>
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