Jesper Dangaard Brouer fb01b49ec0 configure: add detection for missing header files for errno.h ...

It is fairly natural to include <errno.h> in BPF programs as some
helpers and hooks use these errno defines (like lsm-nobpf/).  Again we
discover that when compiling with clang option[1] "-target bpf" the OS
distros header files gets confused as __x86_64__ isn't define by clang
which in this case (on Fedora) cause include <gnu/stubs-32.h>.

The error looks like this:

$ make
    CLANG    lsm-nobpf-kern.o
In file included from lsm-nobpf-kern.c:6:
In file included from /usr/include/errno.h:25:
In file included from /usr/include/features.h:474:
/usr/include/gnu/stubs.h:7:11: fatal error: 'gnu/stubs-32.h' file not found
# include <gnu/stubs-32.h>
          ^~~~~~~~~~~~~~~~

This patch adds a compile test to configure script to help people
realize why compiling is failing on their systems.

[1] https://www.kernel.org/doc/html/latest/bpf/bpf_devel_QA.html#q-clang-flag-for-target-bpf

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>

2021-02-09 16:28:45 +01:00

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