On Wed, Jun 05, 2019 at 04:47:22PM -0700, Jakub Kicinski wrote:
> It seems like periodically someone posts patches to "fix"
> header includes. The issue is that samples expect the
> include path to have the uAPI headers (from usr/) first,
> and then tools/ headers, so that locally installed uAPI
> headers take precedence. This means that if users didn't
> run headers_install they will see all sort of strange
> compilation errors, e.g.:
>
> HOSTCC samples/bpf/test_lru_dist
> samples/bpf/test_lru_dist.c:39:8: error: redefinition of ‘struct list_head’
> struct list_head {
> ^~~~~~~~~
> In file included from samples/bpf/test_lru_dist.c:9:0:
> ../tools/include/linux/types.h:69:8: note: originally defined here
> struct list_head {
> ^~~~~~~~~
>
> Try to detect this situation, and print a helpful warning.
Acked-by: Martin KaFai Lau <kafai@xxxxxx>
