[dpdk-dev] BUG BPF examples broken

[dpdk-dev] BUG BPF examples broken

[Stephen Hemminger]

The BPF examples do not compile on Debian.

The issue is that ret_mbuf_core.h includes rte_atomic which include rte_common
which pulls in errno.h and bits/errno.h. And then asm/errno.h

/usr/include/linux/errno.h:1:10: fatal error: 'asm/errno.h' file not found
#include <asm/errno.h>
         ^~~~~~~~~~~~~
1 error generated.

asm/errno.h is architecture specific and BPF is an architecture.

Re: [dpdk-dev] BUG BPF examples broken

[Ananyev, Konstantin]

> -----Original Message-----
> From: Stephen Hemminger <stephen@networkplumber.org>
> Sent: Saturday, February 8, 2020 4:05 AM
> To: Ananyev, Konstantin <konstantin.ananyev@intel.com>
> Cc: dev@dpdk.org
> Subject: BUG BPF examples broken
> 
> The BPF examples do not compile on Debian.
> 
> The issue is that ret_mbuf_core.h includes rte_atomic which include rte_common
> which pulls in errno.h and bits/errno.h. And then asm/errno.h
> 
> /usr/include/linux/errno.h:1:10: fatal error: 'asm/errno.h' file not found
> #include <asm/errno.h>
>          ^~~~~~~~~~~~~
> 1 error generated.
> 
> asm/errno.h is architecture specific and BPF is an architecture.

AFAIK, installing gcc-multilib package will generate a symlink for /usr/include/asm:
On my ubuntu box:
ls -ld /usr/include/asm
lrwxrwxrwx 1 root root 20 May 20  2019 /usr/include/asm -> x86_64-linux-gnu/asm

As another possible way: -I/usr/include/x86_64-linux-gnu manually.
clang -O2 -U __GNUC__ -I/usr/include/x86_64-linux-gnu -I${RTE_SDK}/${RTE_TARGET}/include -target bpf -Wno-int-to-void-pointer-cast -c t3.c