Re: [PATCH bpf] bpftool: fix compilation failure for net.o with older glibc

Hello:

This patch was applied to bpf/bpf.git (refs/heads/master):

On Wed,  6 Jan 2021 15:59:06 +0000 you wrote:

For older glibc ~2.17, #include'ing both linux/if.h and net/if.h
fails due to complaints about redefinition of interface flags:

  CC       net.o
In file included from net.c:13:0:
/usr/include/linux/if.h:71:2: error: redeclaration of enumerator ‘IFF_UP’
  IFF_UP    = 1<<0,  /* sysfs */
  ^
/usr/include/net/if.h:44:5: note: previous definition of ‘IFF_UP’ was here
     IFF_UP = 0x1,  /* Interface is up.  */

[...]

Here is the summary with links:
  - [bpf] bpftool: fix compilation failure for net.o with older glibc
    https://git.kernel.org/bpf/bpf/c/6f02b540d759

You are awesome, thank you!
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