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selftests/bpf: Fix compiling tcp_rtt.c with musl-libc

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The GNU version of 'struct tcp_info' in 'netinet/tcp.h' is not exposed by
musl headers unless _GNU_SOURCE is defined.

Add this definition to fix errors seen compiling for mips64el/musl-libc:

  tcp_rtt.c: In function 'wait_for_ack':
  tcp_rtt.c:24:25: error: storage size of 'info' isn't known
     24 |         struct tcp_info info;
        |                         ^~~~
  tcp_rtt.c:24:25: error: unused variable 'info' [-Werror=unused-variable]
  cc1: all warnings being treated as errors

Fixes: 1f4f80fed2 ("selftests/bpf: test_progs: convert test_tcp_rtt")
Signed-off-by: Tony Ambardar <tony.ambardar@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/f2329767b15df206f08a5776d35a47c37da855ae.1721713597.git.tony.ambardar@gmail.com
This commit is contained in:
Tony Ambardar 2024-07-22 22:54:41 -07:00 committed by Andrii Nakryiko
parent 5e4c43bcb8
commit 18826fb0b7
1 changed files with 1 additions and 0 deletions
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tools/testing/selftests/bpf/prog_tests/tcp_rtt.c
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@ -1,4 +1,5 @@
// SPDX-License-Identifier: GPL-2.0
#define _GNU_SOURCE
#include <test_progs.h>
#include "cgroup_helpers.h"
#include "network_helpers.h"