linux-kernel - [PATCH] libbpf: Define _

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Message-ID: <20200609153445.GF24868@kernel.org>
Date:   Tue, 9 Jun 2020 12:34:45 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Ian Rogers <irogers@...gle.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Pekka Enberg <penberg@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>,
        Irina Tirdea <irina.tirdea@...el.com>,
        bpf <bpf@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH] libbpf: Define __WORDSIZE if not available

Some systems, such as Android, don't have a define for __WORDSIZE, do it
in terms of __SIZEOF_LONG__, as done in perf since 2012:

  http://git.kernel.org/torvalds/c/3f34f6c0233ae055b5

For reference: https://gcc.gnu.org/onlinedocs/cpp/Common-Predefined-Macros.html

I build tested it here and Andrii did some Travis CI build tests too.

Acked-by: Andrii Nakryiko <andriin@...com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>