From: Jiri Olsa <jolsa@redhat.com>
To: Seth Forshee <seth.forshee@canonical.com>
Cc: Jiri Olsa <jolsa@kernel.org>, Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
netdev@vger.kernel.org, bpf@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: resolve_btfids breaks kernel cross-compilation
Date: Thu, 17 Sep 2020 10:04:52 +0200 [thread overview]
Message-ID: <20200917080452.GB2411168@krava> (raw)
In-Reply-To: <20200916194733.GA4820@ubuntu-x1>
On Wed, Sep 16, 2020 at 02:47:33PM -0500, Seth Forshee wrote:
> The requirement to build resolve_btfids whenever CONFIG_DEBUG_INFO_BTF
> is enabled breaks some cross builds. For example, when building a 64-bit
> powerpc kernel on amd64 I get:
>
> Auto-detecting system features:
> ... libelf: [ [32mon[m ]
> ... zlib: [ [32mon[m ]
> ... bpf: [ [31mOFF[m ]
>
> BPF API too old
> make[6]: *** [Makefile:295: bpfdep] Error 1
>
> The contents of tools/bpf/resolve_btfids/feature/test-bpf.make.output:
>
> In file included from /home/sforshee/src/u-k/unstable/tools/arch/powerpc/include/uapi/asm/bitsperlong.h:11,
> from /usr/include/asm-generic/int-ll64.h:12,
> from /usr/include/asm-generic/types.h:7,
> from /usr/include/x86_64-linux-gnu/asm/types.h:1,
> from /home/sforshee/src/u-k/unstable/tools/include/linux/types.h:10,
> from /home/sforshee/src/u-k/unstable/tools/include/uapi/linux/bpf.h:11,
> from test-bpf.c:3:
> /home/sforshee/src/u-k/unstable/tools/include/asm-generic/bitsperlong.h:14:2: error: #error Inconsistent word size. Check asm/bitsperlong.h
> 14 | #error Inconsistent word size. Check asm/bitsperlong.h
> | ^~~~~
>
> This is because tools/arch/powerpc/include/uapi/asm/bitsperlong.h sets
> __BITS_PER_LONG based on the predefinied compiler macro __powerpc64__,
> which is not defined by the host compiler. What can we do to get cross
> builds working again?
could you please share the command line and setup?
thanks,
jirka
next prev parent reply other threads:[~2020-09-17 8:22 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-16 19:47 resolve_btfids breaks kernel cross-compilation Seth Forshee
2020-09-17 8:04 ` Jiri Olsa [this message]
2020-09-17 8:38 ` Jiri Olsa
2020-09-17 9:14 ` Jiri Olsa
2020-09-17 9:54 ` Jiri Olsa
2020-09-17 12:54 ` Seth Forshee
2020-09-18 10:05 ` Jiri Olsa
2020-09-18 18:50 ` Andrii Nakryiko
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