From: Seth Forshee <seth.forshee@canonical.com>
To: Jiri Olsa <jolsa@kernel.org>
Cc: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
netdev@vger.kernel.org, bpf@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: resolve_btfids breaks kernel cross-compilation
Date: Wed, 16 Sep 2020 14:47:33 -0500 [thread overview]
Message-ID: <20200916194733.GA4820@ubuntu-x1> (raw)
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?
Thanks,
Seth
next reply other threads:[~2020-09-16 19:51 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-16 19:47 Seth Forshee [this message]
2020-09-17 8:04 ` resolve_btfids breaks kernel cross-compilation Jiri Olsa
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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