linux-kernel - Re: [PATCH 1/2] perf test: Add libbpf relocation checker

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Date:	Fri, 22 Jan 2016 09:07:50 -0800
From:	Alexei Starovoitov <alexei.starovoitov@...il.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Wang Nan <wangnan0@...wei.com>, ast@...nel.org,
	linux-kernel@...r.kernel.org,
	Daniel Borkmann <daniel@...earbox.net>,
	Li Zefan <lizefan@...wei.com>, pi3orama@....com
Subject: Re: [PATCH 1/2] perf test: Add libbpf relocation checker

On Fri, Jan 22, 2016 at 12:40:50PM -0300, Arnaldo Carvalho de Melo wrote:
> [root@...et ~]# llc --version
> LLVM (http://llvm.org/):
>   LLVM version 3.7.0
>   Optimized build.
>   Built Dec  4 2015 (15:49:18).
>   Default target: x86_64-redhat-linux-gnu
>   Host CPU: broadwell
> 
>   Registered Targets:
>     aarch64    - AArch64 (little endian)
>     aarch64_be - AArch64 (big endian)
>     amdgcn     - AMD GCN GPUs
>     arm        - ARM
>     arm64      - ARM64 (little endian)
>     armeb      - ARM (big endian)
>     cpp        - C++ backend
>     nvptx      - NVIDIA PTX 32-bit
>     nvptx64    - NVIDIA PTX 64-bit
>     ppc32      - PowerPC 32
>     ppc64      - PowerPC 64
>     ppc64le    - PowerPC 64 LE
>     r600       - AMD GPUs HD2XXX-HD6XXX
>     systemz    - SystemZ
>     thumb      - Thumb
>     thumbeb    - Thumb (big endian)
>     x86        - 32-bit X86: Pentium-Pro and above
>     x86-64     - 64-bit X86: EM64T and AMD64
> [root@...et ~]# 

ouch, so fedorra enabled all sorts of backends, but disabled BPF?!
Can somebody talk to redhat packaging folks?
clang/llvm enables BPF backend by default.