linux-kernel - Re: [RFC PATCH v7 23/37] perf tools: Introduce llvm config options

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Message-ID: <557BB4F9.6020008@plumgrid.com>
Date:	Fri, 12 Jun 2015 21:43:37 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	pi3orama <pi3orama@....com>
CC:	Wang Nan <wangnan0@...wei.com>,
	"acme@...nel.org" <acme@...nel.org>,
	"brendan.d.gregg@...il.com" <brendan.d.gregg@...il.com>,
	"daniel@...earbox.net" <daniel@...earbox.net>,
	"namhyung@...nel.org" <namhyung@...nel.org>,
	"masami.hiramatsu.pt@...achi.com" <masami.hiramatsu.pt@...achi.com>,
	"paulus@...ba.org" <paulus@...ba.org>,
	"a.p.zijlstra@...llo.nl" <a.p.zijlstra@...llo.nl>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"jolsa@...nel.org" <jolsa@...nel.org>,
	"dsahern@...il.com" <dsahern@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"lizefan@...wei.com" <lizefan@...wei.com>,
	"hekuang@...wei.com" <hekuang@...wei.com>,
	"xiakaixu@...wei.com" <xiakaixu@...wei.com>
Subject: Re: [RFC PATCH v7 23/37] perf tools: Introduce llvm config options

On 6/12/15 9:11 PM, pi3orama wrote:
>
>
> 发自我的 iPhone
>
>> 在 2015年6月13日，上午10:31，Alexei Starovoitov <ast@...mgrid.com> 写道：
>>
>>> On 6/11/15 10:35 PM, Wang Nan wrote:
>>>          # Path to clang. If omit, search it from $PATH.
>>>     clang-path = "/path/to/clang"
>>
>> I think this bit and search_program() from the next patch is
>> overly flexible. It's always delicate to search file paths.
>
> About this clang-path: in my environment the name of clang is x86_64-oe-linux-clang, and installed in /usr/bin/llvm-3.7, neither in $PATH nor has its default name. This is the default setting of yocto and open-embedded based systems. Please see do_install part in building script of it:
>
> https://github.com/openembedded/meta-oe/blob/master/meta-oe/recipes-core/llvm/llvm.inc

well, that setup installs host backend only due to:
--enable-targets=host-only
in the above script,
whereas typical clang install on ubuntu/fedora includes all backends.
So in your case you'd need to install another clang.
I agree that the name can be different than just 'clang',
so yeah 'clang-path' is needed for this reason.
So I'm ok keeping patches 23 and 24 as-is.

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