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

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Date:	Sat, 13 Jun 2015 12:11:42 +0800
From:	pi3orama <pi3orama@....com>
To:	Alexei Starovoitov <ast@...mgrid.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



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

Therefore, I think something like this option should not be dropped, or people like me have to do some nasty work to make it useable. Could you please rethink it?

Thank you.

> Unless this is really needed, I would drop this bit.
> popen() in the next patch executes clang via shell,
> so explicit PATH search in unnecessary.
> 
> The rest of the patches look good to me.
> Thanks again.
> 

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