linux-kernel - Re: [PATCH trace-cmd 3/3] Revert "trace-cmd: Use conditional assignment of CC and AR"

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Date:	Wed, 09 Mar 2011 22:34:20 -0800
From:	Darren Hart <dvhart@...ux.intel.com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	David Sharp <dhsharp@...gle.com>, linux-kernel@...r.kernel.org,
	mrubin@...gle.com
Subject: Re: [PATCH trace-cmd 3/3] Revert "trace-cmd: Use conditional assignment
 of CC and AR"

On 03/09/2011 06:51 PM, Steven Rostedt wrote:
> On Wed, 2011-03-09 at 18:27 -0800, David Sharp wrote:
>> On Wed, Mar 9, 2011 at 5:58 PM, Darren Hart<dvhart@...ux.intel.com>  wrote:
>
>>> dvhart@...bt:templates$ cat Makefile
>>> ifdef CROSS_COMPILE
>>> CC = $(CROSS_COMPILE)gcc
>>> AR = $(CROSS_COMPILE)ar
>>> endif
>>>
>>> all:
>>>         echo "CC: $(CC)"
>>>
>>> dvhart@...bt:templates$ make -s
>>> CC: cc
>>>
>>> dvhart@...bt:templates$ CC=gcc-4.5.1 make -s
>>> CC: gcc-4.5.1
>>>
>>> dvhart@...bt:templates$ CROSS_COMPILE=my-cross- make -s
>>> CC: my-cross-gcc
>>>
>>>
>>> Seems to meet everyone's needs without changing any tools/scripts/etc that
>>> have used trace-cmd before or after the CC ?= wreckage.
>>
>> It's a little odd that the default CC is "cc" unless you supply
>> CROSS_COMPILE, then it's "gcc". I'd probably be okay with this, but I
>> would think it's weird.
>>
>> I don't know the answers, but if we take the kernel Makefile as a
>> template, then setting CC doesn't work.
>>
>
> I really don't care much for this either. But I'm trying to make it work
> for everyone. Honestly, I think the BUILD_CC version is the cleanest,
> but I understand that this will add a burden onto Darren to fix his
> tools to handle it, whereas, I would like to avoid that.

This is a very minor issue and will take me less time to fix than 
another half-dozen emails arguing for a different solution :-) However, 
being able to specify CC on the command line _is_ a very common thing, 
and preventing it from working will likely cause this to come up again 
in the future.

-- 
Darren Hart
Intel Open Source Technology Center
Yocto Project - Linux Kernel
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