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 22:41:24 -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 07:26 PM, Steven Rostedt wrote:
> On Wed, 2011-03-09 at 21:51 -0500, Steven Rostedt wrote:
>
>> I'll play with some other make tricks and see if I can come up with a
>> better solution.
>
> OK, it didn't take me long to come up with "Makefiles suck" ;)

Yeah, that little tidbit I sent took longer to come up with than it 
should have :/

>
> But I did come up with a solution:
>
> ifneq ("$(origin CC)", "environment")
> CC = gcc
> endif
>
> CC := $(CROSS_COMPILE)$(CC)

Why do we want to force CC=gcc? Isn't the right thing to make your OS 
setup cc to point to your preferred compiler since it is known to be the 
default for make?

On Ubuntu, cc -> gcc
On Fedora 13, cc -> ccache

seems strange to force it to be gcc when users/distros have gone through 
the trouble to set it up on their system.


> This wont let make CC=xx work unless I also add a:
>
> ifneq ("$(origin CC)", "command line")
>
> around the above if, but do we care?
>

This starts to get to the point where others looking at it will choke on 
the expert Makefile usage.

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