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

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Date:	Thu, 10 Mar 2011 08:07:43 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Darren Hart <dvhart@...ux.intel.com>
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 Wed, 2011-03-09 at 22:41 -0800, Darren Hart wrote:
> 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?

Why not? The kernel does it. And yes, as I am following the kernel with
trace-cmd than other user space tools.

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

Ug, thanks for telling me. /me goes to disable ccache from his F13
installs.

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

If you define CC as a environment variable, it will work with the other
solution.

> 
> 
> > 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.
> 

Yeah, that took a bit of searching. Makefiles are far from being
obvious. But as you all know, I work in the world of obfuscation.
Probably why I prefer perl over python ;)

-- Steve


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