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

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Date:	Wed, 9 Mar 2011 21:25:17 -0800
From:	David Sharp <dhsharp@...gle.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Darren Hart <dvhart@...ux.intel.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, Mar 9, 2011 at 7:26 PM, Steven Rostedt <rostedt@...dmis.org> 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" ;)

Yes, except for very basic things.

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

This seems to do it all:

define allow-override
  $(if $(or $(findstring environment,$(origin $(1))),
            $(findstring command line,$(origin $(1)))),,\
    $(eval $(1) = $(2)))
endef

$(call allow-override,CC,$(CROSS_COMPILE)gcc)
$(call allow-override,AR,$(CROSS_COMPILE)ar)
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