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 17:27:21 -0800
From:	Darren Hart <dvhart@...ux.intel.com>
To:	David Sharp <dhsharp@...gle.com>
CC:	linux-kernel@...r.kernel.org, rostedt@...dmis.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 03:58 PM, David Sharp wrote:
> This reverts commit 6c696cec3f264a9399241b6e648f58bc97117d49.
>
> Make has default values CC and AR of 'cc' and 'ar' respectively. This means
> that "CC ?= anything" will never have effect, because CC is always already set.
> Because of this, 6c696cec makes setting CROSS_COMPILE from the command line or
> environment useless.

The problem with this approach is it prevents the user from setting CC 
explicitly with the environment which is a very common way of using a 
specific version of gcc (for example). It also places restrictions on 
the filename of the compiler (it must end in gcc - so gcc-4.5.1 cannot 
work), this isn't acceptable.

You could use CC=your-cross-compiler, and if that doesn't work for you, 
you could prepare a patch that conditionally sets CC only if 
CROSS_COMPILE is set, but please do not simply revert this patch which 
solved a real problem with the Makefile.

--
Darren

> Signed-off-by: David Sharp<dhsharp@...gle.com>
> Cc: Darren Hart<dvhart@...ux.intel.com>
> Cc: Steven Rostedt<rostedt@...dmis.org>
> ---
>   Makefile |    4 ++--
>   1 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/Makefile b/Makefile
> index 169fcbc..fa37df5 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -13,8 +13,8 @@ FILE_VERSION = 6
>
>   MAKEFLAGS += --no-print-directory
>
> -CC ?= $(CROSS_COMPILE)gcc
> -AR ?= $(CROSS_COMPILE)ar
> +CC = $(CROSS_COMPILE)gcc
> +AR = $(CROSS_COMPILE)ar
>   EXT = -std=gnu99
>   INSTALL = install
>


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