From mboxrd@z Thu Jan  1 00:00:00 1970
From: Thomas Monjalon <thomas.monjalon-pdR9zngts4EAvxtiuMwx3w@public.gmane.org>
Subject: Re: [PATCH] mk: Rework gcc version detection to permit
	versions newer than 4.x
Date: Fri, 20 Feb 2015 15:04:56 +0100
Message-ID: <2614307.fg5h8BUtrJ@xps13>
References: <7a06a1e8019a40d4175c6bc2e1d7e62cf956b291.1424261465.git.pmatilai@redhat.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7Bit
Cc: dev-VfR2kkLFssw@public.gmane.org
To: Panu Matilainen <pmatilai-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Return-path: <dev-bounces-VfR2kkLFssw@public.gmane.org>
In-Reply-To: <7a06a1e8019a40d4175c6bc2e1d7e62cf956b291.1424261465.git.pmatilai-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
List-Id: patches and discussions about DPDK <dev.dpdk.org>
List-Unsubscribe: <http://dpdk.org/ml/options/dev>,
 <mailto:dev-request-VfR2kkLFssw@public.gmane.org?subject=unsubscribe>
List-Archive: <http://dpdk.org/ml/archives/dev/>
List-Post: <mailto:dev-VfR2kkLFssw@public.gmane.org>
List-Help: <mailto:dev-request-VfR2kkLFssw@public.gmane.org?subject=help>
List-Subscribe: <http://dpdk.org/ml/listinfo/dev>,
 <mailto:dev-request-VfR2kkLFssw@public.gmane.org?subject=subscribe>
Errors-To: dev-bounces-VfR2kkLFssw@public.gmane.org
Sender: "dev" <dev-bounces-VfR2kkLFssw@public.gmane.org>

Hi Panu,

2015-02-18 14:11, Panu Matilainen:
> Separately comparing major and minor versions becomes seriously clumsy
> when with major version changes, convert the entire version string into
> a numeric value (ie 4.6.0 becomes 460 and 5.0.0 becomes 500) and use
> that for comparisons. This simplifies the comparisons and makes
> gcc 5.0 naturally recognized at least as capable as newest 4.x.
> 
> This three-digit scheme would run into trouble if gcc ever went to
> two-digit version segments, but that hasn't happened in the last 10+
> years so it seems like a safe assumption.
> 
> Signed-off-by: Panu Matilainen <pmatilai-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>

Yes this version checking was totally buggy.
Thanks for improving it.

I have a comment about the conversion of old versions checks.

> -ifneq ($(shell test $(GCC_MAJOR_VERSION) -le 4 -a $(GCC_MINOR_VERSION) -le 3 && echo 1), 1)
> +ifneq ($(shell test $(GCC_VERSION) -le 430 && echo 1), 1)

The previous check was a buggy "if not <= 4.3.x"
Your check is "if not <= 4.3.0"
So it's a bit different.
And I think we should remove negation to make it simpler:
	"if >= 4.4.0"

I have the same comment for other changes in the patch.