From mboxrd@z Thu Jan  1 00:00:00 1970
From: =?UTF-8?Q?Andreas_Bie=c3=9fmann?= <andreas.devel@googlemail.com>
Date: Thu, 27 Aug 2015 11:01:19 +0200
Subject: [U-Boot] [RFC PATCH] Makefile: search for GNU date
In-Reply-To: <201508271028.47523.marex@denx.de>
References: <55DC2C19.1000809@gmail.com>
 <1440663230-4715-1-git-send-email-andreas.devel@googlemail.com>
 <201508271028.47523.marex@denx.de>
Message-ID: <55DED1DF.4010600@gmail.com>
List-Id: <u-boot.lists.denx.de>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
To: u-boot@lists.denx.de

Hi Marek,

On 08/27/2015 10:28 AM, Marek Vasut wrote:
> On Thursday, August 27, 2015 at 10:13:49 AM, Andreas Bie?mann wrote:
>> The SOURCE_DATE_EPOCH mechanism for reproducible builds requires the GNU
>> variant of date.
> 
> Why does it require the GNU date ?

Cause of the -d switch. It is used in GNU date variants to set the time
to print the string from. On the other hand *BSD variants use it to set
the DST flag.

>> Respect this and search it, error on missing GNU date.
> 
> Wouldn't it make more sense to fix the code to NOT depend on GNU extensions ?

That would be great, but so we need to check for the tool and use the
right switches depending on that.
I think forcing the user to provide the right tool here is Ok.

Best regards

Andreas