[U-Boot] [U-Boot, v3] Makefile: fix SOURCE_DATE_EPOCH for *BSD host

[Tom Rini]

On Fri, Aug 28, 2015 at 10:29:55AM +0200, Andreas Bießmann wrote:

> The SOURCE_DATE_EPOCH mechanism for reproducible builds require some date(1)
> with -d switch to print the relevant date and time strings of another point of
> time.
> 
> In other words it requires some date(1) that behaves like the GNU date(1) [1].
> The BSD date(1) [2] on the other hand has the same switch but with a different
> meaning.
> 
> Respect this and check the date(1) abilities before usage, error on non
> working version.  Use the well known pre- and suffixes for the GNU variant of
> a tool on *BSD hosts to search for a working date(1) version.
> 
> [1] http://man7.org/linux/man-pages/man1/date.1.html [2]
> http://www.freebsd.org/cgi/man.cgi?query=date
> 
> Signed-off-by: Andreas Bießmann <andreas.devel at googlemail.com>

Applied to u-boot/master, thanks!

-- 
Tom
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