From: Masahiro Yamada <yamada.m@jp.panasonic.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH 0/5] Do not use __DATE__ and __TIME__ anymore
Date: Thu, 17 Apr 2014 20:41:14 +0900 [thread overview]
Message-ID: <20140417204113.6CEC.AA925319@jp.panasonic.com> (raw)
In-Reply-To: <20140417110732.85F553803FE@gemini.denx.de>
Hi Wolfgang
On Thu, 17 Apr 2014 13:07:32 +0200
Wolfgang Denk <wd@denx.de> wrote:
> Dear Masahiro,
>
> In message <1397721632-18797-1-git-send-email-yamada.m@jp.panasonic.com> you wrote:
> >
> > The aim of this series is to prohibit using __DATE__ and __TIME__.
>
> What is bad about using these?
include/generated/timestamp_autogenerated.h provides us
the last build date correctly because it is touched every time.
__DATE__ or __TIME__ might give us unexpectedly old date
because it is not updated unless the source file is modified.
One more reason.
Using __DATE__ / __TIME__ here and there makes the binary
comparison difficult.
I often use MD5SUM comparison
to confirm that my changes to the build system still produce the same
output.
I want to generate the completely same result
if the source code is the same.
This can be achieved by simply disabling the timestamp file and version
file.
I want to gather timestamp stuff to one place for easy control of it.
Best Regards
Masahiro Yamada
next prev parent reply other threads:[~2014-04-17 11:41 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-17 8:00 [U-Boot] [PATCH 0/5] Do not use __DATE__ and __TIME__ anymore Masahiro Yamada
2014-04-17 8:00 ` [U-Boot] [PATCH 1/5] rand: do not surround function declarations by #ifdef Masahiro Yamada
2014-04-17 8:00 ` [U-Boot] [PATCH 2/5] net: rename and refactor eth_rand_ethaddr() function Masahiro Yamada
2014-04-17 8:08 ` Joe Hershberger
2014-04-17 11:09 ` Wolfgang Denk
2014-04-17 8:00 ` [U-Boot] [PATCH 3/5] blackfin: replace bfin_gen_rand_mac() with eth_random_addr() Masahiro Yamada
2014-04-17 19:07 ` Mike Frysinger
2014-04-18 9:25 ` Masahiro Yamada
2014-04-17 8:00 ` [U-Boot] [PATCH 4/5] fs: ubifs: drop __DATE__ and __TIME__ Masahiro Yamada
2014-04-17 8:00 ` [U-Boot] [PATCH 5/5] kbuild: build with -Werror=date-time if the compiler supports it Masahiro Yamada
2014-04-17 11:07 ` [U-Boot] [PATCH 0/5] Do not use __DATE__ and __TIME__ anymore Wolfgang Denk
2014-04-17 11:41 ` Masahiro Yamada [this message]
2014-04-17 14:48 ` Wolfgang Denk
2014-04-17 19:10 ` Mike Frysinger
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