[U-Boot] [U-Boot, v2, 5/5] kbuild: build with -Werror=date-time if the compiler supports it

[Tom Rini]

On Fri, Apr 18, 2014 at 07:09:51PM +0900, Masahiro Yamada wrote:

> Using __DATE__, __TIME__ would make the build non-deterministic.
> 
> If the code needs to refer to build date/time, use U_BOOT_DATE and
> U_BOOT_TIME in include/generated/timestamp_autogenerated.h instead.
> 
> This commit has been imported from Linux Kernel,
> which should be applied to U-Boot too:
> 
>     commit fe7c36c7bde12190341722af69358e42171162f3
>     Author: Josh Triplett <josh at joshtriplett.org>
>     Date:   Mon Dec 23 13:56:06 2013 -0800
> 
>     Makefile: Build with -Werror=date-time if the compiler supports it
> 
>     GCC 4.9 and newer have a new warning -Wdate-time, which warns on any use
>     of __DATE__, __TIME__, or __TIMESTAMP__, which would make the build
>     non-deterministic.  Now that the kernel does not use any of those
>     macros, turn on -Werror=date-time if available, to keep it that way.
> 
>     The kernel already (optionally) records this information at build time
>     in a single place; other kernel code should not duplicate that.
> 
> Signed-off-by: Josh Triplett <josh at joshtriplett.org>
> Signed-off-by: Michal Marek <mmarek at suse.cz>
> Signed-off-by: Masahiro Yamada <yamada.m at jp.panasonic.com>

Applied to u-boot/master, thanks!

-- 
Tom
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