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

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@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@joshtriplett.org Signed-off-by: Michal Marek mmarek@suse.cz Signed-off-by: Masahiro Yamada yamada.m@jp.panasonic.com

Applied to u-boot/master, thanks!