[U-Boot] kbuild: use -fmacro-prefix-map to make __FILE__ a relative path

[Tom Rini]

On Mon, Apr 16, 2018 at 01:18:31PM +0900, Masahiro Yamada wrote:

> The __FILE__ macro is used everywhere in U-Boot to locate the file
> printing the log message, such as WARN_ON(), etc.  If U-Boot is
> built out of tree, this can be a long absolute path.
> 
> This is because Kbuild runs in the objtree instead of the srctree,
> then __FILE__ is expanded to a file path prefixed with $(srctree)/.
> 
> A brand-new option from GCC, -fmacro-prefix-map, solves this problem.
> If your compiler supports it, __FILE__ is the relative path from the
> srctree regardless of O= option.  This provides more readable log,
> more reproducible builds, and smaller image size.
> 
> [ Linux commit: a73619a845d5625079cc1b3b820f44c899618388 ]
> 
> Signed-off-by: Masahiro Yamada <yamada.masahiro at socionext.com>
> Reviewed-by: Simon Glass <sjg at chromium.org>

Applied to u-boot/master, thanks!

-- 
Tom
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