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H A D | Makefile | 1eb2e71edd55e16562e3912881c449db69623352 Sun Apr 15 23:18:31 CDT 2018 Masahiro Yamada <yamada.masahiro@socionext.com> kbuild: use -fmacro-prefix-map to make __FILE__ a relative path
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@socionext.com> Reviewed-by: Simon Glass <sjg@chromium.org>
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