diff options
| author | Masahiro Yamada <yamada.masahiro@socionext.com> | 2018-04-16 13:18:31 +0900 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2018-04-28 10:42:35 -0400 |
| commit | 1eb2e71edd55e16562e3912881c449db69623352 (patch) | |
| tree | 5a9a8a36517c9d693ecb58be86a46843a8281220 /Makefile | |
| parent | fac379e1ea4090471c7fdbc184f83409ae4be942 (diff) | |
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>
Diffstat (limited to 'Makefile')
| -rw-r--r-- | Makefile | 3 |
1 files changed, 3 insertions, 0 deletions
@@ -595,6 +595,9 @@ endif KBUILD_CFLAGS += $(call cc-option,-fno-stack-protector) KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks) +# change __FILE__ to the relative path from the srctree +KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) + KBUILD_CFLAGS += -g # $(KBUILD_AFLAGS) sets -g, which causes gcc to pass a suitable -g<format> # option to the assembler. |