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README: add doc for how to supply user specific compiler flags to Kbuild

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Probably not all users are aware of this possibility, thus add a
pointer to the README. Also add a useful example.

Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
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Daniel Schwierzeck 2018-01-26 16:31:04 +01:00 committed by Tom Rini
parent bf8f4c4400
commit 215bb1c147
1 changed files with 5 additions and 0 deletions
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@ -3719,6 +3719,11 @@ this behavior and build U-Boot to some external directory:
Note that the command line "O=" setting overrides the KBUILD_OUTPUT environment
variable.
User specific CPPFLAGS, AFLAGS and CFLAGS can be passed to the compiler by
setting the according environment variables KCPPFLAGS, KAFLAGS and KCFLAGS.
For example to treat all compiler warnings as errors:
make KCFLAGS=-Werror
Please be aware that the Makefiles assume you are using GNU make, so
for instance on NetBSD you might need to use "gmake" instead of