From 215bb1c14749591d2ac486682fad68fffc1c6bdb Mon Sep 17 00:00:00 2001 From: Daniel Schwierzeck Date: Fri, 26 Jan 2018 16:31:04 +0100 Subject: [PATCH] README: add doc for how to supply user specific compiler flags to Kbuild 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 --- README | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/README b/README index b53ea7dfe3..b055ae7ef2 100644 --- a/README +++ b/README @@ -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 -- 2.39.5