From: Daniel Schwierzeck Date: Fri, 26 Jan 2018 15:31:04 +0000 (+0100) Subject: README: add doc for how to supply user specific compiler flags to Kbuild X-Git-Url: http://git.dujemihanovic.xyz/?a=commitdiff_plain;h=215bb1c14749591d2ac486682fad68fffc1c6bdb;p=u-boot.git 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 --- 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