kbuild: add user-supplied CPPFLAGS, AFLAGS and CFLAGS
Like Linux Kernel, this commit provides environment variables
KCPPFLAGS, KAFLAGS and KCFLAGS, which are useful to pass
additional options.
Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
diff --git a/Makefile b/Makefile
index 970a219..0191869 100644
--- a/Makefile
+++ b/Makefile
@@ -584,6 +584,11 @@
export CONFIG_SYS_TEXT_BASE
+# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
+KBUILD_CPPFLAGS += $(KCPPFLAGS)
+KBUILD_AFLAGS += $(KAFLAGS)
+KBUILD_CFLAGS += $(KCFLAGS)
+
# Use UBOOTINCLUDE when you must reference the include/ directory.
# Needed to be compatible with the O= option
UBOOTINCLUDE := \