[PATCH] scripts/dtc: only append to HOST_EXTRACFLAGS instead of overwriting

[Uwe Kleine-König]

This corresponds to Linux commit 7e2521a85c98 (that currently sits in
linux-next) with the same short log.

When building with

	$ HOST_EXTRACFLAGS=-g make

the expectation is that host tools are built with debug informations.
This however doesn't happen if the Makefile assigns a new value to the
HOST_EXTRACFLAGS instead of appending to it. So use += instead of := for
the first assignment.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig at pengutronix.de>
---
 scripts/dtc/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/dtc/Makefile b/scripts/dtc/Makefile
index 06a265cf7b51..721e8e2b8c2e 100644
--- a/scripts/dtc/Makefile
+++ b/scripts/dtc/Makefile
@@ -14,7 +14,7 @@ libfdt-objs	:= $(libfdt-objs:%.o=libfdt/%.o)
 fdtget-objs    += fdtget.o $(libfdt-objs) util.o
 
 # Source files need to get at the userspace version of libfdt_env.h to compile
-HOST_EXTRACFLAGS := -I$(src)/libfdt
+HOST_EXTRACFLAGS += -I$(src)/libfdt
 
 ifeq ($(wildcard /usr/include/yaml.h),)
 ifneq ($(CHECK_DTBS),)
-- 
2.28.0