device-tree: Add C pre-process for dts

Signed-off-by: Jason Wu <jason.wu.misc@gmail.com>
Signed-off-by: Nathan Rossi <nathan@nathanrossi.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/recipes-bsp/device-tree/device-tree.bb b/recipes-bsp/device-tree/device-tree.bb
index c5dd2a6b..3733754c 100644
--- a/recipes-bsp/device-tree/device-tree.bb
+++ b/recipes-bsp/device-tree/device-tree.bb
@@ -44,9 +44,13 @@ do_compile() {
                 DTS_NAME=`basename -s .dts ${DTS_FILE}`
                 for d in ${KERNEL_DTS_INCLUDE}; do
                         dtc_include="${dtc_include} -i $d"
+                        cpp_include="${cpp_include} -I${d}"
                 done
+                ${CPP} -E -nostdinc -Ulinux -I${WORKDIR}/devicetree \
+                        ${cpp_include} -x assembler-with-cpp \
+                        -o ${DTS_FILE}.pp ${DTS_FILE}
                 dtc -I dts -O dtb ${DEVICETREE_FLAGS} -i ${WORKDIR}/devicetree \
-                        ${dtc_include} -o ${DTS_NAME}.dtb ${DTS_FILE}
+                        ${dtc_include} -o ${DTS_NAME}.dtb ${DTS_FILE}.pp
         done
 }