linux-imx-headers: fix imx headers missing in sdk

i.MX-specific headers are missing in SDK once generated via image
do_populate_sdk task.

This was caused by dropped ALLOW_EMPTY package-controlling variable
which is required for this recipe in order to indicate that package can
have RDEPENDS.

Additional RDEPENDS are also required by packages using new mechanisms
to include linux-imx-headers, this allows headers to be propagated to
the SDK when dependent package is included.

Introduce ALLOW_EMPTY in recipe and RDEPENDS in use-imx-headers bbclass
to have imx headers to be populated in the SDK.

Signed-off-by: Andrey Zhizhikin <andrey.zhizhikin@leica-geosystems.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/classes/use-imx-headers.bbclass b/classes/use-imx-headers.bbclass
index d2214b6d..fcec68c8 100644
--- a/classes/use-imx-headers.bbclass
+++ b/classes/use-imx-headers.bbclass
@@ -14,6 +14,12 @@
 # Copyright 2018 (C) O.S. Systems Software LTDA.
 
 DEPENDS_append_imx = " linux-imx-headers"
+
+# Set runtime dependency of -dev for package inheriting this class to
+# linux-imx-headers-dev package. This is required in order to propagate
+# headers into the SDK
+RDEPENDS_${PN}-dev += "linux-imx-headers-dev"
+
 PACKAGE_ARCH_imx ?= "${MACHINE_SOCARCH}"
 
 STAGING_INCDIR_IMX = "${STAGING_INCDIR}/imx"