[PATCH v3 7/7] linux: Add cross-compilation support

[Alexander Smirnov <asmirnov@ilbers.de>]

Add possibility to cross-compile ARM target.

Signed-off-by: Alexander Smirnov <asmirnov@ilbers.de>
---
 meta/recipes-kernel/linux/files/build-kernel.sh | 16 ++++++++++++++++
 meta/recipes-kernel/linux/linux-custom.inc      |  4 +---
 2 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/meta/recipes-kernel/linux/files/build-kernel.sh b/meta/recipes-kernel/linux/files/build-kernel.sh
index 1ec094e..ecfbf83 100644
--- a/meta/recipes-kernel/linux/files/build-kernel.sh
+++ b/meta/recipes-kernel/linux/files/build-kernel.sh
@@ -9,6 +9,22 @@
 
 set -e
 
+host_arch=$(dpkg --print-architecture)
+target_arch=$2
+
+if [ "$host_arch" != "$target_arch" ]; then
+    case $target_arch in
+    armhf)
+        export ARCH=arm
+        export CROSS_COMPILE="arm-linux-gnueabihf-"
+        ;;
+    *)
+        echo "error: unsupported architecture ($target_arch)"
+        exit 1
+        ;;
+    esac
+fi
+
 REPACK_DIR="$1/../repack"
 REPACK_LINUX_IMAGE_DIR="${REPACK_DIR}/linux-image"
 REPACK_LINUX_HEADERS_DIR="${REPACK_DIR}/linux-headers"
diff --git a/meta/recipes-kernel/linux/linux-custom.inc b/meta/recipes-kernel/linux/linux-custom.inc
index f7641ef..d5fc5a6 100644
--- a/meta/recipes-kernel/linux/linux-custom.inc
+++ b/meta/recipes-kernel/linux/linux-custom.inc
@@ -20,8 +20,6 @@ python() {
                              'linux-headers-' + kernel)
 }
 
-ISAR_CROSS_COMPILE = "0"
-
 inherit dpkg-base
 
 SRC_URI += "file://build-kernel.sh"
@@ -45,5 +43,5 @@ dpkg_runbuild() {
 	export KERNEL_DEBIAN_DEPENDS="${KERNEL_DEBIAN_DEPENDS}"
 	export KERNEL_HEADERS_DEBIAN_DEPENDS="${KERNEL_HEADERS_DEBIAN_DEPENDS}"
 
-	sudo -E chroot ${BUILDCHROOT_DIR} /build-kernel.sh ${PP}/${PPS}
+	sudo -E chroot ${BUILDCHROOT_DIR} /build-kernel.sh ${PP}/${PPS} ${DISTRO_ARCH}
 }
-- 
2.1.4