[canutils] add option to select between toolchain's and BSP's kernel headers

The canutils need the linux/can.h header from the kernel. Normally this
header is provided by the toolchain. If the user is using a toolchain
based on a kernel < 2.6.25 the header is missing.

In the past PTXdist uses the BSP's kernel headers instead, but with
kernel > 2.6.30 this may breaks with the following error message:

    "error: asm/bitsperlong.h: No such file or directory"

So we give the user (or rather the BSP integrator) the choice to select
between these two.....

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

1 files changed, 12 insertions, 0 deletions

diff --git a/rules/canutils.in b/rules/canutils.in
index ba98184ca..c48959b2e 100644
--- a/rules/canutils.in
+++ b/rules/canutils.in
@@ -3,6 +3,7 @@
 menuconfig CANUTILS
 	tristate
 	prompt "canutils                      "
+	select KERNEL	if CANUTILS_BSP_KERNEL
 	help
 	  The canutils package contains tools to configure
 	  and test the Socket CAN framework.
@@ -14,6 +15,17 @@ config CANUTILS_VERSION
 	string
 	default "3.0.2"
 
+config CANUTILS_BSP_KERNEL
+	bool "use BSP's kernel headers instead of toolchain's"
+	help
+	  Select this if you're using a toolchain based on a
+	  kernel < 2.6.25. This kernel doesn't provide the
+	  necessary headers.
+
+	  On the other hand, don't select it for BSP
+	  kernels > 2.6.30, otherwise compilation breaks with:
+	  "error: asm/bitsperlong.h: No such file or directory"
+
 config CANUTILS_CANCONFIG
 	bool
 	prompt "canconfig"