[yocto] Shouldn't linux/version.h appear in the SDK's host sysroot?

[Zhang, Jessica]

Hi Patrick,

The toolchain and sysroot are behaving correctly,  the x86_64-pokysdk-linux contains the cross tools for your development host, whereas armv7a-vfp-neon-poky-linux-gnueabi contains your target sysroot, and all your target programs should be using files against that sysroot.  By not knowing how your compile your package, but if you look at our ADT manual, you should source the environment setup script before you try to use the toolchain and you also need to pass sysroot option to your compiler and linker for them to go to the target sysroot location for headers and libraries.

Thanks,
Jessica

-----Original Message-----
From: yocto-bounces at yoctoproject.org [mailto:yocto-bounces at yoctoproject.org] On Behalf Of Patrick Turley
Sent: Thursday, January 10, 2013 2:46 PM
To: yocto at yoctoproject.org
Subject: [yocto] Shouldn't linux/version.h appear in the SDK's host sysroot?

I'm using a Yocto-based SDK, produced by:

    bitbake meta-toolchain-sdk

This creates the file

    poky-eglibc-x86_64-arm-toolchain-gmae-1.3.sh

in the directory

    build/tmp/deploy/sdk

I ran the installation script to install the SDK on my build system. Within the SDK installation directory, under "sysroots", I have the following two directories:

    armv7a-vfp-neon-poky-linux-gnueabi
    x86_64-pokysdk-linux

Unless I'm mistaken, the first one reflects the target environment, and the second one contains what I need to do cross-compilation. Thus, the latter contains the cross-compilation tools, and that's the sysroot to which all my builds are directed.

I'm compiling the lm_sensors package for my target. As part of its work, it tries to discover the version of the target linux kernel. To do this, it compiles a very small file (etc/config.c) that includes the header file <linux/kernel.h>.

As it happens, <linux/kernel.h> does *not* appear in the cross-compilation sysroot, so this simple task fails. That header file *does* appear in the target sysroot, but that's of no use to me in the cross-compilation process.

I believe one of the following is true:

1) The lm_sensors package is doing something entirely legitimate, and the file <linux/kernel.h> *should* appear in the cross-compilation sysroot to support this. The Yocto SDK build target needs a small fix so that <linux/kernel.h> is properly added to the cross-compilation sys root. In the meantime, I can work around this oversight by creating a symbolic link.

2) I've made a mistake in setting up my build environment because I don't understand how cross-compilation *should* be done. If done properly, the cross-compilation process will have access to *both* sysroots and get what it needs from each. If this is the case, please tell me what I appear to have done wrong.

3) Something else.

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