[yocto] Building clang with Yocto

[Jim Rafert]

Hi Liviu,

Thanks for the tip.  I had everything but the override for do_install_class-nativesdk().

One question please.

Will that override prevent the gcc compilers from being installed in nativesdk?  Or should I duplicate the existing do_install_class-nativesdk(), and add the clang stuff?

-Jim-


________________________________
From: Liviu Gheorghisan [liviu.gheorghisan at enea.com]
Sent: Tuesday, December 09, 2014 9:27 AM
To: Yu, Chan KitX; Jim Rafert; yocto at yoctoproject.org
Subject: Re: [yocto] Building clang with Yocto

Hello Yu, Jim

I think you can get the clang executable into the SDK installer script with something like this:

1. Add this dependency in nativesdk-packagegroup-sdk-host.bb:
RDEPENDS_${PN} += "nativesdk-<name-of-clang-recipe>"

2. In the clang recipe add this install() overwrite for the nativesdk class - this will install it into the SDK sysroot:
do_install_class-nativesdk() {
    install -d ${D}${bindir}
    install -m 0755 clang ${D}${bindir}
}

3. The clang recipe (I don't know if it has a recipe of its own, or it's part of the LLVM recipe) should also inherit from nativesdk:
BBCLASSEXTEND = "nativesdk"

Basically this should get your clang executable inside the SDK installer. Sure you can add more executables related to clang (like the llvm-related ones) in the install_class-nativesdk() function.

- Liviu Gheorghisan

On 12/09/2014 04:36 AM, Yu, Chan KitX wrote:

I **think** I'm just inches away from success. I think I just need to invoke a correct install command somewhere in the do_install function but so far I have not managed to do so. But right now the alternative way of jamming the compiler into the SDK sounds tempting to me.

-----Original Message-----
From: Yu, Chan KitX
Sent: Tuesday, December 09, 2014 9:19 AM
To: 'Jim Rafert'; yocto at yoctoproject.org<mailto:yocto at yoctoproject.org>
Subject: RE: Building clang with Yocto

Hi Jim,

How did you jam the clang compiler into the SDK tarball?

Chan Kit

-----Original Message-----
From: Jim Rafert [mailto:jimr at spectralogic.com]
Sent: Tuesday, December 09, 2014 1:48 AM
To: yocto at yoctoproject.org<mailto:yocto at yoctoproject.org>; Yu, Chan KitX
Subject: Building clang with Yocto

Hello Chan,

I have been working to a similar goal, to include clang in the toolchain to be used for compiling applications to run on the target.  Using clang to compile the OS and kernel are not required or  desired by me.

You may get some insight from the thread I started in November on the subject.  I'm not sure that this contains all of the posts on the subject. You may want to search the archive for November.

I have not been successful yet in getting clang actually packaged in the toolchain, in the Yocto build,  but at least it builds.  I have a postbuild script that takes the built clang compiler from the work directory and jams it into the SDK tarball that is embedded in the sdk install script.

-Jim-


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