Hello there!

I am having a bit of a problem here: I am using Slackware with a custom kernel, and I also need to use VirtualBox. VirtualBox need a kernel module in order to work.

When I first installed it from a Slackpkg on the stock kernel, it worked perfectly and added a nice /etc/rc.d/rc.vboxdrv to manage it. This is important, because this script was used to update the driver in custom Kernels via "vboxdrv setup"

But now they changed it and doing /etc/rc.d/rc.vboxdrv setup will prompt this error: "Not implemented! Please use the virtualbox-kernel.SlackBuild available at SlackBuilds.org instead."

But If I try to install the SlackBuild from my new Kernel, it fails during compile time. Doing it using the older kernel works, but I get a module for the old Kernel, so it is not useful at all!

The only error I can see when I try to compile is: "1: error: implicit declaration of function 'page_cache_release' [-Werror=implicit-function-declaration]
", but I honestly don't know what it means, so I can't do much about it

Is in there any way of using VirtualBox with a custom Kernel on Slackware?

Thank you in advance!

vladimir1986 --

It seems that the configure.ac files for newer versions of a lot of programs default to -Werror ( treat warnings as errors ).

You might be able to get past that particular error by appending -Wno-error=implicit-function-declaration to the CFLAGS and / or CXXFLAGS in the SlackBuild.

If that doesn't do it, maybe the gcc warning options documentation has an answer.

-- kjh

Agh: any reason they did that? I find it dumb to default to such option! it is very rare to find a code without warnings.

I added a line to my SlackBuild

SLKCFLAGS="-Wnoerror=implicit-function-declaration"


That did loads of nothing: It seems it doesn't work on C++, but I'll think that it is written in C. I also tried to simply play with CFLAGS and CXXFLAGS, but same result (SLKCFLAGS should deal with both as needed anyway). I am still getting the same warning.

I didn't see any option to simply disable this behaviour from any warning, I also tried simply Wnoerror and Wno-implicit, but that damn thing doesn't want to die, and I get the same warning.

I am finding weird it compiles with the old kernel too. May it be a bug?

Dang, vladimir1986, you've exceeded my personal knowledge base

I downloaded and built the virtualbox-kernel package without any errors.

Worse, there were no instances of -Werror in any of the virtualbox-kernel Makefiles.

Maybe you could find the -Werror in the Makefiles and modify the already-existing sed command in the Slackbuild ?

[EDIT] I just noticed that virtualbox-kernel.SlackBuild does not set CFLAGS, CCFLAGS or SLKFLAGS.

Nor does it invoke a configure script.

I suppose you'll have to `sed` the Makefiles to eliminate the -Werror Args ...

[/EDIT]

-- kjh