Sometimes more than one kernel is installed on a machine and you might want to build KEDR for one of these kernels, different from the currently running kernel. Starting from version 0.2.1, KEDR supports this.

Suppose you would like to build KEDR for the kernel, say, "2.6.39-testbox" and you have build files for that kernel in /lib/modules/2.6.39-testbox/build, as usual.

It is assumed below that KEDR version 0.x.y is used, its sources are unpacked to subdirectory kedr-0.x.y and the build process will take place in build subdirectory.

From build subdirectory, configure KEDR as follows:

cmake \
-DCMAKE_TOOLCHAIN_FILE=../kedr-0.2.1/cmake/platform/linux-x86-generic.cmake \
-DCMAKE_SYSTEM_VERSION="2.6.39-testbox" \
../kedr-0.x.y

After that, you can execute make and make install as usual.

As you can see, one of the differences from the ordinary build is that you also need to specify the version of the target system (i.e. the value that uname -r would return for that system) explicitly in CMAKE_SYSTEM_VERSION.

You also need to tell the build system that it is actually a cross-build. The parameters appropriate for this build type are set in the so called toolchain files. If you build KEDR for another kernel on the same machine (or at least a machine with the same architecture), you can select linux-x86-generic.cmake toolchain file that KEDR provides.

Note that self-testing support (make check) is currently disabled for such cross-builds. The documentation and the examples are not installed in this case either.