On Monday 08 March 2010 12:46:53 Ruben Smits wrote:
> I have different kernels, I thought I had to point the build to the
> right headers, if not, even better, than i can reuse my previous
> gnulinux build also for the rt-preempt kernel.

Indeed. No need to point to kernel headers. Only some RTAI
versions/configurations require kernel headers, all other targets don't.

Peter

On Mar 8, 2010, at 06:46 , Ruben Smits wrote:

> I have different kernels, I thought I had to point the build to the
> right headers, if not, even better, than i can reuse my previous
> gnulinux build also for the rt-preempt kernel.
>
> Ruben
>
> On Mon, Mar 8, 2010 at 12:20 PM, Klaas Gadeyne <klaas [dot] gadeyne [..] ...> wrote:
>> On Mon, Mar 8, 2010 at 11:54 AM, Ruben Smits
>> <ruben [dot] smits [..] ...> wrote:
>>> Hi,
>>>
>>> I'm trying to compile RTT for a Linux-rt preempt kernel and want to
>>> point the build-system to the right linux-headers, but cmake seems to
>>> not pick up my LINUX_SOURCE_DIR definition:
>>>
>>> I execute cmake as follows:
>>>
>>> cd rtt-svn/build && cmake -DCMAKE_INSTALL_PREFIX=`rospack find
>>> rtt-1.10`/rtt/ -DOROCOS_TARGET=gnulinux -DCMAKE_PREFIX_PATH=
>>> -DCMAKE_BUILD_TYPE="RTT" -DCORBA_IMPLEMENTATION="OMNIORB"
>>> -DENABLE_CORBA=ON
>>> -DLINUX_SOURCE_DIR=/usr/src/linux-headers-2.6.28-3-rt ..
>>>
>>> but make VERBOSE does not show the include path to my kernel headers:
>>>
>>> Building CXX object
>>> src/CMakeFiles/orocos-rtt-dynamic_gnulinux.dir/scripting/PropertyParser.cpp.o
>>> cd /home/common/src/svn/robotics-ros/packages/orocos/rtt/rtt-1.10-rt/rtt-svn/build/src
>>> && /usr/bin/c++ -DOROCOS_TARGET=gnulinux -DRTT_DLL_EXPORT -fPIC
>>> -I/home/common/src/svn/robotics-ros/packages/orocos/rtt/rtt-1.10-rt/rtt-svn/src
>>> -I/home/common/src/svn/robotics-ros/packages/orocos/rtt/rtt-1.10-rt/rtt-svn/build/src
>>> -I/home/common/src/svn/robotics-ros/packages/orocos/rtt/rtt-1.10-rt/rtt-svn/build/src/os
>>> -I/home/common/src/svn/robotics-ros/packages/orocos/rtt/rtt-1.10-rt/rtt-svn/build/src/os/gnulinux
>>> -o CMakeFiles/orocos-rtt-dynamic_gnulinux.dir/scripting/PropertyParser.cpp.o
>>> -c /home/common/src/svn/robotics-ros/packages/orocos/rtt/rtt-1.10-rt/rtt-svn/src/scripting/PropertyParser.cpp
>>>
>>>
>>> Is this a bug in the buildsystem, or did I forget something?
>>
>> Why do you think RTT needs the LINUX_SOURCE_DIR for compiling?
>>
>> AFAIK
>> <http://www.orocos.org/stable/documentation/rtt/v1.10.x/doc-xml/orocos-installation.html>,
>> section 1.3
>> it's simply not used.
>>
>> Klaas

No kernel-specific include line shows up in our Ubuntu w/ RT builds. We've never had to do this, but then we don't hand build any kernels either. If you've done that, maybe you'll have trouble?
S