Rather than placing object files and library files right in the
source tree, they're instead put into a parallel build tree.
The build tree is made with the lndir command:
cd ~/DRI-CVS
ln -s xc XFree40
mkdir build
cd build
lndir -silent -ignorelinks ../XFree40
The build tree will be populated with symbolic links which point back into the CVS source tree.
Advanced users may have several build trees for compiling and testing with different options.
The ~/DRI-CVS/build/xc/config/cf/host.def file is used
to configure the XFree86 build process.
You can change it to customize your build options or make adjustments
for your particular system configuration
The default host.def file will look something like this:
#define DefaultCCOptions -Wall
(i386) #define DefaultGcc2i386Opt -O2
(Alpha) #define DefaultGcc2AxpOpt -O2 -mcpu=ev6 (or similar)
#define LibraryCDebugFlags -O2
#define BuildServersOnly YES
#define XF86CardDrivers vga tdfx mga ati i810
#define LinuxDistribution LinuxRedHat
#define DefaultCCOptions -ansi GccWarningOptions -pipe
#define BuildXF86DRI YES
/* Optionally turn these on for debugging */
/* #define GlxBuiltInTdfx YES */
/* #define GlxBuiltInMga YES */
/* #define GlxBuiltInR128 YES */
/* #define GlxBuiltInRadeon YES */
/* #define DoLoadableServer NO */
#define SharedLibFont NO
The ProjectRoot variable specifies where the XFree86 files
will be installed.
We recommend installing the DRI files over your existing XFree86
installation - it's generally safe to do and less error-prone.
This policy is different than what we used to recommend.
If XFree86 4.x is not installed in /usr/X11R6/ you'll have to
add the following to the host.def file:
#define ProjectRoot pathToYourXFree86installation
Note the XF86CardDrivers line to be sure your card's driver is listed.
If you want to enable 3DNow! optimizations in Mesa and the DRI drivers, you should add the following:
#define MesaUse3DNow YES
You don't have to be using an AMD processor in order to enable
this option. The DRI will look for 3DNow! support and runtime
and only enable it if applicable.
If you want to enable SSE optimizations in Mesa and the DRI drivers, you must upgrade to a Linux 2.4.x kernel. Mesa will verify that SSE is supported by both your processor and your operating system, but to build Mesa inside the DRI you need to have the Linux 2.4.x kernel headers in /usr/src/linux. If you enable SSE optimizations with an earlier version of the Linux kernel in /usr/src/linux, Mesa will not compile. You have been warned. If you do have a 2.4.x kernel, you should add the following:
#define MesaUseSSE YES
To compile the complete DRI tree:
cd ~/DRI-CVS/build/xc/
make World >& world.log
Or if you want to watch the compilation progress:
cd ~/DRI-CVS/build/xc/
make World >& world.log &
tail -f world.log
With the default compilation flags it's normal to get a lot of
warnings during compilation.
Building will take some time so you may want to go check your email or visit slashdot.
WARNING: do not use the -j option with make. It's reported that it does not work with XFree86/DRI.
Using your text editor, examine world.log for errors
by searching for the pattern ***.
Verify that the DRI kernel module(s) for your system were built:
cd ~/DRI-CVS/build/xc/programs/Xserver/hw/xfree86/os-support/linux/drm/kernel
ls
For the 3dfx Voodoo, you should see tdfx.o. For the Matrox G200/G400, you should see mga.o. For the ATI Rage 128, you should see r128.o. For the ATI Radeon, you should see radeon.o. For the Intel i810, you should see i810.o.
If the DRI kernel module(s) failed to build you should verify that you're using the right version of the Linux kernel. The most recent kernels are not always supported.
If your build machine is running a different version of the kernel
than your target machine (i.e. 2.2.x vs. 2.4.x), make will
select the wrong kernel headers. This can be fixed by explicitly
setting the value of TREE.
If the path to your kernel source is
/usr/src/linux-2.4.x,
cd ~/DRI-CVS/build/xc/programs/Xserver/hw/xfree86/os-support/linux/drm/kernel
make TREE=/usr/src/linux-2.4.x/include
or alternatively, edit Makefile to include this change.
After fixing the errors, run make World again.
Later, you might just compile parts of the source tree but it's
important that the whole tree will build first.
The DRI kernel modules will be in
~/DRI-CVS/build/xc/programs/Xserver/hw/xfree86/os-support/linux/drm/kernel/.
To load the appropriate DRM module in your running kernel you can
either use ismod and restart your X server or copy the kernel module
to /lib/modules/2.4.x/kernel/drivers/char/drm/ then run
depmod and restart your X server.
Make sure you first unload any older DRI kernel modules that might be already loaded.
Note that some DRM modules require that the agpgart module
be loaded first.