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This adds the initial support for using autoconf configuration. Support
is available for shared Xlib driver builds. Later this will be extended
to dri and osmesa-only builds and possibly targetting non-X backends.
Support for static library builds will also be added.
The configure script fills in the autoconf config. This is then used by
running `make autoconf' after ./configure.
Testing has been done on Linux/GNU. The configure script tries to
faithfully reproduce the current configs/linux* and configs/freebsd*.
Other platforms can be handled later by adding similar statements and
feature tests.
Pkg-config is used to search for packages when possible. This makes the
build much more flexible and robust to the user's configuration. This
requires that the pkg-config autoconf macros pkg.m4 are included in
aclocal.m4. This requires autoconf and aclocal from autoconf and
automake, respectively.
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Most of the programs list their dependencies on the Mesa libraries in
their Makefiles. This works with the default configuration where
APP_LIB_DEPS only lists external libraries. This changes the
linux-osmesa configs and the osdemos Makefile to follow that convention.
Some cleanup of the Makefile is also added to refer to the GL libraries
through the existing variables rather than hardcoding their names.
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Linking of the programs breaks when using a static libGL and the GNU ld
option --as-needed. This is because libXext is needed for the XShm
functions.
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No real code yet. Just stand-ins and make/build infrastructure.
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Use a GCC option to work around aliasing bugs. See commit 013dbcd for
more details.
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Quite a while ago, the GCC option -fexceptions was added for building
libglut. See here:
http://article.gmane.org/gmane.comp.video.mesa3d.devel/9499
This was missing in the linux-dri targets.
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Mesa currently disables -fPIC for DRI on x86, but most Linux distros are
re-enabling -fPIC for all DRI arches. Let's just do that here since
that's normally what's wanted for shared libraries. Some justification:
http://bugs.gentoo.org/show_bug.cgi?id=110840#c9
On the other hand, position-independent code is only necessary when
building shared libraries, so disable it for the static cases.
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Most Linux distros work around aliasing problems in Mesa by compiling
with the GCC option -fno-strict-aliasing. Two examples:
https://bugs.freedesktop.org/show_bug.cgi?id=6046
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=394311
This makes -fno-strict-aliasing the default with a comment that
developers should consider commenting it out. There is a already a note
about these bugs in docs/helpwanted.html.
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Since libglut is no longer hardcoded, we can build the xdemos programs
so long as a GLX enabled libGL and libGLU have been built.
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GL_LIB_DEPS was missing -lXdamage and -lXfixes, which was causing
linker errors when trying to build the programs.
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The linux-static target was missing necessary libraries and hardcoding
their location to /usr/X11R6/lib. This makes it comparable to the x86
and x86-64 static targets.
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This allows IDEs such as Eclipse to get the correct c-preprocessor flags used
from the build output.
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It's basically luck if it works with the C compiler on some platforms...
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now.
Cleanup some of the debugging output.
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To build with mesa, need -DMESA in makefile/config file.
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This is appropriate as this is not a "pipe driver for the i915" as the
old name would suggest, but rather a dri driver that can provide "winsys"
backends to softpipe/i915/i965/etc pipe drivers, running under the
intel DDX, drm, etc.
It also frees up the i915pipe name for something more appropriate, ie
mesa/pipe/i915pipe.
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This hands all rendering off to the softpipe rasterizer.
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into softpipe_0_1_branch
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into softpipe_0_1_branch
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