From 39087f636afcee058fc9af2c58cb1e2474c9b258 Mon Sep 17 00:00:00 2001
From: Keith Whitwell <keithw@vmware.com>
Date: Fri, 14 May 2010 10:55:07 +0100
Subject: [PATCH] scons: add 'targets' variable, for specifying ... targets

Ideally scons should be able to work backwards from the list of
targets to figure out which drivers, state trackers and other
convenience libraries need to be built.
---
 SConstruct                     | 23 +++++++++++++++++++++++
 src/gallium/targets/SConscript | 20 ++++++++++++++------
 2 files changed, 37 insertions(+), 6 deletions(-)

diff --git a/SConstruct b/SConstruct
index 28ed6ea78c0..c843b41b0dc 100644
--- a/SConstruct
+++ b/SConstruct
@@ -31,6 +31,7 @@ import common
 # Configuration options
 
 default_statetrackers = 'mesa'
+default_targets = 'none'
 
 if common.default_platform in ('linux', 'freebsd', 'darwin'):
 	default_drivers = 'softpipe,failover,svga,i915,i965,trace,identity,llvmpipe'
@@ -54,6 +55,28 @@ opts.Add(ListVariable('drivers', 'pipe drivers to build', default_drivers,
 opts.Add(ListVariable('winsys', 'winsys drivers to build', default_winsys,
                      ['xlib', 'vmware', 'i915', 'i965', 'gdi', 'radeon', 'graw-xlib']))
 
+opts.Add(ListVariable('targets', 'driver targets to build', default_targets,
+		      ['dri-i915',
+		       'dri-i965',
+		       'dri-nouveau',
+		       'dri-radeong',
+		       'dri-swrast',
+		       'dri-vmwgfx',
+		       'egl-i915',
+		       'egl-i965',
+		       'egl-nouveau',
+		       'egl-radeon',
+		       'egl-swrast',
+		       'egl-vmwgfx',
+		       'graw-xlib',
+		       'libgl-gdi',
+		       'libgl-xlib',
+		       'xorg-i915',
+		       'xorg-i965',
+		       'xorg-nouveau',
+		       'xorg-radeon',
+		       'xorg-vmwgfx']))
+
 opts.Add(EnumVariable('MSVS_VERSION', 'MS Visual C++ version', None, allowed_values=('7.1', '8.0', '9.0')))
 
 env = Environment(
diff --git a/src/gallium/targets/SConscript b/src/gallium/targets/SConscript
index ca3e1ec1327..9077cbf6a45 100644
--- a/src/gallium/targets/SConscript
+++ b/src/gallium/targets/SConscript
@@ -1,5 +1,8 @@
+import os
 Import('*')
 	
+# Compatibility with old build scripts:
+#
 if 'xlib' in env['winsys']:
 	SConscript([
 		'libgl-xlib/SConscript',
@@ -10,12 +13,7 @@ if 'gdi' in env['winsys']:
 		'libgl-gdi/SConscript',
 	])
 
-if env['platform'] == 'linux' and 'xlib' in env['winsys'] and 'graw-xlib' in env['winsys']:
-	SConscript([
-		'graw-xlib/SConscript',
-	])
-else:
-    if not env['msvc']:
+if not 'graw-xlib' in env['targets'] and not env['msvc']:
         # XXX: disable until MSVC can link correctly
         SConscript('graw-null/SConscript')
 
@@ -30,3 +28,13 @@ if 'xorg' in env['statetrackers']:
 		SConscript([
 			'xorg-vmwgfx/SConscript',
 		])
+
+# Ideally all non-target directories would produce convenience
+# libraries, and the actual shared libraries and other installables
+# would be finally assembled in the targets subtree:
+#
+for target in env['targets']:
+    SConscript(os.path.join(target, 'SConscript'))
+
+
+