Mesa (master): scons: don't assume llvm is always present

[Zack Rusin]

Module: Mesa
Branch: master
Commit: 43f8a82a76599c10fa33ef35b6500924768de90c
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=43f8a82a76599c10fa33ef35b6500924768de90c

Author: Zack Rusin <zackr at vmware.com>
Date:   Tue Feb  9 00:00:35 2010 -0500

scons: don't assume llvm is always present

---

 SConstruct |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/SConstruct b/SConstruct
index 76ab902..fa67d14 100644
--- a/SConstruct
+++ b/SConstruct
@@ -170,8 +170,11 @@ if dri:
 if drawllvm:
 	# See also http://www.scons.org/wiki/UsingPkgConfig
         # currently  --ldflags --libsdisabled since the driver will force the correct linkage
-	env.ParseConfig('llvm-config --cflags backend bitreader engine instrumentation interpreter ipo')
-	env.Append(CPPDEFINES = ['DRAW_LLVM'])
+        env.Tool('llvm')
+        if not env.has_key('LLVM_VERSION'):
+           drawllvm = False
+	else:
+           env.Append(CPPDEFINES = ['DRAW_LLVM'])
 
 # libGL
 if platform in ('linux', 'freebsd', 'darwin'):