scons: Fix build when rtti is disabled

* The rtti fix actually dug up a bug in the scons build scripts.
* Autotools took the LLVM cpp and cxx flags, while scons only took
  the cpp flags.
* This grabs the cxx flags and applies them where needed. We may
  want to make the same change for the llvm cpp flags in scons.
* The only linux platform I can find with LLVM no-rtti is Ubuntu.
* Fixes bug #70471

Tested-by: Vinson Lee <vlee@freedesktop.org>

scons/llvm.py

@@ -190,6 +190,9 @@ def generate(env):
                 pass
             env.MergeFlags(cppflags)
 
+            cxxflags = env.backtick('llvm-config --cxxflags').rstrip()
+            env.Append(LLVM_CXXFLAGS = cxxflags)
+
             components = ['engine', 'bitwriter', 'x86asmprinter']
 
             if llvm_version >= distutils.version.LooseVersion('3.1'):

src/gallium/auxiliary/SConscript

@@ -46,6 +46,8 @@ source = env.ParseSourceList('Makefile.sources', [
 ])
 
 if env['llvm']:
+    env.Append(CXXFLAGS = env['LLVM_CXXFLAGS'])
+
     source += env.ParseSourceList('Makefile.sources', [
         'GALLIVM_SOURCES',
         'GALLIVM_CPP_SOURCES'

src/gallium/drivers/llvmpipe/SConscript

@@ -10,13 +10,14 @@ if not env['llvm']:
 env = env.Clone()
 
 llvmpipe = env.ConvenienceLibrary(
-	target = 'llvmpipe',
-	source = env.ParseSourceList('Makefile.sources', 'C_SOURCES')
-	)
+    target = 'llvmpipe',
+    source = env.ParseSourceList('Makefile.sources', 'C_SOURCES')
+)
+
+env.Append(CXXFLAGS = env['LLVM_CXXFLAGS'])
 
 env.Alias('llvmpipe', llvmpipe)
 
-
 if not env['embedded']:
     env = env.Clone()