scons: Output a meaningful message when xlib libGL.so can't be built.

diff --git a/src/gallium/winsys/xlib/SConscript b/src/gallium/winsys/xlib/SConscript
index 713841aeb1b6cb40e4450defa120b1152ab017a0..cdc31d22a21f93f1cc5e460817485fca980a2bda 100644 (file)
--- a/src/gallium/winsys/xlib/SConscript
+++ b/src/gallium/winsys/xlib/SConscript
@@ -3,50 +3,62 @@
 
 Import('*')
 
-if env['platform'] == 'linux' \
-        and 'mesa' in env['statetrackers'] \
-        and set(('softpipe', 'llvmpipe', 'i915', 'trace')).intersection(env['drivers']) \
-        and not env['dri']:
-
-    env = env.Clone()
-
-    env.Append(CPPPATH = [
-        '#/src/mesa',
-        '#/src/mesa/main',
-        '#src/gallium/state_trackers/glx/xlib',
-    ])
-
-    env.Append(CPPDEFINES = ['USE_XSHM'])
-
-    sources = [
-        'xlib.c',
-    ]
-
-    drivers = [trace]
-        
-    if 'softpipe' in env['drivers']:
-        env.Append(CPPDEFINES = 'GALLIUM_SOFTPIPE')
-        sources += ['xlib_softpipe.c']
-        drivers += [softpipe]
-
-    if 'llvmpipe' in env['drivers']:
-        env.Tool('llvm')
-        if 'LLVM_VERSION' in env:
-            env.Append(CPPDEFINES = 'GALLIUM_LLVMPIPE')
-            env.Tool('udis86')
-            sources += ['xlib_llvmpipe.c']
-            drivers += [llvmpipe]
-        
-    if 'cell' in env['drivers']:
-        env.Append(CPPDEFINES = 'GALLIUM_CELL')
-        sources += ['xlib_cell.c']
-        drivers += [cell]
-
-    # TODO: write a wrapper function http://www.scons.org/wiki/WrapperFunctions
-    libgl = env.SharedLibrary(
-        target ='GL',
-        source = sources,
-        LIBS = st_xlib + glapi + mesa + glsl + drivers + gallium + env['LIBS'],
-    )
+if env['platform'] != 'linux':
+    Return()
 
+if 'mesa' not in env['statetrackers']:
+    print 'warning: Mesa state tracker disabled: skipping build of xlib libGL.so'
+    Return()
+
+if 'trace' not in env['drivers']:
+    print 'warning: trace pipe driver disabled: skipping build of xlib libGL.so'
+    Return()
+
+if not set(('softpipe', 'llvmpipe', 'trace')).intersection(env['drivers']):
+    print 'warning: no supported pipe driver: skipping build of xlib libGL.so'
+    Return()
+
+env = env.Clone()
+
+env.Append(CPPPATH = [
+    '#/src/mesa',
+    '#/src/mesa/main',
+    '#src/gallium/state_trackers/glx/xlib',
+])
+
+env.Append(CPPDEFINES = ['USE_XSHM'])
+
+sources = [
+    'xlib.c',
+]
+
+drivers = [trace]
+    
+if 'softpipe' in env['drivers']:
+    env.Append(CPPDEFINES = 'GALLIUM_SOFTPIPE')
+    sources += ['xlib_softpipe.c']
+    drivers += [softpipe]
+
+if 'llvmpipe' in env['drivers']:
+    env.Tool('llvm')
+    if 'LLVM_VERSION' in env:
+        env.Append(CPPDEFINES = 'GALLIUM_LLVMPIPE')
+        env.Tool('udis86')
+        sources += ['xlib_llvmpipe.c']
+        drivers += [llvmpipe]
+    
+if 'cell' in env['drivers']:
+    env.Append(CPPDEFINES = 'GALLIUM_CELL')
+    sources += ['xlib_cell.c']
+    drivers += [cell]
+
+# TODO: write a wrapper function http://www.scons.org/wiki/WrapperFunctions
+libgl = env.SharedLibrary(
+    target ='GL',
+    source = sources,
+    LIBS = st_xlib + glapi + mesa + glsl + drivers + gallium + env['LIBS'],
+)
+
+if not env['dri']:
+    # Only install this libGL.so if DRI not enabled
     env.InstallSharedLibrary(libgl, version=(1, 5))