scons: Put the tool logic in a frontend tool.
authorJosé Fonseca <jrfonseca@tungstengraphics.com>
Fri, 6 Jun 2008 05:48:57 +0000 (14:48 +0900)
committerJosé Fonseca <jrfonseca@tungstengraphics.com>
Fri, 6 Jun 2008 05:55:51 +0000 (14:55 +0900)
More logic can be shared between public and private branches this way.

SConstruct
common.py
scons/gallium.py [new file with mode: 0644]

index 8c8a82b38ec9725e7a0937bb487162066b5fdf40..4fddcc531ea438f0a9adc10f61eb00b8c5e6553c 100644 (file)
@@ -53,8 +53,12 @@ opts.Add(ListOption('winsys', 'winsys drivers to build', default_winsys,
 
 env = Environment(
        MSVS_VERSION = '7.1',
-       options = opts, 
-       ENV = os.environ)
+       options = opts,
+       tools = ['gallium'],
+       toolpath = ['scons'],   
+       ENV = os.environ,
+)
+
 Help(opts.GenerateHelpText(env))
 
 # replicate options values in local variables
@@ -82,25 +86,6 @@ Export([
 
 #######################################################################
 # Environment setup
-#
-# TODO: put the compiler specific settings in separate files
-# TODO: auto-detect as much as possible
-
-if platform == 'winddk':
-       env.Tool('winddk', ['scons'])
-       
-       env.Append(CPPPATH = [
-               env['SDK_INC_PATH'],
-               env['DDK_INC_PATH'],
-               env['WDM_INC_PATH'],
-               env['CRT_INC_PATH'],
-       ])
-
-if platform == 'wince':
-       env.Tool('evc', ['scons'])
-
-common.generate(env)
-
 
 # Includes
 env.Append(CPPPATH = [
@@ -111,13 +96,6 @@ env.Append(CPPPATH = [
 ])
 
 
-# x86 assembly
-if x86:
-       if gcc: 
-               env.Append(CFLAGS = '-m32')
-               env.Append(CXXFLAGS = '-m32')
-
-
 # Posix
 if platform in ('posix', 'linux', 'freebsd', 'darwin'):
        env.Append(CPPDEFINES = [
@@ -182,6 +160,6 @@ Export('env')
 
 SConscript(
        'src/SConscript',
-       build_dir = common.make_build_dir(env),
+       build_dir = env['build'],
        duplicate = 0 # http://www.scons.org/doc/0.97/HTML/scons-user/x2261.html
 )
index c82f3026ddbbe1bd93f2ee65267c1fca0c5d173c..dd64e0f434de0c6e9b8475cc174f95db43e0aa4e 100644 (file)
--- a/common.py
+++ b/common.py
@@ -62,283 +62,3 @@ def AddOptions(opts):
        opts.Add(BoolOption('llvm', 'use LLVM', 'no'))
        opts.Add(BoolOption('dri', 'build DRI drivers', default_dri))
 
-
-#######################################################################
-# Quiet command lines
-#
-# See also http://www.scons.org/wiki/HidingCommandLinesInOutput
-
-def quietCommandLines(env):
-       env['CCCOMSTR'] = "Compiling $SOURCE ..."
-       env['CXXCOMSTR'] = "Compiling $SOURCE ..."
-       env['ARCOMSTR'] = "Archiving $TARGET ..."
-       env['RANLIBCOMSTR'] = ""
-       env['LINKCOMSTR'] = "Linking $TARGET ..."
-
-
-#######################################################################
-# Convenience Library Builder
-# based on the stock StaticLibrary and SharedLibrary builders
-
-import SCons.Action
-import SCons.Builder
-
-def createConvenienceLibBuilder(env):
-    """This is a utility function that creates the ConvenienceLibrary
-    Builder in an Environment if it is not there already.
-
-    If it is already there, we return the existing one.
-    """
-
-    try:
-        convenience_lib = env['BUILDERS']['ConvenienceLibrary']
-    except KeyError:
-        action_list = [ SCons.Action.Action("$ARCOM", "$ARCOMSTR") ]
-        if env.Detect('ranlib'):
-            ranlib_action = SCons.Action.Action("$RANLIBCOM", "$RANLIBCOMSTR")
-            action_list.append(ranlib_action)
-
-        convenience_lib = SCons.Builder.Builder(action = action_list,
-                                  emitter = '$LIBEMITTER',
-                                  prefix = '$LIBPREFIX',
-                                  suffix = '$LIBSUFFIX',
-                                  src_suffix = '$SHOBJSUFFIX',
-                                  src_builder = 'SharedObject')
-        env['BUILDERS']['ConvenienceLibrary'] = convenience_lib
-        env['BUILDERS']['Library'] = convenience_lib
-
-    return convenience_lib
-
-
-#######################################################################
-# Build
-
-def make_build_dir(env):
-       # Put build output in a separate dir, which depends on the current configuration
-       # See also http://www.scons.org/wiki/AdvancedBuildExample
-       build_topdir = 'build'
-       build_subdir = env['platform']
-       if env['dri']:
-               build_subdir += "-dri"
-       if env['llvm']:
-               build_subdir += "-llvm"
-       if env['machine'] != 'generic':
-               build_subdir += '-' + env['machine']
-       if env['debug']:
-               build_subdir += "-debug"
-       if env['profile']:
-               build_subdir += "-profile"
-       build_dir = os.path.join(build_topdir, build_subdir)
-       # Place the .sconsign file on the builddir too, to avoid issues with different scons
-       # versions building the same source file
-       env.SConsignFile(os.path.join(build_dir, '.sconsign'))
-       return build_dir
-
-
-#######################################################################
-# Common environment generation code
-
-def generate(env):
-       # FIXME: this is already too late
-       #if env.get('quiet', False):
-       #       quietCommandLines(env)
-       
-       # shortcuts
-       debug = env['debug']
-       machine = env['machine']
-       platform = env['platform']
-       x86 = env['machine'] == 'x86'
-       gcc = env['platform'] in ('linux', 'freebsd', 'darwin')
-       msvc = env['platform'] in ('windows', 'winddk', 'wince')
-
-       # C preprocessor options
-       cppdefines = []
-       if debug:
-               cppdefines += ['DEBUG']
-       else:
-               cppdefines += ['NDEBUG']
-       if env['profile']:
-               cppdefines += ['PROFILE']
-       if platform == 'windows':
-               cppdefines += [
-                       'WIN32', 
-                       '_WINDOWS', 
-                       '_UNICODE',
-                       'UNICODE',
-                       # http://msdn2.microsoft.com/en-us/library/6dwk3a1z.aspx,
-                       'WIN32_LEAN_AND_MEAN',
-                       'VC_EXTRALEAN', 
-                       '_CRT_SECURE_NO_DEPRECATE',
-               ]
-               if debug:
-                       cppdefines += ['_DEBUG']
-       if platform == 'winddk':
-               # Mimic WINDDK's builtin flags. See also:
-               # - WINDDK's bin/makefile.new i386mk.inc for more info.
-               # - buildchk_wxp_x86.log files, generated by the WINDDK's build
-               # - http://alter.org.ua/docs/nt_kernel/vc8_proj/
-               cppdefines += [
-                       ('_X86_', '1'), 
-                       ('i386', '1'), 
-                       'STD_CALL', 
-                       ('CONDITION_HANDLING', '1'),
-                       ('NT_INST', '0'), 
-                       ('WIN32', '100'),
-                       ('_NT1X_', '100'),
-                       ('WINNT', '1'),
-                       ('_WIN32_WINNT', '0x0501'), # minimum required OS version
-                       ('WINVER', '0x0501'),
-                       ('_WIN32_IE', '0x0603'),
-                       ('WIN32_LEAN_AND_MEAN', '1'),
-                       ('DEVL', '1'),
-                       ('__BUILDMACHINE__', 'WinDDK'),
-                       ('FPO', '0'),
-               ]
-               if debug:
-                       cppdefines += [('DBG', 1)]
-       if platform == 'wince':
-               cppdefines += [
-                       ('_WIN32_WCE', '500'), 
-                       'WCE_PLATFORM_STANDARDSDK_500',
-                       '_i386_',
-                       ('UNDER_CE', '500'),
-                       'UNICODE',
-                       '_UNICODE',
-                       '_X86_',
-                       'x86',
-                       '_USRDLL',
-                       'TEST_EXPORTS' ,
-               ]
-       if platform == 'windows':
-               cppdefines += ['PIPE_SUBSYSTEM_WINDOWS_USER']
-       if platform == 'winddk':
-               cppdefines += ['PIPE_SUBSYSTEM_WINDOWS_DISPLAY']
-       if platform == 'wince':
-               cppdefines += ['PIPE_SUBSYSTEM_WINDOWS_CE']
-       env.Append(CPPDEFINES = cppdefines)
-
-       # C compiler options
-       cflags = []
-       if gcc:
-               if debug:
-                       cflags += ['-O0', '-g3']
-               else:
-                       cflags += ['-O3', '-g3']
-               if env['profile']:
-                       cflags += ['-pg']
-               if env['machine'] == 'x86' and default_machine == 'x86_64':
-                       cflags += ['-m32']
-               if env['machine'] == 'x86_64' and default_machine == 'x86':
-                       cflags += ['-m64']
-               cflags += [
-                       '-Wall', 
-                       '-Wmissing-prototypes',
-                       '-Wno-long-long',
-                       '-ffast-math',
-                       '-pedantic',
-                       '-fmessage-length=0', # be nice to Eclipse 
-               ]
-       if msvc:
-               # See also:
-               # - http://msdn2.microsoft.com/en-us/library/y0zzbyt4.aspx
-               # - cl /?
-               if debug:
-                       cflags += [
-                         '/Od', # disable optimizations
-                         '/Oi', # enable intrinsic functions
-                         '/Oy-', # disable frame pointer omission
-                       ]
-               else:
-                       cflags += [
-                         '/Ox', # maximum optimizations
-                         '/Oi', # enable intrinsic functions
-                         '/Os', # favor code space
-                       ]
-               if env['profile']:
-                       cflags += [
-                               '/Gh', # enable _penter hook function
-                               '/GH', # enable _pexit hook function
-                       ]
-               cflags += [
-                       '/W3', # warning level
-                       #'/Wp64', # enable 64 bit porting warnings
-               ]
-               if platform == 'windows':
-                       cflags += [
-                               # TODO
-                       ]
-               if platform == 'winddk':
-                       cflags += [
-                               '/Zl', # omit default library name in .OBJ
-                               '/Zp8', # 8bytes struct member alignment
-                               '/Gy', # separate functions for linker
-                               '/Gm-', # disable minimal rebuild
-                               '/WX', # treat warnings as errors
-                               '/Gz', # __stdcall Calling convention
-                               '/GX-', # disable C++ EH
-                               '/GR-', # disable C++ RTTI
-                               '/GF', # enable read-only string pooling
-                               '/G6', # optimize for PPro, P-II, P-III
-                               '/Ze', # enable extensions
-                               '/Gi-', # disable incremental compilation
-                               '/QIfdiv-', # disable Pentium FDIV fix
-                               '/hotpatch', # prepares an image for hotpatching.
-                               #'/Z7', #enable old-style debug info
-                       ]
-               if platform == 'wince':
-                       cflags += [
-                               '/Gs8192',
-                               '/GF', # enable read-only string pooling
-                       ]
-               # Put debugging information in a separate .pdb file for each object file as
-               # described in the scons manpage
-               env['CCPDBFLAGS'] = '/Zi /Fd${TARGET}.pdb'
-       env.Append(CFLAGS = cflags)
-       env.Append(CXXFLAGS = cflags)
-
-       # Linker options
-       linkflags = []
-       if gcc:
-               if env['machine'] == 'x86' and default_machine == 'x86_64':
-                       linkflags += ['-m32']
-               if env['machine'] == 'x86_64' and default_machine == 'x86':
-                       linkflags += ['-m64']
-       if platform == 'winddk':
-               # See also:
-               # - http://msdn2.microsoft.com/en-us/library/y0zzbyt4.aspx
-               linkflags += [
-                       '/merge:_PAGE=PAGE',
-                       '/merge:_TEXT=.text',
-                       '/section:INIT,d',
-                       '/opt:ref',
-                       '/opt:icf',
-                       '/ignore:4198,4010,4037,4039,4065,4070,4078,4087,4089,4221',
-                       '/incremental:no',
-                       '/fullbuild',
-                       '/release',
-                       '/nodefaultlib',
-                       '/wx',
-                       '/debug',
-                       '/debugtype:cv',
-                       '/version:5.1',
-                       '/osversion:5.1',
-                       '/functionpadmin:5',
-                       '/safeseh',
-                       '/pdbcompress',
-                       '/stack:0x40000,0x1000',
-                       '/driver', 
-                       '/align:0x80',
-                       '/subsystem:native,5.01',
-                       '/base:0x10000',
-                       
-                       '/entry:DrvEnableDriver',
-               ]
-       env.Append(LINKFLAGS = linkflags)
-
-
-       createConvenienceLibBuilder(env)
-       
-       
-       # for debugging
-       #print env.Dump()
-
diff --git a/scons/gallium.py b/scons/gallium.py
new file mode 100644 (file)
index 0000000..1787adb
--- /dev/null
@@ -0,0 +1,323 @@
+"""gallium
+
+Frontend-tool for Gallium3D architecture.
+
+"""
+
+# 
+# Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
+# All Rights Reserved.
+# 
+# Permission is hereby granted, free of charge, to any person obtaining a
+# copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sub license, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+# 
+# The above copyright notice and this permission notice (including the
+# next paragraph) shall be included in all copies or substantial portions
+# of the Software.
+# 
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+# IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
+# ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+# 
+
+
+import os.path
+
+import SCons.Action
+import SCons.Builder
+
+
+def quietCommandLines(env):
+       # Quiet command lines
+       # See also http://www.scons.org/wiki/HidingCommandLinesInOutput
+       env['CCCOMSTR'] = "Compiling $SOURCE ..."
+       env['CXXCOMSTR'] = "Compiling $SOURCE ..."
+       env['ARCOMSTR'] = "Archiving $TARGET ..."
+       env['RANLIBCOMSTR'] = ""
+       env['LINKCOMSTR'] = "Linking $TARGET ..."
+
+
+def createConvenienceLibBuilder(env):
+    """This is a utility function that creates the ConvenienceLibrary
+    Builder in an Environment if it is not there already.
+
+    If it is already there, we return the existing one.
+    
+    Based on the stock StaticLibrary and SharedLibrary builders.
+    """
+
+    try:
+        convenience_lib = env['BUILDERS']['ConvenienceLibrary']
+    except KeyError:
+        action_list = [ SCons.Action.Action("$ARCOM", "$ARCOMSTR") ]
+        if env.Detect('ranlib'):
+            ranlib_action = SCons.Action.Action("$RANLIBCOM", "$RANLIBCOMSTR")
+            action_list.append(ranlib_action)
+
+        convenience_lib = SCons.Builder.Builder(action = action_list,
+                                  emitter = '$LIBEMITTER',
+                                  prefix = '$LIBPREFIX',
+                                  suffix = '$LIBSUFFIX',
+                                  src_suffix = '$SHOBJSUFFIX',
+                                  src_builder = 'SharedObject')
+        env['BUILDERS']['ConvenienceLibrary'] = convenience_lib
+        env['BUILDERS']['Library'] = convenience_lib
+
+    return convenience_lib
+
+
+def generate(env):
+       """Common environment generation code"""
+       
+       # FIXME: this is already too late
+       #if env.get('quiet', False):
+       #       quietCommandLines(env)
+       
+       # shortcuts
+       debug = env['debug']
+       machine = env['machine']
+       platform = env['platform']
+       x86 = env['machine'] == 'x86'
+       gcc = env['platform'] in ('linux', 'freebsd', 'darwin')
+       msvc = env['platform'] in ('windows', 'winddk', 'wince')
+
+       # Tool
+       if platform == 'winddk':
+               env.Tool('winddk')
+       elif platform == 'wince':
+               env.Tool('evc')
+       else:
+               env.Tool('default')
+
+       # Put build output in a separate dir, which depends on the current 
+       # configuration. See also http://www.scons.org/wiki/AdvancedBuildExample
+       build_topdir = 'build'
+       build_subdir = env['platform']
+       if env['dri']:
+               build_subdir += "-dri"
+       if env['llvm']:
+               build_subdir += "-llvm"
+       if env['machine'] != 'generic':
+               build_subdir += '-' + env['machine']
+       if env['debug']:
+               build_subdir += "-debug"
+       if env['profile']:
+               build_subdir += "-profile"
+       build_dir = os.path.join(build_topdir, build_subdir)
+       # Place the .sconsign file in the build dir too, to avoid issues with 
+       # different scons versions building the same source file
+       env['build'] = build_dir
+       env.SConsignFile(os.path.join(build_dir, '.sconsign'))
+
+       # C preprocessor options
+       cppdefines = []
+       if debug:
+               cppdefines += ['DEBUG']
+       else:
+               cppdefines += ['NDEBUG']
+       if env['profile']:
+               cppdefines += ['PROFILE']
+       if platform == 'windows':
+               cppdefines += [
+                       'WIN32', 
+                       '_WINDOWS', 
+                       '_UNICODE',
+                       'UNICODE',
+                       # http://msdn2.microsoft.com/en-us/library/6dwk3a1z.aspx,
+                       'WIN32_LEAN_AND_MEAN',
+                       'VC_EXTRALEAN', 
+                       '_CRT_SECURE_NO_DEPRECATE',
+               ]
+               if debug:
+                       cppdefines += ['_DEBUG']
+       if platform == 'winddk':
+               # Mimic WINDDK's builtin flags. See also:
+               # - WINDDK's bin/makefile.new i386mk.inc for more info.
+               # - buildchk_wxp_x86.log files, generated by the WINDDK's build
+               # - http://alter.org.ua/docs/nt_kernel/vc8_proj/
+               cppdefines += [
+                       ('_X86_', '1'), 
+                       ('i386', '1'), 
+                       'STD_CALL', 
+                       ('CONDITION_HANDLING', '1'),
+                       ('NT_INST', '0'), 
+                       ('WIN32', '100'),
+                       ('_NT1X_', '100'),
+                       ('WINNT', '1'),
+                       ('_WIN32_WINNT', '0x0501'), # minimum required OS version
+                       ('WINVER', '0x0501'),
+                       ('_WIN32_IE', '0x0603'),
+                       ('WIN32_LEAN_AND_MEAN', '1'),
+                       ('DEVL', '1'),
+                       ('__BUILDMACHINE__', 'WinDDK'),
+                       ('FPO', '0'),
+               ]
+               if debug:
+                       cppdefines += [('DBG', 1)]
+       if platform == 'wince':
+               cppdefines += [
+                       ('_WIN32_WCE', '500'), 
+                       'WCE_PLATFORM_STANDARDSDK_500',
+                       '_i386_',
+                       ('UNDER_CE', '500'),
+                       'UNICODE',
+                       '_UNICODE',
+                       '_X86_',
+                       'x86',
+                       '_USRDLL',
+                       'TEST_EXPORTS' ,
+               ]
+       if platform == 'windows':
+               cppdefines += ['PIPE_SUBSYSTEM_WINDOWS_USER']
+       if platform == 'winddk':
+               cppdefines += ['PIPE_SUBSYSTEM_WINDOWS_DISPLAY']
+       if platform == 'wince':
+               cppdefines += ['PIPE_SUBSYSTEM_WINDOWS_CE']
+       env.Append(CPPDEFINES = cppdefines)
+
+       # C preprocessor includes
+       if platform == 'winddk':
+               env.Append(CPPPATH = [
+                       env['SDK_INC_PATH'],
+                       env['DDK_INC_PATH'],
+                       env['WDM_INC_PATH'],
+                       env['CRT_INC_PATH'],
+               ])
+
+       # C compiler options
+       cflags = []
+       if gcc:
+               if debug:
+                       cflags += ['-O0', '-g3']
+               else:
+                       cflags += ['-O3', '-g3']
+               if env['profile']:
+                       cflags += ['-pg']
+               if env['machine'] == 'x86':
+                       cflags += ['-m32']
+               if env['machine'] == 'x86_64':
+                       cflags += ['-m64']
+               cflags += [
+                       '-Wall', 
+                       '-Wmissing-prototypes',
+                       '-Wno-long-long',
+                       '-ffast-math',
+                       '-pedantic',
+                       '-fmessage-length=0', # be nice to Eclipse 
+               ]
+       if msvc:
+               # See also:
+               # - http://msdn2.microsoft.com/en-us/library/y0zzbyt4.aspx
+               # - cl /?
+               if debug:
+                       cflags += [
+                         '/Od', # disable optimizations
+                         '/Oi', # enable intrinsic functions
+                         '/Oy-', # disable frame pointer omission
+                       ]
+               else:
+                       cflags += [
+                         '/Ox', # maximum optimizations
+                         '/Oi', # enable intrinsic functions
+                         '/Os', # favor code space
+                       ]
+               if env['profile']:
+                       cflags += [
+                               '/Gh', # enable _penter hook function
+                               '/GH', # enable _pexit hook function
+                       ]
+               cflags += [
+                       '/W3', # warning level
+                       #'/Wp64', # enable 64 bit porting warnings
+               ]
+               if platform == 'windows':
+                       cflags += [
+                               # TODO
+                       ]
+               if platform == 'winddk':
+                       cflags += [
+                               '/Zl', # omit default library name in .OBJ
+                               '/Zp8', # 8bytes struct member alignment
+                               '/Gy', # separate functions for linker
+                               '/Gm-', # disable minimal rebuild
+                               '/WX', # treat warnings as errors
+                               '/Gz', # __stdcall Calling convention
+                               '/GX-', # disable C++ EH
+                               '/GR-', # disable C++ RTTI
+                               '/GF', # enable read-only string pooling
+                               '/G6', # optimize for PPro, P-II, P-III
+                               '/Ze', # enable extensions
+                               '/Gi-', # disable incremental compilation
+                               '/QIfdiv-', # disable Pentium FDIV fix
+                               '/hotpatch', # prepares an image for hotpatching.
+                               #'/Z7', #enable old-style debug info
+                       ]
+               if platform == 'wince':
+                       cflags += [
+                               '/Gs8192',
+                               '/GF', # enable read-only string pooling
+                       ]
+               # Automatic pdb generation
+               # See http://scons.tigris.org/issues/show_bug.cgi?id=1656
+               env.EnsureSConsVersion(0, 98, 0)
+               env['PDB'] = '${TARGET.base}.pdb'
+       env.Append(CFLAGS = cflags)
+       env.Append(CXXFLAGS = cflags)
+
+       # Linker options
+       linkflags = []
+       if gcc:
+               if env['machine'] == 'x86':
+                       linkflags += ['-m32']
+               if env['machine'] == 'x86_64':
+                       linkflags += ['-m64']
+       if platform == 'winddk':
+               # See also:
+               # - http://msdn2.microsoft.com/en-us/library/y0zzbyt4.aspx
+               linkflags += [
+                       '/merge:_PAGE=PAGE',
+                       '/merge:_TEXT=.text',
+                       '/section:INIT,d',
+                       '/opt:ref',
+                       '/opt:icf',
+                       '/ignore:4198,4010,4037,4039,4065,4070,4078,4087,4089,4221',
+                       '/incremental:no',
+                       '/fullbuild',
+                       '/release',
+                       '/nodefaultlib',
+                       '/wx',
+                       '/debug',
+                       '/debugtype:cv',
+                       '/version:5.1',
+                       '/osversion:5.1',
+                       '/functionpadmin:5',
+                       '/safeseh',
+                       '/pdbcompress',
+                       '/stack:0x40000,0x1000',
+                       '/driver', 
+                       '/align:0x80',
+                       '/subsystem:native,5.01',
+                       '/base:0x10000',
+                       
+                       '/entry:DrvEnableDriver',
+               ]
+       env.Append(LINKFLAGS = linkflags)
+
+       # Convenience Library Builder
+       createConvenienceLibBuilder(env)
+       
+       # for debugging
+       #print env.Dump()
+
+
+def exists(env):
+       return 1