text: """llvm
  
  Tool-specific initialization for LLVM
  
  """
  
  #
  # Copyright (c) 2009 VMware, Inc.
  #
  # 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, sublicense, 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 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
  # NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 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
  import os.path
  import re
  import sys
  import distutils.version
  
  import SCons.Errors
  import SCons.Util
  
  
  def generate(env):
      env['llvm'] = False
  
      try:
          llvm_dir = os.environ['LLVM']
      except KeyError:
          # Do nothing -- use the system headers/libs
          llvm_dir = None
      else:
          if not os.path.isdir(llvm_dir):
              raise SCons.Errors.InternalError, "Specified LLVM directory not found"
  
          if env['debug']:
              llvm_subdir = 'Debug'
          else:
              llvm_subdir = 'Release'
  
          llvm_bin_dir = os.path.join(llvm_dir, llvm_subdir, 'bin')
          if not os.path.isdir(llvm_bin_dir):
              llvm_bin_dir = os.path.join(llvm_dir, 'bin')
              if not os.path.isdir(llvm_bin_dir):
                  raise SCons.Errors.InternalError, "LLVM binary directory not found"
  
          env.PrependENVPath('PATH', llvm_bin_dir)
  
      if env['platform'] == 'windows':
          # XXX: There is no llvm-config on Windows, so assume a standard layout
          if llvm_dir is None:
              print 'scons: LLVM environment variable must be specified when building for windows'
              return
  
          # Try to determine the LLVM version from llvm/Config/config.h
          llvm_config = os.path.join(llvm_dir, 'include/llvm/Config/config.h')
          if not os.path.exists(llvm_config):
              print 'scons: could not find %s' % llvm_config
              return
          llvm_version_re = re.compile(r'^#define PACKAGE_VERSION "([^"]*)"')
          llvm_version = None
          for line in open(llvm_config, 'rt'):
              mo = llvm_version_re.match(line)
              if mo:
                  llvm_version = mo.group(1)
                  llvm_version = distutils.version.LooseVersion(llvm_version)
                  break
          if llvm_version is None:
              print 'scons: could not determine the LLVM version from %s' % llvm_config
              return
  
          env.Prepend(CPPPATH = [os.path.join(llvm_dir, 'include')])
          env.AppendUnique(CPPDEFINES = [
              '__STDC_LIMIT_MACROS', 
              '__STDC_CONSTANT_MACROS',
              'HAVE_STDINT_H',
          ])
          env.Prepend(LIBPATH = [os.path.join(llvm_dir, 'lib')])
          if llvm_version >= distutils.version.LooseVersion('2.9'):
              # 2.9
              env.Prepend(LIBS = [
                  'LLVMObject', 'LLVMMCJIT', 'LLVMMCDisassembler',
                  'LLVMLinker', 'LLVMipo', 'LLVMInterpreter',
                  'LLVMInstrumentation', 'LLVMJIT', 'LLVMExecutionEngine',
                  'LLVMBitWriter', 'LLVMX86Disassembler', 'LLVMX86AsmParser',
                  'LLVMMCParser', 'LLVMX86AsmPrinter', 'LLVMX86CodeGen',
                  'LLVMSelectionDAG', 'LLVMX86Utils', 'LLVMX86Info', 'LLVMAsmPrinter',
                  'LLVMCodeGen', 'LLVMScalarOpts', 'LLVMInstCombine',
                  'LLVMTransformUtils', 'LLVMipa', 'LLVMAsmParser',
                  'LLVMArchive', 'LLVMBitReader', 'LLVMAnalysis', 'LLVMTarget',
                  'LLVMCore', 'LLVMMC', 'LLVMSupport',
              ])
          elif llvm_version >= distutils.version.LooseVersion('2.7'):
              # 2.7
              env.Prepend(LIBS = [
                  'LLVMLinker', 'LLVMipo', 'LLVMInterpreter',
                  'LLVMInstrumentation', 'LLVMJIT', 'LLVMExecutionEngine',
                  'LLVMBitWriter', 'LLVMX86Disassembler', 'LLVMX86AsmParser',
                  'LLVMMCParser', 'LLVMX86AsmPrinter', 'LLVMX86CodeGen',
                  'LLVMSelectionDAG', 'LLVMX86Info', 'LLVMAsmPrinter',
                  'LLVMCodeGen', 'LLVMScalarOpts', 'LLVMInstCombine',
                  'LLVMTransformUtils', 'LLVMipa', 'LLVMAsmParser',
                  'LLVMArchive', 'LLVMBitReader', 'LLVMAnalysis', 'LLVMTarget',
                  'LLVMMC', 'LLVMCore', 'LLVMSupport', 'LLVMSystem',
              ])
          else:
              # 2.6
              env.Prepend(LIBS = [
                  'LLVMX86AsmParser', 'LLVMX86AsmPrinter', 'LLVMX86CodeGen',
                  'LLVMX86Info', 'LLVMLinker', 'LLVMipo', 'LLVMInterpreter',
                  'LLVMInstrumentation', 'LLVMJIT', 'LLVMExecutionEngine',
                  'LLVMDebugger', 'LLVMBitWriter', 'LLVMAsmParser',
                  'LLVMArchive', 'LLVMBitReader', 'LLVMSelectionDAG',
                  'LLVMAsmPrinter', 'LLVMCodeGen', 'LLVMScalarOpts',
                  'LLVMTransformUtils', 'LLVMipa', 'LLVMAnalysis',
                  'LLVMTarget', 'LLVMMC', 'LLVMCore', 'LLVMSupport',
                  'LLVMSystem',
              ])
          env.Append(LIBS = [
              'imagehlp',
              'psapi',
              'shell32',
              'advapi32'
          ])
          if env['msvc']:
              # Some of the LLVM C headers use the inline keyword without
              # defining it.
              env.Append(CPPDEFINES = [('inline', '__inline')])
              if env['build'] in ('debug', 'checked'):
                  # LLVM libraries are static, build with /MT, and they
                  # automatically link agains LIBCMT. When we're doing a
                  # debug build we'll be linking against LIBCMTD, so disable
                  # that.
                  env.Append(LINKFLAGS = ['/nodefaultlib:LIBCMT'])
      else:
          if not env.Detect('llvm-config'):
              print 'scons: llvm-config script not found' % llvm_version
              return
  
          llvm_version = env.backtick('llvm-config --version').rstrip()
          llvm_version = distutils.version.LooseVersion(llvm_version)
  
          try:
              # Treat --cppflags specially to prevent NDEBUG from disabling
              # assertion failures in debug builds.
              cppflags = env.ParseFlags('!llvm-config --cppflags')
              try:
                  cppflags['CPPDEFINES'].remove('NDEBUG')
              except ValueError:
                  pass
              env.MergeFlags(cppflags)
  
              env.ParseConfig('llvm-config --libs')
              env.ParseConfig('llvm-config --ldflags')
          except OSError:
              print 'scons: llvm-config version %s failed' % llvm_version
              return
  
      assert llvm_version is not None
      env['llvm'] = True
  
      print 'scons: Found LLVM version %s' % llvm_version
      env['LLVM_VERSION'] = llvm_version
  
      # Define HAVE_LLVM macro with the major/minor version number (e.g., 0x0206 for 2.6)
      llvm_version_major = int(llvm_version.version[0])
      llvm_version_minor = int(llvm_version.version[1])
      llvm_version_hex = '0x%02x%02x' % (llvm_version_major, llvm_version_minor)
      env.Prepend(CPPDEFINES = [('HAVE_LLVM', llvm_version_hex)])
  
  def exists(env):
      return True
  
  # vim:set ts=4 sw=4 et:
  