scons/llvm.py

   1 """llvm
   2
   3 Tool-specific initialization for LLVM
   4
   5 """
   6
   7 #
   8 # Copyright (c) 2009 VMware, Inc.
   9 #
  10 # Permission is hereby granted, free of charge, to any person obtaining
  11 # a copy of this software and associated documentation files (the
  12 # "Software"), to deal in the Software without restriction, including
  13 # without limitation the rights to use, copy, modify, merge, publish,
  14 # distribute, sublicense, and/or sell copies of the Software, and to
  15 # permit persons to whom the Software is furnished to do so, subject to
  16 # the following conditions:
  17 #
  18 # The above copyright notice and this permission notice shall be included
  19 # in all copies or substantial portions of the Software.
  20 #
  21 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
  22 # KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
  23 # WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  24 # NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  25 # LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  26 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  27 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  28 #
  29
  30 import os
  31 import os.path
  32 import re
  33 import sys
  34 import distutils.version
  35
  36 import SCons.Errors
  37 import SCons.Util
  38
  39
  40 required_llvm_version = '3.3'
  41
  42
  43 def generate(env):
  44     env['llvm'] = False
  45
  46     try:
  47         llvm_dir = os.environ['LLVM']
  48     except KeyError:
  49         # Do nothing -- use the system headers/libs
  50         llvm_dir = None
  51     else:
  52         if not os.path.isdir(llvm_dir):
  53             raise SCons.Errors.InternalError, "Specified LLVM directory not found"
  54
  55         if env['debug']:
  56             llvm_subdir = 'Debug'
  57         else:
  58             llvm_subdir = 'Release'
  59
  60         llvm_bin_dir = os.path.join(llvm_dir, llvm_subdir, 'bin')
  61         if not os.path.isdir(llvm_bin_dir):
  62             llvm_bin_dir = os.path.join(llvm_dir, 'bin')
  63             if not os.path.isdir(llvm_bin_dir):
  64                 raise SCons.Errors.InternalError, "LLVM binary directory not found"
  65
  66         env.PrependENVPath('PATH', llvm_bin_dir)
  67
  68     if env['platform'] == 'windows':
  69         # XXX: There is no llvm-config on Windows, so assume a standard layout
  70         if llvm_dir is None:
  71             print 'scons: LLVM environment variable must be specified when building for windows'
  72             return
  73
  74         # Try to determine the LLVM version from llvm/Config/config.h
  75         llvm_config = os.path.join(llvm_dir, 'include/llvm/Config/config.h')
  76         if not os.path.exists(llvm_config):
  77             print 'scons: could not find %s' % llvm_config
  78             return
  79         llvm_version_re = re.compile(r'^#define PACKAGE_VERSION "([^"]*)"')
  80         llvm_version = None
  81         for line in open(llvm_config, 'rt'):
  82             mo = llvm_version_re.match(line)
  83             if mo:
  84                 llvm_version = mo.group(1)
  85                 llvm_version = distutils.version.LooseVersion(llvm_version)
  86                 break
  87         if llvm_version is None:
  88             print 'scons: could not determine the LLVM version from %s' % llvm_config
  89             return
  90         if llvm_version < distutils.version.LooseVersion(required_llvm_version):
  91             print 'scons: LLVM version %s found, but %s is required' % (llvm_version, required_llvm_version)
  92             return
  93
  94         env.Prepend(CPPPATH = [os.path.join(llvm_dir, 'include')])
  95         env.AppendUnique(CPPDEFINES = [
  96             '__STDC_LIMIT_MACROS',
  97             '__STDC_CONSTANT_MACROS',
  98             'HAVE_STDINT_H',
  99         ])
 100         env.Prepend(LIBPATH = [os.path.join(llvm_dir, 'lib')])
 101         # LIBS should match the output of `llvm-config --libs engine mcjit bitwriter x86asmprinter`
 102         if llvm_version >= distutils.version.LooseVersion('3.5'):
 103             env.Prepend(LIBS = [
 104                 'LLVMBitWriter', 'LLVMMCJIT', 'LLVMRuntimeDyld',
 105                 'LLVMX86Disassembler', 'LLVMX86AsmParser', 'LLVMX86CodeGen',
 106                 'LLVMSelectionDAG', 'LLVMAsmPrinter', 'LLVMX86Desc',
 107                 'LLVMObject', 'LLVMMCParser', 'LLVMBitReader', 'LLVMX86Info',
 108                 'LLVMX86AsmPrinter', 'LLVMX86Utils', 'LLVMJIT',
 109                 'LLVMExecutionEngine', 'LLVMCodeGen', 'LLVMScalarOpts',
 110                 'LLVMInstCombine', 'LLVMTransformUtils', 'LLVMipa',
 111                 'LLVMAnalysis', 'LLVMTarget', 'LLVMMC', 'LLVMCore',
 112                 'LLVMSupport'
 113             ])
 114         else:
 115             env.Prepend(LIBS = [
 116                 'LLVMBitWriter', 'LLVMX86Disassembler', 'LLVMX86AsmParser',
 117                 'LLVMX86CodeGen', 'LLVMX86Desc', 'LLVMSelectionDAG',
 118                 'LLVMAsmPrinter', 'LLVMMCParser', 'LLVMX86AsmPrinter',
 119                 'LLVMX86Utils', 'LLVMX86Info', 'LLVMMCJIT', 'LLVMJIT',
 120                 'LLVMExecutionEngine', 'LLVMCodeGen', 'LLVMScalarOpts',
 121                 'LLVMInstCombine', 'LLVMTransformUtils', 'LLVMipa',
 122                 'LLVMAnalysis', 'LLVMTarget', 'LLVMMC', 'LLVMCore',
 123                 'LLVMSupport', 'LLVMRuntimeDyld', 'LLVMObject'
 124             ])
 125         env.Append(LIBS = [
 126             'imagehlp',
 127             'psapi',
 128             'shell32',
 129             'advapi32'
 130         ])
 131         if env['msvc']:
 132             # Some of the LLVM C headers use the inline keyword without
 133             # defining it.
 134             env.Append(CPPDEFINES = [('inline', '__inline')])
 135             if env['build'] in ('debug', 'checked'):
 136                 # LLVM libraries are static, build with /MT, and they
 137                 # automatically link agains LIBCMT. When we're doing a
 138                 # debug build we'll be linking against LIBCMTD, so disable
 139                 # that.
 140                 env.Append(LINKFLAGS = ['/nodefaultlib:LIBCMT'])
 141     else:
 142         if not env.Detect('llvm-config'):
 143             print 'scons: llvm-config script not found'
 144             return
 145
 146         llvm_version = env.backtick('llvm-config --version').rstrip()
 147         llvm_version = distutils.version.LooseVersion(llvm_version)
 148
 149         if llvm_version < distutils.version.LooseVersion(required_llvm_version):
 150             print 'scons: LLVM version %s found, but %s is required' % (llvm_version, required_llvm_version)
 151             return
 152
 153         try:
 154             # Treat --cppflags specially to prevent NDEBUG from disabling
 155             # assertion failures in debug builds.
 156             cppflags = env.ParseFlags('!llvm-config --cppflags')
 157             try:
 158                 cppflags['CPPDEFINES'].remove('NDEBUG')
 159             except ValueError:
 160                 pass
 161             env.MergeFlags(cppflags)
 162
 163             # Match llvm --fno-rtti flag
 164             cxxflags = env.backtick('llvm-config --cxxflags').split()
 165             if '-fno-rtti' in cxxflags:
 166                 env.Append(CXXFLAGS = ['-fno-rtti'])
 167
 168             components = ['engine', 'mcjit', 'bitwriter', 'x86asmprinter']
 169
 170             env.ParseConfig('llvm-config --libs ' + ' '.join(components))
 171             env.ParseConfig('llvm-config --ldflags')
 172             if llvm_version >= distutils.version.LooseVersion('3.5'):
 173                 env.ParseConfig('llvm-config --system-libs')
 174                 env.Append(CXXFLAGS = ['-std=c++11'])
 175         except OSError:
 176             print 'scons: llvm-config version %s failed' % llvm_version
 177             return
 178
 179     assert llvm_version is not None
 180     env['llvm'] = True
 181
 182     print 'scons: Found LLVM version %s' % llvm_version
 183     env['LLVM_VERSION'] = llvm_version
 184
 185     # Define HAVE_LLVM macro with the major/minor version number (e.g., 0x0206 for 2.6)
 186     llvm_version_major = int(llvm_version.version[0])
 187     llvm_version_minor = int(llvm_version.version[1])
 188     llvm_version_hex = '0x%02x%02x' % (llvm_version_major, llvm_version_minor)
 189     env.Prepend(CPPDEFINES = [('HAVE_LLVM', llvm_version_hex)])
 190
 191 def exists(env):
 192     return True
 193
 194 # vim:set ts=4 sw=4 et: