scons/llvm.py

"""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 subprocess

import SCons.Action
import SCons.Errors
import SCons.Util


def generate(env):
    try:
        llvm_dir = os.environ['LLVM']
    except KeyError:
        # Do nothing -- use the system headers/libs
        pass
    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):
            raise SCons.Errors.InternalError, "LLVM build directory not found"

        env.PrependENVPath('PATH', llvm_bin_dir)

    if env.Detect('llvm-config'):
        pipe = SCons.Action._subproc(env, 
                                     ['llvm-config', '--version'],
                                     stdin = 'devnull',
                                     stderr = 'devnull',
                                     stdout = subprocess.PIPE)
        if pipe.wait() != 0:
            return
        line = pipe.stdout.read().strip()
        if not line:
            return
        env['LLVM_VERSION'] = line

        env.ParseConfig('llvm-config --cppflags')
        env.ParseConfig('llvm-config --libs jit interpreter nativecodegen bitwriter')
        env.ParseConfig('llvm-config --ldflags')
        env['LINK'] = env['CXX']

def exists(env):
    return True

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