Class: Libv8::Builder

Inherits:
Object
  • Object
show all
Includes:
Arch, Make, Patcher
Defined in:
ext/libv8/builder.rb

Constant Summary

Constants included from Patcher

Patcher::PATCH_DIRECTORY

Instance Method Summary collapse

Methods included from Patcher

patch!

Methods included from Make

make

Methods included from Arch

libv8_arch

Constructor Details

#initialize ⇒ Builder

Returns a new instance of Builder.



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# File 'ext/libv8/builder.rb', line 19

def initialize
  @compiler = choose_compiler
end

Instance Method Details

#build_libv8! ⇒ Object 



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# File 'ext/libv8/builder.rb', line 58

def build_libv8!
  setup_python!
  setup_build_deps!
  Dir.chdir(File.expand_path('../../../vendor/v8', __FILE__)) do
    fail 'No compilers available' if @compiler.nil?
    patch!
    print_build_info
    puts 'Beginning compilation. This will take some time.'

    command = "env CXX=#{Shellwords.escape @compiler.to_s} LINK=#{Shellwords.escape @compiler.to_s} #{make} #{make_flags}"
    puts "Building v8 with #{command}"
    system command
  end
  return $?.exitstatus
end

#gyp_defines(*defines) ⇒ Object 



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# File 'ext/libv8/builder.rb', line 28

def gyp_defines(*defines)
  # Do not use an external snapshot as we don't really care for binary size
  defines << 'v8_use_external_startup_data=0'

  # Do not use the GPLv3 ld.gold binary on Linux
  defines << 'linux_use_bundled_gold=0'

  # Pass clang flag to GYP in order to work around GCC compilation failures
  defines << "clang=#{@compiler.is_a?(Compiler::Clang) ? '1' : '0'}"

  "GYP_DEFINES=\"#{defines.join ' '}\""
end

#make_flags(*flags) ⇒ Object 



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# File 'ext/libv8/builder.rb', line 41

def make_flags(*flags)
  # Disable i18n
  flags << 'i18nsupport=off'

  # Solaris / Smart OS requires additional -G flag to use with -fPIC
  flags << "CFLAGS=-G" if @compiler.target =~ /solaris/

  # Disable werror as this version of v8 is getting difficult to maintain
  # with it on
  flags << 'werror=no'

  # Append GYP variable definitions
  flags << gyp_defines

  "#{make_target} #{flags.join ' '}"
end

#make_target ⇒ Object 



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# File 'ext/libv8/builder.rb', line 23

def make_target
  profile = enable_config('debug') ? 'debug' : 'release'
  "#{libv8_arch}.#{profile}"
end

#setup_build_deps! ⇒ Object

Checkout all of the V8 source and its dependencies using the chromium depot tools.

chromium.googlesource.com/v8/v8.git#Getting-the-Code



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# File 'ext/libv8/builder.rb', line 102

def setup_build_deps!
  ENV['PATH'] = "#{File.expand_path('../../../vendor/depot_tools', __FILE__)}:#{ENV['PATH']}"
  Dir.chdir(File.expand_path('../../../vendor', __FILE__)) do
    unless Dir.exists? 'v8'
      system "fetch v8" or fail "unable to fetch v8 source"
    else
      system "gclient fetch" or fail "could not fetch v8 build dependencies commits"
    end
    Dir.chdir('v8') do
      unless system "git checkout #{source_version} -- ."
        fail "unable to checkout source for v8 #{source_version}"
      end
      system "gclient sync" or fail "could not sync v8 build dependencies"
      system "git checkout Makefile" # Work around a weird bug on FreeBSD
    end
  end
end

#setup_python! ⇒ Object 



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# File 'ext/libv8/builder.rb', line 74

def setup_python!
  # If python v2 cannot be found in PATH,
  # create a symbolic link to python2 the current directory and put it
  # at the head of PATH. That way all commands that inherit this environment
  # will use ./python -> python2
  if python_version !~ /^2/
    unless system 'which python2 2>&1 > /dev/null'
      fail "libv8 requires python 2 to be installed in order to build, but it is currently #{python_version}"
    end
    `ln -fs #{`which python2`.chomp} python`
    ENV['PATH'] = "#{File.expand_path '.'}:#{ENV['PATH']}"
  end
end

#source_version ⇒ Object

The release tag to checkout. If this is version 4.5.95.0 of the libv8 gem, then this will be 4.5.95



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# File 'ext/libv8/builder.rb', line 92

def source_version
  Libv8::VERSION.gsub(/\.[^.]+$/, '')
end