Method: MakeMakefile#create_makefile

Defined in:

lib/mkmf.rb

#create_makefile(target, srcprefix = nil) ⇒ Object

Generates the Makefile for your extension, passing along any options and preprocessor constants that you may have generated through other methods.

The target name should correspond the name of the global function name defined within your C extension, minus the Init_. For example, if your C extension is defined as Init_foo, then your target would simply be “foo”.

If any “/” characters are present in the target name, only the last name is interpreted as the target name, and the rest are considered toplevel directory names, and the generated Makefile will be altered accordingly to follow that directory structure.

For example, if you pass “test/foo” as a target name, your extension will be installed under the “test” directory. This means that in order to load the file within a Ruby program later, that directory structure will have to be followed, e.g. require 'test/foo'.

The srcprefix should be used when your source files are not in the same directory as your build script. This will not only eliminate the need for you to manually copy the source files into the same directory as your build script, but it also sets the proper target_prefix in the generated Makefile.

Setting the target_prefix will, in turn, install the generated binary in a directory under your RbConfig::CONFIG['sitearchdir'] that mimics your local filesystem when you run make install.

For example, given the following file tree:

ext/
  extconf.rb
  test/
    foo.c

And given the following code:

create_makefile('test/foo', 'test')

That will set the target_prefix in the generated Makefile to “test”. That, in turn, will create the following file tree when installed via the make install command:

/path/to/ruby/sitearchdir/test/foo.so

It is recommended that you use this approach to generate your makefiles, instead of copying files around manually, because some third party libraries may depend on the target_prefix being set properly.

The srcprefix argument can be used to override the default source directory, i.e. the current directory. It is included as part of the VPATH and added to the list of INCFLAGS.

# File 'lib/mkmf.rb', line 2219

def create_makefile(target, srcprefix = nil)
  $target = target
  libpath = $DEFLIBPATH|$LIBPATH
  message "creating Makefile\n"
  MakeMakefile.rm_f "#{CONFTEST}*"
  if CONFIG["DLEXT"] == $OBJEXT
    for lib in libs = $libs.split(' ')
      lib.sub!(/-l(.*)/, %%"lib\\1.#{$LIBEXT}"%)
    end
    $defs.push(format("-DEXTLIB='%s'", libs.join(",")))
  end

  if target.include?('/')
    target_prefix, target = File.split(target)
    target_prefix[0,0] = '/'
  else
    target_prefix = ""
  end

  srcprefix ||= "$(srcdir)/#{srcprefix}".chomp('/')
  RbConfig.expand(srcdir = srcprefix.dup)

  ext = ".#{$OBJEXT}"
  orig_srcs = Dir[File.join(srcdir, "*.{#{SRC_EXT.join(%q{,})}}")].sort
  if not $objs
    srcs = $srcs || orig_srcs
    $objs = []
    objs = srcs.inject(Hash.new {[]}) {|h, f|
      h.key?(o = File.basename(f, ".*") << ext) or $objs << o
      h[o] <<= f
      h
    }
    unless objs.delete_if {|b, f| f.size == 1}.empty?
      dups = objs.sort.map {|b, f|
        "#{b[/.*\./]}{#{f.collect {|n| n[/([^.]+)\z/]}.join(',')}}"
      }
      abort "source files duplication - #{dups.join(", ")}"
    end
  else
    $objs.collect! {|o| File.basename(o, ".*") << ext} unless $OBJEXT == "o"
    srcs = $srcs || $objs.collect {|o| o.chomp(ext) << ".c"}
  end
  $srcs = srcs

  hdrs = Dir[File.join(srcdir, "*.{#{HDR_EXT.join(%q{,})}}")]

  target = nil if $objs.empty?

  if target and EXPORT_PREFIX
    if File.exist?(File.join(srcdir, target + '.def'))
      deffile = "$(srcdir)/$(TARGET).def"
      unless EXPORT_PREFIX.empty?
        makedef = %{$(RUBY) -pe "$$_.sub!(/^(?=\\w)/,'#{EXPORT_PREFIX}') unless 1../^EXPORTS$/i" #{deffile}}
      end
    else
      makedef = %{(echo EXPORTS && echo $(TARGET_ENTRY))}
    end
    if makedef
      $cleanfiles << '$(DEFFILE)'
      origdef = deffile
      deffile = "$(TARGET)-$(arch).def"
    end
  end
  origdef ||= ''

  if $extout and $INSTALLFILES
    $cleanfiles.concat($INSTALLFILES.collect {|files, dir|File.join(dir, files.delete_prefix('./'))})
    $distcleandirs.concat($INSTALLFILES.collect {|files, dir| dir})
  end

  if $extmk and $static
    $defs << "-DRUBY_EXPORT=1"
  end

  if $extmk and not $extconf_h
    create_header
  end

  libpath = libpathflag(libpath)

  dllib = target ? "$(TARGET).#{CONFIG['DLEXT']}" : ""
  staticlib = target ? "$(TARGET).#$LIBEXT" : ""
  conf = configuration(srcprefix)
  conf << "\
libpath = #{($DEFLIBPATH|$LIBPATH).join(" ")}
LIBPATH = #{libpath}
DEFFILE = #{deffile}

CLEANFILES = #{$cleanfiles.join(' ')}
DISTCLEANFILES = #{$distcleanfiles.join(' ')}
DISTCLEANDIRS = #{$distcleandirs.join(' ')}

extout = #{$extout && $extout.quote}
extout_prefix = #{$extout_prefix}
target_prefix = #{target_prefix}
LOCAL_LIBS = #{$LOCAL_LIBS}
LIBS = #{$LIBRUBYARG} #{$libs} #{$LIBS}
ORIG_SRCS = #{orig_srcs.collect(&File.method(:basename)).join(' ')}
SRCS = $(ORIG_SRCS) #{(srcs - orig_srcs).collect(&File.method(:basename)).join(' ')}
OBJS = #{$objs.join(" ")}
HDRS = #{hdrs.map{|h| '$(srcdir)/' + File.basename(h)}.join(' ')}
LOCAL_HDRS = #{$headers.join(' ')}
TARGET = #{target}
TARGET_NAME = #{target && target[/\A\w+/]}
TARGET_ENTRY = #{EXPORT_PREFIX || ''}Init_$(TARGET_NAME)
DLLIB = #{dllib}
EXTSTATIC = #{$static || ""}
STATIC_LIB = #{staticlib unless $static.nil?}
#{!$extout && defined?($installed_list) ? "INSTALLED_LIST = #{$installed_list}\n" : ""}
TIMESTAMP_DIR = #{$extout && $extmk ? '$(extout)/.timestamp' : '.'}
" #"
  # TODO: fixme
  install_dirs.each {|d| conf << ("%-14s= %s\n" % d) if /^[[:upper:]]/ =~ d[0]}
  sodir = $extout ? '$(TARGET_SO_DIR)' : '$(RUBYARCHDIR)'
  n = '$(TARGET_SO_DIR)$(TARGET)'
  conf << "\
TARGET_SO_DIR =#{$extout ? " $(RUBYARCHDIR)/" : ''}
TARGET_SO     = $(TARGET_SO_DIR)$(DLLIB)
CLEANLIBS     = #{'$(TARGET_SO) ' if target}#{config_string('cleanlibs') {|t| t.gsub(/\$\*/) {n}}}
CLEANOBJS     = *.#{$OBJEXT} #{config_string('cleanobjs') {|t| t.gsub(/\$\*/, "$(TARGET)#{deffile ? '-$(arch)': ''}")} if target} *.bak
" #"

  conf = yield(conf) if block_given?
  mfile = open("Makefile", "wb")
  mfile.puts(conf)
  mfile.print "
all:    #{$extout ? "install" : target ? "$(DLLIB)" : "Makefile"}
static: #{$extmk && !$static ? "all" : "$(STATIC_LIB)#{$extout ? " install-rb" : ""}"}
.PHONY: all install static install-so install-rb
.PHONY: clean clean-so clean-static clean-rb
" #"
  mfile.print CLEANINGS
  fsep = config_string('BUILD_FILE_SEPARATOR') {|s| s unless s == "/"}
  if fsep
    sep = ":/=#{fsep}"
    fseprepl = proc {|s|
      s = s.gsub("/", fsep)
      s = s.gsub(/(\$\(\w+)(\))/) {$1+sep+$2}
      s.gsub(/(\$\{\w+)(\})/) {$1+sep+$2}
    }
    rsep = ":#{fsep}=/"
  else
    fseprepl = proc {|s| s}
    sep = ""
    rsep = ""
  end
  dirs = []
  mfile.print "install: install-so install-rb\n\n"
  dir = sodir.dup
  mfile.print("install-so: ")
  if target
    f = "$(DLLIB)"
    dest = "$(TARGET_SO)"
    stamp = timestamp_file(dir, target_prefix)
    if $extout
      mfile.puts dest
      mfile.print "clean-so::\n"
      mfile.print "\t-$(Q)$(RM) #{fseprepl[dest]} #{fseprepl[stamp]}\n"
      mfile.print "\t-$(Q)$(RMDIRS) #{fseprepl[dir]}#{$ignore_error}\n"
    else
      mfile.print "#{f} #{stamp}\n"
      mfile.print "\t$(INSTALL_PROG) #{fseprepl[f]} #{dir}\n"
      if defined?($installed_list)
        mfile.print "\t@echo #{dir}/#{File.basename(f)}>>$(INSTALLED_LIST)\n"
      end
    end
    mfile.print "clean-static::\n"
    mfile.print "\t-$(Q)$(RM) $(STATIC_LIB)\n"
  else
    mfile.puts "Makefile"
  end
  mfile.print("install-rb: pre-install-rb do-install-rb install-rb-default\n")
  mfile.print("install-rb-default: pre-install-rb-default do-install-rb-default\n")
  mfile.print("pre-install-rb: Makefile\n")
  mfile.print("pre-install-rb-default: Makefile\n")
  mfile.print("do-install-rb:\n")
  mfile.print("do-install-rb-default:\n")
  for sfx, i in [["-default", [["lib/**/*.rb", "$(RUBYLIBDIR)", "lib"]]], ["", $INSTALLFILES]]
    files = install_files(mfile, i, nil, srcprefix) or next
    for dir, *files in files
      unless dirs.include?(dir)
        dirs << dir
        mfile.print "pre-install-rb#{sfx}: #{timestamp_file(dir, target_prefix)}\n"
      end
      for f in files
        dest = "#{dir}/#{File.basename(f)}"
        mfile.print("do-install-rb#{sfx}: #{dest}\n")
        mfile.print("#{dest}: #{f} #{timestamp_file(dir, target_prefix)}\n")
        mfile.print("\t$(Q) $(#{$extout ? 'COPY' : 'INSTALL_DATA'}) #{f} $(@D)\n")
        if defined?($installed_list) and !$extout
          mfile.print("\t@echo #{dest}>>$(INSTALLED_LIST)\n")
        end
        if $extout
          mfile.print("clean-rb#{sfx}::\n")
          mfile.print("\t-$(Q)$(RM) #{fseprepl[dest]}\n")
        end
      end
    end
    mfile.print "pre-install-rb#{sfx}:\n"
    if files.empty?
      mfile.print("\t@$(NULLCMD)\n")
    else
      q = "$(MAKE) -q do-install-rb#{sfx}"
      if $nmake
        mfile.print "!if \"$(Q)\" == \"@\"\n\t@#{q} || \\\n!endif\n\t"
      else
        mfile.print "\t$(Q1:0=@#{q} || )"
      end
      mfile.print "$(ECHO1:0=echo) installing#{sfx.sub(/^-/, " ")} #{target} libraries\n"
    end
    if $extout
      dirs.uniq!
      unless dirs.empty?
        mfile.print("clean-rb#{sfx}::\n")
        for dir in dirs.sort_by {|d| -d.count('/')}
          stamp = timestamp_file(dir, target_prefix)
          mfile.print("\t-$(Q)$(RM) #{fseprepl[stamp]}\n")
          mfile.print("\t-$(Q)$(RMDIRS) #{fseprepl[dir]}#{$ignore_error}\n")
        end
      end
    end
  end
  dirs.unshift(sodir) if target and !dirs.include?(sodir)
  dirs.each do |d|
    t = timestamp_file(d, target_prefix)
    mfile.print "#{t}:\n\t$(Q) $(MAKEDIRS) $(@D) #{d}\n\t$(Q) $(TOUCH) $@\n"
  end

  mfile.print <<-SITEINSTALL

site-install: site-install-so site-install-rb
site-install-so: install-so
site-install-rb: install-rb

  SITEINSTALL

  return unless target

  mfile.print ".SUFFIXES: .#{(SRC_EXT + [$OBJEXT, $ASMEXT]).compact.join(' .')}\n"
  mfile.print "\n"

  compile_command = "\n\t$(ECHO) compiling $(<#{rsep})\n\t$(Q) %s\n\n"
  command = compile_command % COMPILE_CXX
  asm_command = compile_command.sub(/compiling/, 'translating') % ASSEMBLE_CXX
  CXX_EXT.each do |e|
    each_compile_rules do |rule|
      mfile.printf(rule, e, $OBJEXT)
      mfile.print(command)
      mfile.printf(rule, e, $ASMEXT)
      mfile.print(asm_command)
    end
  end
  command = compile_command % COMPILE_C
  asm_command = compile_command.sub(/compiling/, 'translating') % ASSEMBLE_C
  C_EXT.each do |e|
    each_compile_rules do |rule|
      mfile.printf(rule, e, $OBJEXT)
      mfile.print(command)
      mfile.printf(rule, e, $ASMEXT)
      mfile.print(asm_command)
    end
  end

  mfile.print "$(TARGET_SO): "
  mfile.print "$(DEFFILE) " if makedef
  mfile.print "$(OBJS) Makefile"
  mfile.print " #{timestamp_file(sodir, target_prefix)}" if $extout
  mfile.print "\n"
  mfile.print "\t$(ECHO) linking shared-object #{target_prefix.sub(/\A\/(.*)/, '\1/')}$(DLLIB)\n"
  mfile.print "\t-$(Q)$(RM) $(@#{sep})\n"
  link_so = LINK_SO.gsub(/^/, "\t$(Q) ")
  if srcs.any?(&%r"\.(?:#{CXX_EXT.join('|')})\z".method(:===))
    link_so = link_so.sub(/\bLDSHARED\b/, '\&XX')
  end
  mfile.print link_so, "\n\n"
  unless $static.nil?
    mfile.print "$(STATIC_LIB): $(OBJS)\n\t-$(Q)$(RM) $(@#{sep})\n\t"
    mfile.print "$(ECHO) linking static-library $(@#{rsep})\n\t$(Q) "
    mfile.print "$(AR) #{config_string('ARFLAGS') || 'cru '}$@ $(OBJS)"
    config_string('RANLIB') do |ranlib|
      mfile.print "\n\t-$(Q)#{ranlib} $(@) 2> /dev/null || true"
    end
  end
  mfile.print "\n\n"
  if makedef
    mfile.print "$(DEFFILE): #{origdef}\n"
    mfile.print "\t$(ECHO) generating $(@#{rsep})\n"
    mfile.print "\t$(Q) #{makedef} > $@\n\n"
  end

  depend = File.join(srcdir, "depend")
  if File.exist?(depend)
    mfile.print("###\n", *depend_rules(File.read(depend)))
  else
    mfile.print "$(OBJS): $(HDRS) $(ruby_headers)\n"
  end

  $makefile_created = true
ensure
  mfile.close if mfile
end