module MakeMakefile

mkmf.rb is used by Ruby C extensions to generate a Makefile which will correctly compile and link the C extension to Ruby and a third-party library.

Constants

ASSEMBLE_C

Command which will translate C files to assembler sources in the generated Makefile

ASSEMBLE_CXX

Command which will translate C++ files to assembler sources in the generated Makefile

CLEANINGS

Makefile rules that will clean the extension build directory

COMMON_HEADERS

Common headers for Ruby C extensions

COMMON_LIBS

Common libraries for Ruby C extensions

COMPILE_C

Command which will compile C files in the generated Makefile

COMPILE_CXX

Command which will compile C++ files in the generated Makefile

COMPILE_RULES

make compile rules

CONFIG

The makefile configuration using the defaults from when Ruby was built.

CXX_EXT

Extensions for files complied with a C++ compiler

C_EXT

Extensions for files compiled with a C compiler

EXPORT_PREFIX
HDR_EXT

Extensions for header files

LIBARG

Argument which will add a library to the linker

LIBPATHFLAG

Argument which will add a library path to the linker

Command which will link a shared library

MAIN_DOES_NOTHING

A C main function which does no work

ORIG_LIBPATH
RPATHFLAG
RULE_SUBST
SRC_EXT

Extensions for source files

Command which will compile a program in order to test linking a library

UNIVERSAL_INTS

Public Instance Methods

check_signedness(type, headers = nil, opts = nil, &b) click to toggle source

Returns the signedness of the given type. You may optionally specify additional headers to search in for the type.

If the type is found and is a numeric type, a macro is passed as a preprocessor constant to the compiler using the type name, in uppercase, prepended with SIGNEDNESS_OF_, followed by the type name, followed by =X where “X” is positive integer if the type is unsigned and a negative integer if the type is signed.

For example, if size_t is defined as unsigned, then check_signedness('size_t') would return +1 and the SIGNEDNESS_OF_SIZE_T=+1 preprocessor macro would be passed to the compiler. The SIGNEDNESS_OF_INT=-1 macro would be set for check_signedness('int')

# File lib/mkmf.rb, line 1354
def check_signedness(type, headers = nil, opts = nil, &b)
  typedef, member, prelude = typedef_expr(type, headers)
  signed = nil
  checking_for("signedness of #{type}", STRING_OR_FAILED_FORMAT) do
    signed = try_signedness(typedef, member, [prelude], opts, &b) or next nil
    $defs.push("-DSIGNEDNESS_OF_%s=%+d" % [type.tr_cpp, signed])
    signed < 0 ? "signed" : "unsigned"
  end
  signed
end
check_sizeof(type, headers = nil, opts = "", &b) click to toggle source

Returns the size of the given type. You may optionally specify additional headers to search in for the type.

If found, a macro is passed as a preprocessor constant to the compiler using the type name, in uppercase, prepended with SIZEOF_, followed by the type name, followed by =X where “X” is the actual size.

For example, if check_sizeof('mystruct') returned 12, then the SIZEOF_MYSTRUCT=12 preprocessor macro would be passed to the compiler.

# File lib/mkmf.rb, line 1325
def check_sizeof(type, headers = nil, opts = "", &b)
  typedef, member, prelude = typedef_expr(type, headers)
  prelude << "#{typedef} *rbcv_ptr_;\n"
  prelude = [prelude]
  expr = "sizeof((*rbcv_ptr_)#{"." << member if member})"
  fmt = STRING_OR_FAILED_FORMAT
  checking_for checking_message("size of #{type}", headers), fmt do
    if size = try_constant(expr, prelude, opts, &b)
      $defs.push(format("-DSIZEOF_%s=%s", type.tr_cpp, size))
      size
    end
  end
end
convertible_int(type, headers = nil, opts = nil, &b) click to toggle source

Returns the convertible integer type of the given type. You may optionally specify additional headers to search in for the type. convertible means actually the same type, or typedef'd from the same type.

If the type is a integer type and the convertible type is found, the following macros are passed as preprocessor constants to the compiler using the type name, in uppercase.

  • TYPEOF_, followed by the type name, followed by =X where “X” is the found convertible type name.

  • TYP2NUM and NUM2TYP, where TYP is the type name in uppercase with replacing an _t suffix with “T”, followed by =X where “X” is the macro name to convert type to an Integer object, and vice versa.

For example, if foobar_t is defined as unsigned long, then convertible_int("foobar_t") would return “unsigned long”, and define these macros:

#define TYPEOF_FOOBAR_T unsigned long
#define FOOBART2NUM ULONG2NUM
#define NUM2FOOBART NUM2ULONG
# File lib/mkmf.rb, line 1389
def convertible_int(type, headers = nil, opts = nil, &b)
  type, macname = *type
  checking_for("convertible type of #{type}", STRING_OR_FAILED_FORMAT) do
    if UNIVERSAL_INTS.include?(type)
      type
    else
      typedef, member, prelude = typedef_expr(type, headers, &b)
      if member
        prelude << "static rbcv_typedef_ rbcv_var;"
        compat = UNIVERSAL_INTS.find {|t|
          try_static_assert("sizeof(rbcv_var.#{member}) == sizeof(#{t})", [prelude], opts, &b)
        }
      else
        next unless signed = try_signedness(typedef, member, [prelude])
        u = "unsigned " if signed > 0
        prelude << "extern rbcv_typedef_ foo();"
        compat = UNIVERSAL_INTS.find {|t|
          try_compile([prelude, "extern #{u}#{t} foo();"].join("\n"), opts, :werror=>true, &b)
        }
      end
      if compat
        macname ||= type.sub(/_(?=t\z)/, '').tr_cpp
        conv = (compat == "long long" ? "LL" : compat.upcase)
        compat = "#{u}#{compat}"
        typename = type.tr_cpp
        $defs.push(format("-DSIZEOF_%s=SIZEOF_%s", typename, compat.tr_cpp))
        $defs.push(format("-DTYPEOF_%s=%s", typename, compat.quote))
        $defs.push(format("-DPRI_%s_PREFIX=PRI_%s_PREFIX", macname, conv))
        conv = (u ? "U" : "") + conv
        $defs.push(format("-D%s2NUM=%s2NUM", macname, conv))
        $defs.push(format("-DNUM2%s=NUM2%s", macname, conv))
        compat
      end
    end
  end
end
create_header(header = "extconf.h") click to toggle source

Generates a header file consisting of the various macro definitions generated by other methods such as #have_func and have_header. These are then wrapped in a custom #ifndef based on the header file name, which defaults to “extconf.h”.

For example:

# extconf.rb
require 'mkmf'
have_func('realpath')
have_header('sys/utime.h')
create_header
create_makefile('foo')

The above script would generate the following extconf.h file:

#ifndef EXTCONF_H
#define EXTCONF_H
#define HAVE_REALPATH 1
#define HAVE_SYS_UTIME_H 1
#endif

Given that the #create_header method generates a file based on definitions set earlier in your extconf.rb file, you will probably want to make this one of the last methods you call in your script.

# File lib/mkmf.rb, line 1680
def create_header(header = "extconf.h")
  message "creating %s\n", header
  sym = header.tr_cpp
  hdr = ["#ifndef #{sym}\n#define #{sym}\n"]
  for line in $defs
    case line
    when /^-D([^=]+)(?:=(.*))?/
      hdr << "#define #$1 #{$2 ? Shellwords.shellwords($2)[0].gsub(/(?=\t+)/, "\\\n") : 1}\n"
    when /^-U(.*)/
      hdr << "#undef #$1\n"
    end
  end
  hdr << "#endif\n"
  hdr = hdr.join("")
  log_src(hdr, "#{header} is")
  unless (IO.read(header) == hdr rescue false)
    open(header, "wb") do |hfile|
      hfile.write(hdr)
    end
  end
  $extconf_h = header
end
create_makefile(target, srcprefix = nil) { |conf| ... } click to toggle source

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 2179
  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.sub(/\A\.\//, ''))})
      $distcleandirs.concat($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).#$LIBEXT" : ""
    mfile = open("Makefile", "wb")
    conf = configuration(srcprefix)
    conf = yield(conf) if block_given?
    mfile.puts(conf)
    mfile.print "
libpath = #{($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| '$(srcdir)/' + File.basename(h)}.join(' ')}
TARGET = #{target}
TARGET_NAME = #{target && target[/\A\w+/]}
TARGET_ENTRY = #{EXPORT_PREFIX || ''}Init_$(TARGET_NAME)
DLLIB = #{dllib}
EXTSTATIC = #{$static || ""}
STATIC_LIB = #{staticlib unless $static.nil?}
#{!$extout && defined?($installed_list) ? "INSTALLED_LIST = #{$installed_list}\n" : ""}
TIMESTAMP_DIR = #{$extout ? '$(extout)/.timestamp' : '.'}
" #"
    # TODO: fixme
    install_dirs.each {|d| mfile.print("%-14s= %s\n" % d) if /^[[:upper:]]/ =~ d[0]}
    n = ($extout ? '$(RUBYARCHDIR)/' : '') + '$(TARGET)'
    mfile.print "
TARGET_SO     = #{($extout ? '$(RUBYARCHDIR)/' : '')}$(DLLIB)
CLEANLIBS     = #{n}.#{CONFIG['DLEXT']} #{config_string('cleanlibs') {|t| t.gsub(/\$\*/) {n}}}
CLEANOBJS     = *.#{$OBJEXT} #{config_string('cleanobjs') {|t| t.gsub(/\$\*/, "$(TARGET)#{deffile ? '-$(arch)': ''}")} if target} *.bak

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+$2}
      }
      rsep = ":#{fsep}=/"
    else
      fseprepl = proc {|s| s}
      sep = ""
      rsep = ""
    end
    dirs = []
    mfile.print "install: install-so install-rb\n\n"
    sodir = (dir = "$(RUBYARCHDIR)").dup
    mfile.print("install-so: ")
    if target
      f = "$(DLLIB)"
      dest = "#{dir}/#{f}"
      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) $(STATIC_LIB)\n"
    else
      mfile.puts "Makefile"
    end
    mfile.print("install-rb: pre-install-rb install-rb-default\n")
    mfile.print("install-rb-default: pre-install-rb-default\n")
    mfile.print("pre-install-rb: Makefile\n")
    mfile.print("pre-install-rb-default: Makefile\n")
    for sfx, i in [["-default", [["lib/**/*.rb", "$(RUBYLIBDIR)", "lib"]]], ["", $INSTALLFILES]]
      files = install_files(mfile, i, nil, srcprefix) or next
      for dir, *files in files
        unless dirs.include?(dir)
          dirs << dir
          mfile.print "pre-install-rb#{sfx}: #{timestamp_file(dir, target_prefix)}\n"
        end
        for f in files
          dest = "#{dir}/#{File.basename(f)}"
          mfile.print("install-rb#{sfx}: #{dest}\n")
          mfile.print("#{dest}: #{f} #{timestamp_file(dir, target_prefix)}\n")
          mfile.print("\t$(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
        mfile.print("\t$(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.puts SRC_EXT.collect {|e| ".path.#{e} = $(VPATH)"} if $nmake == ?b
    mfile.print ".SUFFIXES: .#{(SRC_EXT + [$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 "$(RUBYARCHDIR)/" if $extout
    mfile.print "$(DLLIB): "
    mfile.print "$(DEFFILE) " if makedef
    mfile.print "$(OBJS) Makefile"
    mfile.print " #{timestamp_file('$(RUBYARCHDIR)', 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

  # :stopdoc:

  def init_mkmf(config = CONFIG, rbconfig = RbConfig::CONFIG)
    $makefile_created = false
    $arg_config = []
    $enable_shared = config['ENABLE_SHARED'] == 'yes'
    $defs = []
    $extconf_h = nil
    if $warnflags = CONFIG['warnflags'] and CONFIG['GCC'] == 'yes'
      # turn warnings into errors only for bundled extensions.
      config['warnflags'] = $warnflags.gsub(/(\A|\s)-Werror[-=]/, '\1-W')
      if /icc\z/ =~ config['CC']
        config['warnflags'].gsub!(/(\A|\s)-W(?:division-by-zero|deprecated-declarations)/, '\1')
      end
      RbConfig.expand(rbconfig['warnflags'] = config['warnflags'].dup)
      config.each do |key, val|
        RbConfig.expand(rbconfig[key] = val.dup) if /warnflags/ =~ val
      end
      $warnflags = config['warnflags'] unless $extmk
    end
    $CFLAGS = with_config("cflags", arg_config("CFLAGS", config["CFLAGS"])).dup
    $CXXFLAGS = (with_config("cxxflags", arg_config("CXXFLAGS", config["CXXFLAGS"]))||'').dup
    $ARCH_FLAG = with_config("arch_flag", arg_config("ARCH_FLAG", config["ARCH_FLAG"])).dup
    $CPPFLAGS = with_config("cppflags", arg_config("CPPFLAGS", config["CPPFLAGS"])).dup
    $LDFLAGS = with_config("ldflags", arg_config("LDFLAGS", config["LDFLAGS"])).dup
    $INCFLAGS = "-I$(arch_hdrdir)"
    $INCFLAGS << " -I$(hdrdir)/ruby/backward" unless $extmk
    $INCFLAGS << " -I$(hdrdir) -I$(srcdir)"
    $DLDFLAGS = with_config("dldflags", arg_config("DLDFLAGS", config["DLDFLAGS"])).dup
    $LIBEXT = config['LIBEXT'].dup
    $OBJEXT = config["OBJEXT"].dup
    $EXEEXT = config["EXEEXT"].dup
    $ASMEXT = config_string('ASMEXT', &:dup) || 'S'
    $LIBS = "#{config['LIBS']} #{config['DLDLIBS']}"
    $LIBRUBYARG = ""
    $LIBRUBYARG_STATIC = config['LIBRUBYARG_STATIC']
    $LIBRUBYARG_SHARED = config['LIBRUBYARG_SHARED']
    $DEFLIBPATH = [$extmk ? "$(topdir)" : "$(#{config["libdirname"] || "libdir"})"]
    $DEFLIBPATH.unshift(".")
    $LIBPATH = []
    $INSTALLFILES = []
    $NONINSTALLFILES = [/~\z/, /\A#.*#\z/, /\A\.#/, /\.bak\z/i, /\.orig\z/, /\.rej\z/, /\.l[ao]\z/, /\.o\z/]
    $VPATH = %w[$(srcdir) $(arch_hdrdir)/ruby $(hdrdir)/ruby]

    $objs = nil
    $srcs = nil
    $libs = ""
    if $enable_shared or RbConfig.expand(config["LIBRUBY"].dup) != RbConfig.expand(config["LIBRUBY_A"].dup)
      $LIBRUBYARG = config['LIBRUBYARG']
    end

    $LOCAL_LIBS = ""

    $cleanfiles = config_string('CLEANFILES') {|s| Shellwords.shellwords(s)} || []
    $cleanfiles << "mkmf.log"
    $distcleanfiles = config_string('DISTCLEANFILES') {|s| Shellwords.shellwords(s)} || []
    $distcleandirs = config_string('DISTCLEANDIRS') {|s| Shellwords.shellwords(s)} || []

    $extout ||= nil
    $extout_prefix ||= nil

    $arg_config.clear
    dir_config("opt")
  end

  FailedMessage = <<MESSAGE
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers.  Check the mkmf.log file for more details.  You may
need configuration options.

Provided configuration options:
MESSAGE

  # Returns whether or not the Makefile was successfully generated. If not,
  # the script will abort with an error message.
  #
  # Internal use only.
  #
  def mkmf_failed(path)
    unless $makefile_created or File.exist?("Makefile")
      opts = $arg_config.collect {|t, n| "\t#{t}#{n ? "=#{n}" : ""}\n"}
      abort "*** #{path} failed ***\n" + FailedMessage + opts.join
    end
  end

  private

  def _libdir_basename
    @libdir_basename ||= config_string("libdir") {|name| name[/\A\$\(exec_prefix\)\/(.*)/, 1]} || "lib"
  end

  def MAIN_DOES_NOTHING(*refs)
    src = MAIN_DOES_NOTHING
    unless refs.empty?
      src = src.sub(/\{/) do
        $& +
          "\n  if (argc > 1000000) {\n" +
          refs.map {|n|"    printf(\"%p\", &#{n});\n"}.join("") +
          "  }\n"
      end
    end
    src
  end

  extend self
  init_mkmf

  $make = with_config("make-prog", ENV["MAKE"] || "make")
  make, = Shellwords.shellwords($make)
  $nmake = nil
  case
  when $mswin
    $nmake = ?m if /nmake/i =~ make
  end
  $ignore_error = $nmake ? '' : ' 2> /dev/null || true'

  RbConfig::CONFIG["srcdir"] = CONFIG["srcdir"] =
    $srcdir = arg_config("--srcdir", File.dirname($0))
  $configure_args["--topsrcdir"] ||= $srcdir
  if $curdir = arg_config("--curdir")
    RbConfig.expand(curdir = $curdir.dup)
  else
    curdir = $curdir = "."
  end
  unless File.expand_path(RbConfig::CONFIG["topdir"]) == File.expand_path(curdir)
    CONFIG["topdir"] = $curdir
    RbConfig::CONFIG["topdir"] = curdir
  end
  $configure_args["--topdir"] ||= $curdir
  $ruby = arg_config("--ruby", File.join(RbConfig::CONFIG["bindir"], CONFIG["ruby_install_name"]))

  RbConfig.expand(CONFIG["RUBY_SO_NAME"])

  # :startdoc:

  split = Shellwords.method(:shellwords).to_proc

  EXPORT_PREFIX = config_string('EXPORT_PREFIX') {|s| s.strip}

  hdr = ['#include "ruby.h"' "\n"]
  config_string('COMMON_MACROS') do |s|
    Shellwords.shellwords(s).each do |w|
      w, v = w.split(/=/, 2)
      hdr << "#ifndef #{w}"
      hdr << "#define #{[w, v].compact.join(" ")}"
      hdr << "#endif /* #{w} */"
    end
  end
  config_string('COMMON_HEADERS') do |s|
    Shellwords.shellwords(s).each {|w| hdr << "#include <#{w}>"}
  end

  ##
  # Common headers for Ruby C extensions

  COMMON_HEADERS = hdr.join("\n")

  ##
  # Common libraries for Ruby C extensions

  COMMON_LIBS = config_string('COMMON_LIBS', &split) || []

  ##
  # make compile rules

  COMPILE_RULES = config_string('COMPILE_RULES', &split) || %w[.%s.%s:]
  RULE_SUBST = config_string('RULE_SUBST')

  ##
  # Command which will compile C files in the generated Makefile

  COMPILE_C = config_string('COMPILE_C') || '$(CC) $(INCFLAGS) $(CPPFLAGS) $(CFLAGS) $(COUTFLAG)$@ -c $<'

  ##
  # Command which will compile C++ files in the generated Makefile

  COMPILE_CXX = config_string('COMPILE_CXX') || '$(CXX) $(INCFLAGS) $(CPPFLAGS) $(CXXFLAGS) $(COUTFLAG)$@ -c $<'

  ##
  # Command which will translate C files to assembler sources in the generated Makefile

  ASSEMBLE_C = config_string('ASSEMBLE_C') || COMPILE_C.sub(/(?<=\s)-c(?=\s)/, '-S')

  ##
  # Command which will translate C++ files to assembler sources in the generated Makefile

  ASSEMBLE_CXX = config_string('ASSEMBLE_CXX') || COMPILE_CXX.sub(/(?<=\s)-c(?=\s)/, '-S')

  ##
  # Command which will compile a program in order to test linking a library

  TRY_LINK = config_string('TRY_LINK') ||
    "$(CC) #{OUTFLAG}#{CONFTEST}#{$EXEEXT} $(INCFLAGS) $(CPPFLAGS) " \
    "$(CFLAGS) $(src) $(LIBPATH) $(LDFLAGS) $(ARCH_FLAG) $(LOCAL_LIBS) $(LIBS)"

  ##
  # Command which will link a shared library

  LINK_SO = (config_string('LINK_SO') || "").sub(/^$/) do
    if CONFIG["DLEXT"] == $OBJEXT
      "ld $(DLDFLAGS) -r -o $@ $(OBJS)\n"
    else
      "$(LDSHARED) #{OUTFLAG}$@ $(OBJS) " \
      "$(LIBPATH) $(DLDFLAGS) $(LOCAL_LIBS) $(LIBS)"
    end
  end

  ##
  # Argument which will add a library path to the linker

  LIBPATHFLAG = config_string('LIBPATHFLAG') || ' -L%s'
  RPATHFLAG = config_string('RPATHFLAG') || ''

  ##
  # Argument which will add a library to the linker

  LIBARG = config_string('LIBARG') || '-l%s'

  ##
  # A C main function which does no work

  MAIN_DOES_NOTHING = config_string('MAIN_DOES_NOTHING') || "int main(int argc, char **argv)\n{\n  return 0;\n}"
  UNIVERSAL_INTS = config_string('UNIVERSAL_INTS') {|s| Shellwords.shellwords(s)} ||
    %w[int short long long\ long]

  sep = config_string('BUILD_FILE_SEPARATOR') {|s| ":/=#{s}" if s != "/"} || ""

  ##
  # Makefile rules that will clean the extension build directory

  CLEANINGS = "
clean-static::
clean-rb-default::
clean-rb::
clean-so::
clean: clean-so clean-static clean-rb-default clean-rb
\t\t-$(Q)$(RM) $(CLEANLIBS#{sep}) $(CLEANOBJS#{sep}) $(CLEANFILES#{sep}) .*.time

distclean-rb-default::
distclean-rb::
distclean-so::
distclean-static::
distclean: clean distclean-so distclean-static distclean-rb-default distclean-rb
\t\t-$(Q)$(RM) Makefile $(RUBY_EXTCONF_H) #{CONFTEST}.* mkmf.log
\t\t-$(Q)$(RM) core ruby$(EXEEXT) *~ $(DISTCLEANFILES#{sep})
\t\t-$(Q)$(RMDIRS) $(DISTCLEANDIRS#{sep})#{$ignore_error}

realclean: distclean
"
end
depend_rules(depend) click to toggle source

Processes the data contents of the “depend” file. Each line of this file is expected to be a file name.

Returns the output of findings, in Makefile format.

# File lib/mkmf.rb, line 2066
def depend_rules(depend)
  suffixes = []
  depout = []
  cont = implicit = nil
  impconv = proc do
    each_compile_rules {|rule| depout << (rule % implicit[0]) << implicit[1]}
    implicit = nil
  end
  ruleconv = proc do |line|
    if implicit
      if /\A\t/ =~ line
        implicit[1] << line
        next
      else
        impconv[]
      end
    end
    if m = /\A\.(\w+)\.(\w+)(?:\s*:)/.match(line)
      suffixes << m[1] << m[2]
      implicit = [[m[1], m[2]], [m.post_match]]
      next
    elsif RULE_SUBST and /\A(?!\s*\w+\s*=)[$\w][^#]*:/ =~ line
      line.sub!(/\s*\#.*$/, '')
      comment = $&
      line.gsub!(%r"(\s)(?!\.)([^$(){}+=:\s\\,]+)(?=\s|\z)") {$1 + RULE_SUBST % $2}
      line = line.chomp + comment + "\n" if comment
    end
    depout << line
  end
  depend.each_line do |line|
    line.gsub!(/\.o\b/, ".#{$OBJEXT}")
    line.gsub!(/\{\$\(VPATH\)\}/, "") unless $nmake
    line.gsub!(/\$\((?:hdr|top)dir\)\/config.h/, $config_h)
    line.gsub!(%r"\$\(hdrdir\)/(?!ruby(?![^:;/\s]))(?=[-\w]+\.h)", '\&ruby/')
    if $nmake && /\A\s*\$\(RM|COPY\)/ =~ line
      line.gsub!(%r"[-\w\./]{2,}"){$&.tr("/", "\\")}
      line.gsub!(/(\$\((?!RM|COPY)[^:)]+)(?=\))/, '\1:/=\\')
    end
    if /(?:^|[^\\])(?:\\\\)*\\$/ =~ line
      (cont ||= []) << line
      next
    elsif cont
      line = (cont << line).join
      cont = nil
    end
    ruleconv.call(line)
  end
  if cont
    ruleconv.call(cont.join)
  elsif implicit
    impconv.call
  end
  unless suffixes.empty?
    depout.unshift(".SUFFIXES: ." + suffixes.uniq.join(" .") + "\n\n")
  end
  depout.unshift("$(OBJS): $(RUBY_EXTCONF_H)\n\n") if $extconf_h
  depout.flatten!
  depout
end
dir_config(target) click to toggle source
dir_config(target, prefix)
dir_config(target, idefault, ldefault)

Sets a target name that the user can then use to configure various “with” options with on the command line by using that name. For example, if the target is set to “foo”, then the user could use the --with-foo-dir=prefix, --with-foo-include=dir and --with-foo-lib=dir command line options to tell where to search for header/library files.

You may pass along additional parameters to specify default values. If one is given it is taken as default prefix, and if two are given they are taken as “include” and “lib” defaults in that order.

In any case, the return value will be an array of determined “include” and “lib” directories, either of which can be nil if no corresponding command line option is given when no default value is specified.

Note that #dir_config only adds to the list of places to search for libraries and include files. It does not link the libraries into your application.

# File lib/mkmf.rb, line 1730
def dir_config(target, idefault=nil, ldefault=nil)
  if dir = with_config(target + "-dir", (idefault unless ldefault))
    defaults = Array === dir ? dir : dir.split(File::PATH_SEPARATOR)
    idefault = ldefault = nil
  end

  idir = with_config(target + "-include", idefault)
  $arg_config.last[1] ||= "${#{target}-dir}/include"
  ldir = with_config(target + "-lib", ldefault)
  $arg_config.last[1] ||= "${#{target}-dir}/#{_libdir_basename}"

  idirs = idir ? Array === idir ? idir.dup : idir.split(File::PATH_SEPARATOR) : []
  if defaults
    idirs.concat(defaults.collect {|d| d + "/include"})
    idir = ([idir] + idirs).compact.join(File::PATH_SEPARATOR)
  end
  unless idirs.empty?
    idirs.collect! {|d| "-I" + d}
    idirs -= Shellwords.shellwords($CPPFLAGS)
    unless idirs.empty?
      $CPPFLAGS = (idirs.quote << $CPPFLAGS).join(" ")
    end
  end

  ldirs = ldir ? Array === ldir ? ldir.dup : ldir.split(File::PATH_SEPARATOR) : []
  if defaults
    ldirs.concat(defaults.collect {|d| "#{d}/#{_libdir_basename}"})
    ldir = ([ldir] + ldirs).compact.join(File::PATH_SEPARATOR)
  end
  $LIBPATH = ldirs | $LIBPATH

  [idir, ldir]
end
dummy_makefile(srcdir) click to toggle source

creates a stub Makefile.

# File lib/mkmf.rb, line 2036
  def dummy_makefile(srcdir)
    configuration(srcdir) << <<RULES << CLEANINGS
CLEANFILES = #{$cleanfiles.join(' ')}
DISTCLEANFILES = #{$distcleanfiles.join(' ')}

all install static install-so install-rb: Makefile
.PHONY: all install static install-so install-rb
.PHONY: clean clean-so clean-static clean-rb

RULES
  end
enable_config(config, default=nil) { |config, default| ... } click to toggle source

Tests for the presence of an --enable-config or --disable-config option. Returns true if the enable option is given, false if the disable option is given, and the default value otherwise.

This can be useful for adding custom definitions, such as debug information.

Example:

if enable_config("debug")
   $defs.push("-DOSSL_DEBUG") unless $defs.include? "-DOSSL_DEBUG"
end
# File lib/mkmf.rb, line 1642
def enable_config(config, default=nil)
  if arg_config("--enable-"+config)
    true
  elsif arg_config("--disable-"+config)
    false
  elsif block_given?
    yield(config, default)
  else
    return default
  end
end
find_executable(bin, path = nil) click to toggle source

Searches for the executable bin on path. The default path is your PATH environment variable. If that isn't defined, it will resort to searching /usr/local/bin, /usr/ucb, /usr/bin and /bin.

If found, it will return the full path, including the executable name, of where it was found.

Note that this method does not actually affect the generated Makefile.

# File lib/mkmf.rb, line 1572
def find_executable(bin, path = nil)
  checking_for checking_message(bin, path) do
    find_executable0(bin, path)
  end
end
find_header(header, *paths) click to toggle source

Instructs mkmf to search for the given header in any of the paths provided, and returns whether or not it was found in those paths.

If the header is found then the path it was found on is added to the list of included directories that are sent to the compiler (via the -I switch).

# File lib/mkmf.rb, line 1139
def find_header(header, *paths)
  message = checking_message(header, paths)
  header = cpp_include(header)
  checking_for message do
    if try_header(header)
      true
    else
      found = false
      paths.each do |dir|
        opt = "-I#{dir}".quote
        if try_header(header, opt)
          $INCFLAGS << " " << opt
          found = true
          break
        end
      end
      found
    end
  end
end
find_library(lib, func, *paths, &b) click to toggle source

Returns whether or not the entry point func can be found within the library lib in one of the paths specified, where paths is an array of strings. If func is nil , then the main() function is used as the entry point.

If lib is found, then the path it was found on is added to the list of library paths searched and linked against.

# File lib/mkmf.rb, line 1014
def find_library(lib, func, *paths, &b)
  func = "main" if !func or func.empty?
  lib = with_config(lib+'lib', lib)
  paths = paths.collect {|path| path.split(File::PATH_SEPARATOR)}.flatten
  checking_for checking_message(func.funcall_style, LIBARG%lib) do
    libpath = $LIBPATH
    libs = append_library($libs, lib)
    begin
      until r = try_func(func, libs, &b) or paths.empty?
        $LIBPATH = libpath | [paths.shift]
      end
      if r
        $libs = libs
        libpath = nil
      end
    ensure
      $LIBPATH = libpath if libpath
    end
    r
  end
end
find_type(type, opt, *headers, &b) click to toggle source

Returns where the static type type is defined.

You may also pass additional flags to opt which are then passed along to the compiler.

See also have_type.

# File lib/mkmf.rb, line 1236
def find_type(type, opt, *headers, &b)
  opt ||= ""
  fmt = "not found"
  def fmt.%(x)
    x ? x.respond_to?(:join) ? x.join(",") : x : self
  end
  checking_for checking_message(type, nil, opt), fmt do
    headers.find do |h|
      try_type(type, h, opt, &b)
    end
  end
end
have_const(const, headers = nil, opt = "", &b) click to toggle source

Returns whether or not the constant const is defined. You may optionally pass the type of const as [const, type], such as:

have_const(%w[PTHREAD_MUTEX_INITIALIZER pthread_mutex_t], "pthread.h")

You may also pass additional headers to check against in addition to the common header files, and additional flags to opt which are then passed along to the compiler.

If found, a macro is passed as a preprocessor constant to the compiler using the type name, in uppercase, prepended with HAVE_CONST_.

For example, if have_const('foo') returned true, then the HAVE_CONST_FOO preprocessor macro would be passed to the compiler.

# File lib/mkmf.rb, line 1284
def have_const(const, headers = nil, opt = "", &b)
  checking_for checking_message([*const].compact.join(' '), headers, opt) do
    try_const(const, headers, opt, &b)
  end
end
have_framework(fw, &b) click to toggle source

Returns whether or not the given framework can be found on your system. If found, a macro is passed as a preprocessor constant to the compiler using the framework name, in uppercase, prepended with HAVE_FRAMEWORK_.

For example, if have_framework('Ruby') returned true, then the HAVE_FRAMEWORK_RUBY preprocessor macro would be passed to the compiler.

If fw is a pair of the framework name and its header file name that header file is checked, instead of the normally used header file which is named same as the framework.

# File lib/mkmf.rb, line 1110
def have_framework(fw, &b)
  if Array === fw
    fw, header = *fw
  else
    header = "#{fw}.h"
  end
  checking_for fw do
    src = cpp_include("#{fw}/#{header}") << "\n" "int main(void){return 0;}"
    opt = " -framework #{fw}"
    if try_link(src, opt, &b) or (objc = try_link(src, "-ObjC#{opt}", &b))
      $defs.push(format("-DHAVE_FRAMEWORK_%s", fw.tr_cpp))
      # TODO: non-worse way than this hack, to get rid of separating
      # option and its argument.
      $LDFLAGS << " -ObjC" if objc and /(\A|\s)-ObjC(\s|\z)/ !~ $LDFLAGS
      $LIBS << opt
      true
    else
      false
    end
  end
end
have_func(func, headers = nil, opt = "", &b) click to toggle source

Returns whether or not the function func can be found in the common header files, or within any headers that you provide. If found, a macro is passed as a preprocessor constant to the compiler using the function name, in uppercase, prepended with HAVE_.

To check functions in an additional library, you need to check that library first using have_library(). The func shall be either mere function name or function name with arguments.

For example, if have_func('foo') returned true, then the HAVE_FOO preprocessor macro would be passed to the compiler.

# File lib/mkmf.rb, line 1048
def have_func(func, headers = nil, opt = "", &b)
  checking_for checking_message(func.funcall_style, headers, opt) do
    if try_func(func, $libs, headers, opt, &b)
      $defs << "-DHAVE_#{func.sans_arguments.tr_cpp}"
      true
    else
      false
    end
  end
end
have_header(header, preheaders = nil, opt = "", &b) click to toggle source

Returns whether or not the given header file can be found on your system. If found, a macro is passed as a preprocessor constant to the compiler using the header file name, in uppercase, prepended with HAVE_.

For example, if have_header('foo.h') returned true, then the HAVE_FOO_H preprocessor macro would be passed to the compiler.

# File lib/mkmf.rb, line 1088
def have_header(header, preheaders = nil, opt = "", &b)
  checking_for header do
    if try_header(cpp_include(preheaders)+cpp_include(header), opt, &b)
      $defs.push(format("-DHAVE_%s", header.tr_cpp))
      true
    else
      false
    end
  end
end
have_library(lib, func = nil, headers = nil, opt = "", &b) click to toggle source

Returns whether or not the given entry point func can be found within lib. If func is nil, the main() entry point is used by default. If found, it adds the library to list of libraries to be used when linking your extension.

If headers are provided, it will include those header files as the header files it looks in when searching for func.

The real name of the library to be linked can be altered by --with-FOOlib configuration option.

# File lib/mkmf.rb, line 988
def have_library(lib, func = nil, headers = nil, opt = "", &b)
  func = "main" if !func or func.empty?
  lib = with_config(lib+'lib', lib)
  checking_for checking_message(func.funcall_style, LIBARG%lib, opt) do
    if COMMON_LIBS.include?(lib)
      true
    else
      libs = append_library($libs, lib)
      if try_func(func, libs, headers, opt, &b)
        $libs = libs
        true
      else
        false
      end
    end
  end
end
have_macro(macro, headers = nil, opt = "", &b) click to toggle source

Returns whether or not macro is defined either in the common header files or within any headers you provide.

Any options you pass to opt are passed along to the compiler.

# File lib/mkmf.rb, line 971
def have_macro(macro, headers = nil, opt = "", &b)
  checking_for checking_message(macro, headers, opt) do
    macro_defined?(macro, cpp_include(headers), opt, &b)
  end
end
have_struct_member(type, member, headers = nil, opt = "", &b) click to toggle source

Returns whether or not the struct of type type contains member. If it does not, or the struct type can't be found, then false is returned. You may optionally specify additional headers in which to look for the struct (in addition to the common header files).

If found, a macro is passed as a preprocessor constant to the compiler using the type name and the member name, in uppercase, prepended with HAVE_.

For example, if have_struct_member('struct foo', 'bar') returned true, then the HAVE_STRUCT_FOO_BAR preprocessor macro would be passed to the compiler.

HAVE_ST_BAR is also defined for backward compatibility.

# File lib/mkmf.rb, line 1175
  def have_struct_member(type, member, headers = nil, opt = "", &b)
    checking_for checking_message("#{type}.#{member}", headers) do
      if try_compile(<<"SRC", opt, &b)
#{cpp_include(headers)}
/*top*/
int s = (char *)&((#{type}*)0)->#{member} - (char *)0;
#{MAIN_DOES_NOTHING}
SRC
        $defs.push(format("-DHAVE_%s_%s", type.tr_cpp, member.tr_cpp))
        $defs.push(format("-DHAVE_ST_%s", member.tr_cpp)) # backward compatibility
        true
      else
        false
      end
    end
  end
have_type(type, headers = nil, opt = "", &b) click to toggle source

Returns whether or not the static type type is defined. You may optionally pass additional headers to check against in addition to the common header files.

You may also pass additional flags to opt which are then passed along to the compiler.

If found, a macro is passed as a preprocessor constant to the compiler using the type name, in uppercase, prepended with HAVE_TYPE_.

For example, if have_type('foo') returned true, then the HAVE_TYPE_FOO preprocessor macro would be passed to the compiler.

# File lib/mkmf.rb, line 1223
def have_type(type, headers = nil, opt = "", &b)
  checking_for checking_message(type, headers, opt) do
    try_type(type, headers, opt, &b)
  end
end
have_var(var, headers = nil, opt = "", &b) click to toggle source

Returns whether or not the variable var can be found in the common header files, or within any headers that you provide. If found, a macro is passed as a preprocessor constant to the compiler using the variable name, in uppercase, prepended with HAVE_.

To check variables in an additional library, you need to check that library first using have_library().

For example, if have_var('foo') returned true, then the HAVE_FOO preprocessor macro would be passed to the compiler.

# File lib/mkmf.rb, line 1070
def have_var(var, headers = nil, opt = "", &b)
  checking_for checking_message(var, headers, opt) do
    if try_var(var, headers, opt, &b)
      $defs.push(format("-DHAVE_%s", var.tr_cpp))
      true
    else
      false
    end
  end
end
pkg_config(pkg, option=nil) click to toggle source

Returns compile/link information about an installed library in a tuple of [cflags, ldflags, libs], by using the command found first in the following commands:

  1. If --with-{pkg}-config={command} is given via command line option: {command} {option}

  2. {pkg}-config {option}

  3. pkg-config {option} {pkg}

Where {option} is, for instance, --cflags.

The values obtained are appended to +$CFLAGS+, +$LDFLAGS+ and +$libs+.

If an option argument is given, the config command is invoked with the option and a stripped output string is returned without modifying any of the global values mentioned above.

# File lib/mkmf.rb, line 1783
def pkg_config(pkg, option=nil)
  if pkgconfig = with_config("#{pkg}-config") and find_executable0(pkgconfig)
    # iff package specific config command is given
  elsif ($PKGCONFIG ||=
         (pkgconfig = with_config("pkg-config", ("pkg-config" unless CROSS_COMPILING))) &&
         find_executable0(pkgconfig) && pkgconfig) and
      xsystem("#{$PKGCONFIG} --exists #{pkg}")
    # default to pkg-config command
    pkgconfig = $PKGCONFIG
    get = proc {|opt|
      opt = xpopen("#{$PKGCONFIG} --#{opt} #{pkg}", err:[:child, :out], &:read)
      Logging.open {puts opt.each_line.map{|s|"=> #{s.inspect}"}}
      opt.strip if $?.success?
    }
  elsif find_executable0(pkgconfig = "#{pkg}-config")
    # default to package specific config command, as a last resort.
  else
    pkgconfig = nil
  end
  if pkgconfig
    get ||= proc {|opt|
      opt = xpopen("#{pkgconfig} --#{opt}", err:[:child, :out], &:read)
      Logging.open {puts opt.each_line.map{|s|"=> #{s.inspect}"}}
      opt.strip if $?.success?
    }
  end
  orig_ldflags = $LDFLAGS
  if get and option
    get[option]
  elsif get and try_ldflags(ldflags = get['libs'])
    if incflags = get['cflags-only-I']
      $INCFLAGS << " " << incflags
      cflags = get['cflags-only-other']
    else
      cflags = get['cflags']
    end
    libs = get['libs-only-l']
    if cflags
      $CFLAGS += " " << cflags
      $CXXFLAGS += " " << cflags
    end
    if libs
      ldflags = (Shellwords.shellwords(ldflags) - Shellwords.shellwords(libs)).quote.join(" ")
    else
      libs, ldflags = Shellwords.shellwords(ldflags).partition {|s| s =~ /-l([^ ]+)/ }.map {|l|l.quote.join(" ")}
    end
    $libs += " " << libs

    $LDFLAGS = [orig_ldflags, ldflags].join(' ')
    Logging::message "package configuration for %s\n", pkg
    Logging::message "cflags: %s\nldflags: %s\nlibs: %s\n\n",
                     cflags, ldflags, libs
    [cflags, ldflags, libs]
  else
    Logging::message "package configuration for %s is not found\n", pkg
    nil
  end
end
try_const(const, headers = nil, opt = "", &b) click to toggle source

Returns whether or not the constant const is defined.

See also have_const

# File lib/mkmf.rb, line 1253
  def try_const(const, headers = nil, opt = "", &b)
    const, type = *const
    if try_compile(<<"SRC", opt, &b)
#{cpp_include(headers)}
/*top*/
typedef #{type || 'int'} conftest_type;
conftest_type conftestval = #{type ? '' : '(int)'}#{const};
SRC
      $defs.push(format("-DHAVE_CONST_%s", const.tr_cpp))
      true
    else
      false
    end
  end
try_type(type, headers = nil, opt = "", &b) click to toggle source

Returns whether or not the static type type is defined.

See also have_type

# File lib/mkmf.rb, line 1196
  def try_type(type, headers = nil, opt = "", &b)
    if try_compile(<<"SRC", opt, &b)
#{cpp_include(headers)}
/*top*/
typedef #{type} conftest_type;
int conftestval[sizeof(conftest_type)?1:-1];
SRC
      $defs.push(format("-DHAVE_TYPE_%s", type.tr_cpp))
      true
    else
      false
    end
  end
with_config(config, default=nil) { |config, default| ... } click to toggle source

Tests for the presence of a --with-config or --without-config option. Returns true if the with option is given, false if the without option is given, and the default value otherwise.

This can be useful for adding custom definitions, such as debug information.

Example:

if with_config("debug")
   $defs.push("-DOSSL_DEBUG") unless $defs.include? "-DOSSL_DEBUG"
end
# File lib/mkmf.rb, line 1607
def with_config(config, default=nil)
  config = config.sub(/^--with[-_]/, '')
  val = arg_config("--with-"+config) do
    if arg_config("--without-"+config)
      false
    elsif block_given?
      yield(config, default)
    else
      break default
    end
  end
  case val
  when "yes"
    true
  when "no"
    false
  else
    val
  end
end