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check_sizeof(type, headers = nil, &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 mkmf.rb, line 912
def check_sizeof(type, headers = nil, &b)
  expr = "sizeof(#{type})"
  fmt = "%d"
  def fmt.%(x)
    x ? super : "failed"
  end
  checking_for checking_message("size of #{type}", headers), fmt do
    if size = try_constant(expr, headers, &b)
      $defs.push(format("-DSIZEOF_%s=%d", type.tr_cpp, size))
      size
    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 mkmf.rb, line 1120
def create_header(header = "extconf.h")
  message "creating %s\n", header
  sym = header.tr("a-z./\055", "A-Z___")
  hdr = ["#ifndef #{sym}\n#define #{sym}\n"]
  for line in $defs
    case line
    when /^-D([^=]+)(?:=(.*))?/
      hdr << "#define #$1 #{$2 ? Shellwords.shellwords($2)[0] : 1}\n"
    when /^-U(.*)/
      hdr << "#undef #$1\n"
    end
  end
  hdr << "#endif\n"
  hdr = hdr.join
  unless (IO.read(header) == hdr rescue false)
    open(header, "w") do |hfile|
      hfile.write(hdr)
    end
  end
  $extconf_h = header
end
            
create_makefile(target, srcprefix = nil) 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 Config::CONFIG 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 mkmf.rb, line 1422
def create_makefile(target, srcprefix = nil)
  $target = target
  libpath = $DEFLIBPATH|$LIBPATH
  message "creating Makefile\n"
  rm_f "conftest*"
  if CONFIG["DLEXT"] == $OBJEXT
    for lib in libs = $libs.split
      lib.sub!(/-l(.*)/, %Q"lib\\1.#{$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)'
  Config::expand(srcdir = srcprefix.dup)

  if not $objs
    $objs = []
    srcs = Dir[File.join(srcdir, "*.{#{SRC_EXT.join(%q{,})}}")]
    for f in srcs
      obj = File.basename(f, ".*") << ".o"
      $objs.push(obj) unless $objs.index(obj)
    end
  elsif !(srcs = $srcs)
    srcs = $objs.collect {|obj| obj.sub(/\.o\z/, '.c')}
  end
  $srcs = srcs
  for i in $objs
    i.sub!(/\.o\z/, ".#{$OBJEXT}")
  end
  $objs = $objs.join(" ")

  target = nil if $objs == ""

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

  libpath = libpathflag(libpath)

  dllib = target ? "$(TARGET).#{CONFIG['DLEXT']}" : ""
  staticlib = target ? "$(TARGET).#$LIBEXT" : ""
  mfile = open("Makefile", "wb")
  mfile.print configuration(srcprefix)
  mfile.print "
libpath = #{($DEFLIBPATH|$LIBPATH).join(" ")}
LIBPATH = #{libpath}
DEFFILE = #{deffile}

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

extout = #{$extout}
extout_prefix = #{$extout_prefix}
target_prefix = #{target_prefix}
LOCAL_LIBS = #{$LOCAL_LIBS}
LIBS = #{$LIBRUBYARG} #{$libs} #{$LIBS}
SRCS = #{srcs.collect(&File.method(:basename)).join(' ')}
OBJS = #{$objs}
TARGET = #{target}
DLLIB = #{dllib}
EXTSTATIC = #{$static || ""}
STATIC_LIB = #{staticlib unless $static.nil?}
#{!$extout && defined?($installed_list) ? "INSTALLED_LIST = #{$installed_list}\n" : ""}
"
  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']} #{n}il? #{n}tds #{n}map
CLEANOBJS     = *.#{$OBJEXT} *.#{$LIBEXT} *.s[ol] *.pdb *.exp *.bak

all:            #{$extout ? "install" : target ? "$(DLLIB)" : "Makefile"}
static:         $(STATIC_LIB)#{$extout ? " install-rb" : ""}
"
  mfile.print CLEANINGS
  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}"
    mfile.puts dir, "install-so: #{dest}"
    unless $extout
      mfile.print "#{dest}: #{f}\n"
      if (sep = config_string('BUILD_FILE_SEPARATOR'))
        f.gsub!("/", sep)
        dir.gsub!("/", sep)
        sep = ":/="+sep
        f.gsub!(/(\$\(\w+)(\))/) {$1+sep+$2}
        f.gsub!(/(\$\{\w+)(\})/) {$1+sep+$2}
        dir.gsub!(/(\$\(\w+)(\))/) {$1+sep+$2}
        dir.gsub!(/(\$\{\w+)(\})/) {$1+sep+$2}
      end
      mfile.print "\t$(INSTALL_PROG) #{f} #{dir}\n"
      if defined?($installed_list)
        mfile.print "\t@echo #{dir}/#{File.basename(f)}>>$(INSTALLED_LIST)\n"
      end
    end
  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"]]], ["", $INSTALLFILES]]
    files = install_files(mfile, i, nil, srcprefix) or next
    for dir, *files in files
      unless dirs.include?(dir)
        dirs << dir
        mfile.print "pre-install-rb#{sfx}: #{dir}\n"
      end
      files.each do |f|
        dest = "#{dir}/#{File.basename(f)}"
        mfile.print("install-rb#{sfx}: #{dest}\n")
        mfile.print("#{dest}: #{f} #{dir}\n\t$(#{$extout ? 'COPY' : 'INSTALL_DATA'}) ")
        sep = config_string('BUILD_FILE_SEPARATOR')
        if sep
          f = f.gsub("/", sep)
          sep = ":/="+sep
          f = f.gsub(/(\$\(\w+)(\))/) {$1+sep+$2}
          f = f.gsub(/(\$\{\w+)(\})/) {$1+sep+$2}
        else
          sep = ""
        end
        mfile.print("#{f} $(@D#{sep})\n")
        if defined?($installed_list) and !$extout
          mfile.print("\t@echo #{dest}>>$(INSTALLED_LIST)\n")
        end
      end
    end
  end
  dirs.unshift(sodir) if target and !dirs.include?(sodir)
  dirs.each {|dir| mfile.print "#{dir}:\n\t$(MAKEDIRS) $@\n"}

  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 {|ext| ".path.#{ext} = $(VPATH)"} if $nmake == ?b
  mfile.print ".SUFFIXES: .#{SRC_EXT.join(' .')} .#{$OBJEXT}\n"
  mfile.print "\n"

  CXX_EXT.each do |ext|
    COMPILE_RULES.each do |rule|
      mfile.printf(rule, ext, $OBJEXT)
      mfile.printf("\n\t%s\n\n", COMPILE_CXX)
    end
  end
  %w[c].each do |ext|
    COMPILE_RULES.each do |rule|
      mfile.printf(rule, ext, $OBJEXT)
      mfile.printf("\n\t%s\n\n", COMPILE_C)
    end
  end

  mfile.print "$(RUBYARCHDIR)/" if $extout
  mfile.print "$(DLLIB): "
  mfile.print "$(DEFFILE) " if makedef
  mfile.print "$(OBJS) Makefile\n"
  mfile.print "\t@-$(RM) $@\n"
  mfile.print "\t@-$(MAKEDIRS) $(@D)\n" if $extout
  link_so = LINK_SO.gsub(/^/, "\t")
  mfile.print link_so, "\n\n"
  unless $static.nil?
    mfile.print "$(STATIC_LIB): $(OBJS)\n\t"
    mfile.print "$(AR) #{config_string('ARFLAGS') || 'cru '}$@ $(OBJS)"
    config_string('RANLIB') do |ranlib|
      mfile.print "\n\t@-#{ranlib} $(DLLIB) 2> /dev/null || true"
    end
  end
  mfile.print "\n\n"
  if makedef
    mfile.print "$(DEFFILE): #{origdef}\n"
    mfile.print "\t$(RUBY) #{makedef} #{origdef} > $@\n\n"
  end

  depend = File.join(srcdir, "depend")
  if File.exist?(depend)
    suffixes = []
    depout = []
    open(depend, "r") do |dfile|
      mfile.printf "###\n"
      cont = implicit = nil
      impconv = proc do
        COMPILE_RULES.each {|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*=)[$\w][^#]*:/ =~ line
          line.gsub!(%r(\s)(?!\.)([^$(){}+=:\s\/\,]+)(?=\s|\z)") {$1 + RULE_SUBST % $2}
        end
        depout << line
      end
      while line = dfile.gets()
        line.gsub!(/\.o\b/, ".#{$OBJEXT}")
        line.gsub!(/\$\((?:hdr|top)dir\)\/config.h/, $config_h) if $config_h
        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
    end
    unless suffixes.empty?
      mfile.print ".SUFFIXES: .", suffixes.uniq.join(" ."), "\n\n"
    end
    mfile.print "$(OBJS): $(RUBY_EXTCONF_H)\n\n" if $extconf_h
    mfile.print depout
  else
    headers = %w[ruby.h defines.h]
    if RULE_SUBST
      headers.each {|h| h.sub!(/.*/) {|*m| RULE_SUBST % m}}
    end
    headers << $config_h if $config_h
    headers << "$(RUBY_EXTCONF_H)" if $extconf_h
    mfile.print "$(OBJS): ", headers.join(' '), "\n"
  end

  $makefile_created = true
ensure
  mfile.close if mfile
end
            
dir_config(target, idefault=nil, ldefault=nil) click to toggle source

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 command line option.

You may pass along additional ‘include’ or ‘lib’ defaults via the idefault and ldefault parameters, respectively.

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 mkmf.rb, line 1153
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}/lib"

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

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

  [idir, ldir]
end
            
enable_config(config, *defaults) 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 mkmf.rb, line 1082
def enable_config(config, *defaults)
  if arg_config("--enable-"+config)
    true
  elsif arg_config("--disable-"+config)
    false
  elsif block_given?
    yield(config, *defaults)
  else
    return *defaults
  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 mkmf.rb, line 1021
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 mkmf.rb, line 761
def find_header(header, *paths)
  message = checking_message(header, paths)
  header = cpp_include(header)
  checking_for message do
    if try_cpp(header)
      true
    else
      found = false
      paths.each do |dir|
        opt = "-I#{dir}".quote
        if try_cpp(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 mkmf.rb, line 677
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 "#{func}() in #{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 mkmf.rb, line 851
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], like 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 mkmf.rb, line 896
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_func(func, headers = nil, &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_’.

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

 
               # File mkmf.rb, line 707
def have_func(func, headers = nil, &b)
  checking_for checking_message("#{func}()", headers) do
    if try_func(func, $libs, headers, &b)
      $defs.push(format("-DHAVE_%s", func.tr_cpp))
      true
    else
      false
    end
  end
end
            
have_header(header, &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 mkmf.rb, line 744
def have_header(header, &b)
  checking_for header do
    if try_cpp(cpp_include(header), &b)
      $defs.push(format("-DHAVE_%s", header.tr("a-z./\055", "A-Z___")))
      true
    else
      false
    end
  end
end
            
have_library(lib, func = nil, headers = nil, &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 mkmf.rb, line 652
def have_library(lib, func = nil, headers = nil, &b)
  func = "main" if !func or func.empty?
  lib = with_config(lib+'lib', lib)
  checking_for checking_message("#{func}()", LIBARG%lib) do
    if COMMON_LIBS.include?(lib)
      true
    else
      libs = append_library($libs, lib)
      if try_func(func, libs, headers, &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 mkmf.rb, line 635
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, &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 member name, in uppercase, prepended with ‘HAVE_ST_’.

For example, if #have_struct_member(‘struct foo’, ‘bar’) returned true, then the HAVE_ST_BAR preprocessor macro would be passed to the compiler.

 
               # File mkmf.rb, line 793
def have_struct_member(type, member, headers = nil, &b)
  checking_for checking_message("#{type}.#{member}", headers) do
    if try_compile("#{COMMON_HEADERS}
#{cpp_include(headers)}
/*top*/
int main() { return 0; }
int s = (char *)&((#{type}*)0)->#{member} - (char *)0;
", &b)
      $defs.push(format("-DHAVE_ST_%s", member.tr_cpp))
      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 mkmf.rb, line 838
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, &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_’.

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

 
               # File mkmf.rb, line 726
def have_var(var, headers = nil, &b)
  checking_for checking_message(var, headers) do
    if try_var(var, headers, &b)
      $defs.push(format("-DHAVE_%s", var.tr_cpp))
      true
    else
      false
    end
  end
end
            
try_const(const, headers = nil, opt = "", &b) click to toggle source
 
               # File mkmf.rb, line 864
def try_const(const, headers = nil, opt = "", &b)
  const, type = *const
  if try_compile("#{COMMON_HEADERS}
#{cpp_include(headers)}
/*top*/
typedef #{type || 'int'} conftest_type;
conftest_type conftestval = #{type ? '' : '(int)'}#{const};
", opt, &b)
    $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
 
               # File mkmf.rb, line 810
def try_type(type, headers = nil, opt = "", &b)
  if try_compile("#{COMMON_HEADERS}
#{cpp_include(headers)}
/*top*/
typedef #{type} conftest_type;
int conftestval[sizeof(conftest_type)?1:-1];
", opt, &b)
    $defs.push(format("-DHAVE_TYPE_%s", type.tr_cpp))
    true
  else
    false
  end
end
            
with_config(config, *defaults) 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 mkmf.rb, line 1049
def with_config(config, *defaults)
  config = config.sub(/^--with[-_]/, '')
  val = arg_config("--with-"+config) do
    if arg_config("--without-"+config)
      false
    elsif block_given?
      yield(config, *defaults)
    else
      break *defaults
    end
  end
  case val
  when "yes"
    true
  when "no"
    false
  else
    val
  end
end
            

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