From: Guillaume Marcais <guslist@...>
Date: 2003-08-31T08:51:33+09:00
Subject: mkmf & swig


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As I started to play with SWIG, I did a quick modification of mkmf so it
supports SWIG (see attached diff). An extconf.rb file would look like:

require 'mkmf'
use_swig
create_makefile('example')

Then, the usual:
$ ruby extconf.rb
$ make

should do.

In addition, there is a 'swig' rule to trigger swig ("make swig"). So
that one can generate the C files and distribute a tarball that doesn't
require SWIG.

"make distclean" gets ride of the C files generated by swig.

That's it. It is fairly simple and has plenty of shortcomings. For
example, it doesn't support C++ source file.
Is it of interest to anybody? Should mkmf in the standard distribution
supports SWIG and other tools (like Racc)?

Guillaume.

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--- mkmf.rb	Tue Jul 22 12:30:05 2003
+++ mkmf-swig.rb	Sat Aug 30 19:23:50 2003
@@ -9,6 +9,7 @@
 ORIG_LIBPATH =3D ENV['LIB']
=20
 SRC_EXT =3D ["c", "cc", "m", "cxx", "cpp", "C"]
+ADD_SUFFIXES =3D []
 $static =3D $config_h =3D nil
=20
 unless defined? $configure_args
@@ -103,6 +104,11 @@
   end
 end
=20
+def use_swig(swig =3D "swig", swig_flags =3D "-ruby")
+  CONFIG["SWIG"] =3D with_config("swig", swig)
+  CONFIG["SWIG_FLAGS"] =3D with_config("swig-flags", swig_flags)
+end
+
 def rm_f(*files)
   FileUtils.rm_f(Dir[files.join("\0")])
 end
@@ -580,6 +586,8 @@
 MAKEDIRS =3D $(RUBY) -r ftools -e 'File::makedirs(*ARGV)'
 INSTALL_PROG =3D $(RUBY) -r ftools -e 'File::install(ARGV[0], ARGV[1], 075=
5, true)'
 INSTALL_DATA =3D $(RUBY) -r ftools -e 'File::install(ARGV[0], ARGV[1], 064=
4, true)'
+#{"\nSWIG =3D " + CONFIG["SWIG"] if CONFIG["SWIG"]}
+#{"SWIG_FLAGS =3D " + CONFIG["SWIG_FLAGS"] if CONFIG["SWIG_FLAGS"]}
=20
 #### End of system configuration section. ####
=20
@@ -627,6 +635,13 @@
     for f in Dir[File.join(srcdir, "*.{#{SRC_EXT.join(%q{,})}}")]
       $objs.push(File.basename(f, ".*") << "." << $OBJEXT)
     end
+    if CONFIG["SWIG"]
+      $swig_objs =3D []
+      for f in Dir[File.join(srcdir, "*.i")]
+        $swig_objs.push(File.basename(f, ".*") << "_wrap." << $OBJEXT)
+      end
+      $objs +=3D $swig_objs
+    end
   else
     for i in $objs
       i.sub!(/\.o\z/, ".#{$OBJEXT}")
@@ -668,6 +683,14 @@
   dllib =3D target ? "$(TARGET).#{$static ? $LIBEXT : CONFIG['DLEXT']}" : =
""
   mfile =3D open("Makefile", "wb")
   mfile.print configuration(srcdir)
+
+  if CONFIG["SWIG"]
+    mfile.print %{
+SWIG_SRC =3D #{$swig_objs.collect { |x| x.gsub(/\.#{$OBJEXT}$/, ".c")}}
+}
+    $distcleanfiles << "$(SWIG_SRC)"
+  end
+
   mfile.print %{
 LIBPATH =3D #{libpath}
 DEFFILE =3D #{deffile}
@@ -735,7 +758,9 @@
=20
   return unless target
=20
-  mfile.print ".SUFFIXES: .#{SRC_EXT.join(' .')} .#{$OBJEXT}\n"
+  ADD_SUFFIXES << "i" if CONFIG["SWIG"]
+
+  mfile.print ".SUFFIXES: .#{(SRC_EXT+ADD_SUFFIXES).join(' .')} .#{$OBJEXT=
}\n"
   mfile.print "\n"
=20
   %w[cc cpp cxx C].each do |ext|
@@ -751,6 +776,11 @@
     end
   end
=20
+  if CONFIG["SWIG"]
+    mfile.print("$(SWIG_SRC): %_wrap.c: %.i\n\t$(SWIG) $(SWIG_FLAGS) $<\n\=
n")
+  end
+
+
   mfile.print "$(DLLIB): $(OBJS)\n\t"
   mfile.print "@-$(RM) $@\n\t"
   mfile.print "@-$(RM) $(TARGET).lib\n\t" if $mswin
@@ -810,6 +840,9 @@
   $distcleanfiles =3D []
  =20
   dir_config("opt")
+
+  config["SWIG"] =3D nil
+  config["SWIG_FLAGS"] =3D nil
 end
=20
 init_mkmf

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