Add a section to mkfiles.pl to build a makefile that compiles the OS X

front end using GNUstep, yielding a Unix program built from the same
code. Should make it easier to check OS X behaviour without having to
move as far as a Mac :-) However, it doesn't compile as is, so I'll
apply fixes to the code until it does.

[originally from svn r9498]

Recipe

@@ -13,6 +13,7 @@
 !makefile wce Makefile.wce
 !makefile cygwin Makefile.cyg
 !makefile osx Makefile.osx
+!makefile gnustep Makefile.gnustep
 !makefile nestedvm Makefile.nestedvm
 
 !srcdir icons/

mkfiles.pl

@@ -287,7 +287,7 @@ sub mfval($) {
     # Returns true if the argument is a known makefile type. Otherwise,
     # prints a warning and returns false;
     if (grep { $type eq $_ }
-	("vc","vcproj","cygwin","borland","lcc","gtk","mpw","nestedvm","osx","wce")) {
+	("vc","vcproj","cygwin","borland","lcc","gtk","mpw","nestedvm","osx","wce","gnustep")) {
 	    return 1;
 	}
     warn "$.:unknown makefile type '$type'\n";
@@ -1501,3 +1501,90 @@ if (defined $makefiles{'osx'}) {
     "\trm -rf *.app\n";
     select STDOUT; close OUT;
 }
+
+if (defined $makefiles{'gnustep'}) {
+    $mftyp = 'gnustep';
+    $dirpfx = &dirpfx($makefiles{'gnustep'}, "/");
+
+    ##-- GNUstep makefile (use with 'gs_make -f Makefile.gnustep')
+
+    # This is a pretty evil way to do things. In an ideal world, I'd
+    # use the approved GNUstep makefile mechanism which just defines a
+    # variable or two saying what source files go into what binary and
+    # then includes application.make. Unfortunately, that has the
+    # automake-ish limitation that it doesn't let you choose different
+    # command lines for each object, so I can't arrange for all those
+    # files with -DTHIS and -DTHAT to Just Work.
+    #
+    # A simple if ugly fix would be to have mkfiles.pl construct a
+    # directory full of stub C files of the form '#define thing',
+    # '#include "real_source_file"', and then reference those in this
+    # makefile. That would also make it easy to build a proper
+    # automake makefile.
+    open OUT, ">$makefiles{'gnustep'}"; select OUT;
+    print
+    "# Makefile for $project_name under GNUstep.\n".
+    "#\n# This file was created by `mkfiles.pl' from the `Recipe' file.\n".
+    "# DO NOT EDIT THIS FILE DIRECTLY; edit Recipe or mkfiles.pl instead.\n";
+    # gcc command line option is -D not /D
+    ($_ = $help) =~ s/=\/D/=-D/gs;
+    print $_;
+    print
+    "NEEDS_GUI=yes\n".
+    "include \$(GNUSTEP_MAKEFILES)/common.make\n".
+    "include \$(GNUSTEP_MAKEFILES)/rules.make\n".
+    "include \$(GNUSTEP_MAKEFILES)/Instance/rules.make\n".
+    "\n".
+    &splitline("all::" . join "", map { " $_" } &progrealnames("MX:U")) .
+    "\n";
+    print $makefile_extra{'gnustep'} || "";
+    print "\n".
+    ".SUFFIXES: .o .c .m\n".
+    "\n";
+    print "\n\n";
+    foreach $p (&prognames("MX")) {
+      ($prog, $type) = split ",", $p;
+      $icon = &special($p, ".icns");
+      $infoplist = &special($p, "info.plist");
+      print "${prog}.app:\n\tmkdir -p \$\@\n";
+      $targets = "${prog}.app ${prog}.app/$prog";
+      if (defined $icon) {
+	print "${prog}.app/Resources: ${prog}.app\n\tmkdir -p \$\@\n";
+	print "${prog}.app/Resources/${prog}.icns: ${prog}.app/Resources $icon\n\tcp $icon \$\@\n";
+	$targets .= " ${prog}.app/Resources/${prog}.icns";
+      }
+      if (defined $infoplist) {
+	print "${prog}.app/Info.plist: ${prog}.app $infoplist\n\tcp $infoplist \$\@\n";
+	$targets .= " ${prog}.app/Info.plist";
+      }
+      $targets .= " \$(${prog}_extra)";
+      print &splitline("${prog}: $targets", 69) . "\n\n";
+      $libstr = &objects($p, undef, undef, "-lX");
+      $objstr = &objects($p, "X.o", undef, undef);
+      print &splitline("${prog}.app/$prog: " . $objstr), "\n";
+      print &splitline("\t\$(CC) \$(ALL_LDFLAGS) -o \$@ " . $objstr . " \$(ALL_LIB_DIRS) $libstr \$(ALL_LIBS)", 69), "\n\n";
+    }
+    foreach $p (&prognames("U")) {
+      ($prog, $type) = split ",", $p;
+      $libstr = &objects($p, undef, undef, "-lX");
+      $objstr = &objects($p, "X.o", undef, undef);
+      print &splitline("${prog}: " . $objstr), "\n";
+      print &splitline("\t\$(CC) \$(ULDFLAGS) -o \$@ " . $objstr . " $libstr", 69), "\n\n";
+    }
+    foreach $d (&deps("X.o", undef, $dirpfx, "/")) {
+      print &splitline(sprintf("%s: %s", $d->{obj}, join " ", @{$d->{deps}})),
+      "\n";
+      $deflist = join "", map { " -D$_" } @{$d->{defs}};
+      if ($d->{deps}->[0] =~ /\.m$/) {
+        print "\t\$(CC) -DGNUSTEP \$(ALL_OBJCFLAGS) \$(COMPAT) \$(FWHACK) \$(OBJCFLAGS)".
+                " \$(XFLAGS)$deflist -c \$< -o \$\@\n";
+      } else {
+        print "\t\$(CC) \$(ALL_CFLAGS) \$(COMPAT) \$(FWHACK) \$(CFLAGS) \$(XFLAGS)$deflist" .
+              " -c \$< -o \$\@\n";
+      }
+    }
+    print "\nclean::\n".
+    "\trm -f *.o ". (join " ", &progrealnames("U")) . "\n".
+    "\trm -rf *.app\n";
+    select STDOUT; close OUT;
+}