[xml] Move to "Experimental" target language status

The XML target language support is not in good shape and is likely to be
removed unless somebody steps up to bring it up to the expected standard
(it fails to even meet the criteria for "Experimental" currently).

Closes #2213

CHANGES.current

@@ -7,6 +7,12 @@ the issue number to the end of the URL: https://github.com/swig/swig/issues/
 Version 4.1.0 (in progress)
 ===========================
 
+2022-07-07: olly
+	    [xml] #2213 XML has been moved to "Experimental" target language
+	    status. It's not in good shape and is likely to be removed unless
+	    somebody steps up to bring it up to the expected standard (it fails
+	    to even meet the criteria for "Experimental" currently).
+
 2022-07-07: jmarrec
 	    #1158 #2286 Add basic support for C++11 attributes.  These are now
 	    crudely ignored by SWIG's parser's tokeniser, which is better that

Doc/Manual/SWIG.html

@@ -134,11 +134,11 @@ Supported Target Language Options
      -ruby           - Generate Ruby wrappers
      -scilab         - Generate Scilab wrappers
      -tcl8           - Generate Tcl 8 wrappers
-     -xml            - Generate XML wrappers
 
 Experimental Target Language Options
      -mzscheme       - Generate MzScheme/Racket wrappers
      -ocaml          - Generate OCaml wrappers
+     -xml            - Generate XML wrappers
 
 General Options
      -addextern      - Add extra extern declarations

Examples/xml/Makefile.in

@@ -5,9 +5,11 @@ top_srcdir	= @top_srcdir@
 top_builddir	= @top_builddir@
 
 SWIGEXE         = $(top_builddir)/swig
+# Suppress "experimental target language" warning
+SWIGOPT         = -w524
 SWIG_LIB_DIR    = $(top_srcdir)/Lib
 SWIG_LIB_SET    = @SWIG_LIB_SET@
-SWIGINVOKE      = $(SWIG_LIB_SET) $(SWIGTOOL) $(SWIGEXE)
+SWIGINVOKE      = $(SWIG_LIB_SET) $(SWIGTOOL) $(SWIGEXE) $(SWIGOPT)
 
 cleanup		= tail +2 \
 		  | sed -e 's/ident="ID[0-9A-F]*"//g' \

RELEASENOTES

@@ -14,6 +14,7 @@ SWIG-4.1.0 summary:
 - Common cases of `<` and `>` comparisons in constant expressions are now
   supported.
 - GitHub Actions is now used instead of Travis CI for continuous integration.
+- The "XML" target language has been reclassified as "Experimental".
 
 SWIG-4.0.2 summary:
 - A few fixes around doxygen comment handling.

Source/Modules/swigmain.cxx

@@ -80,7 +80,7 @@ static TargetLanguageModule modules[] = {
   {"-tcl", swig_tcl, NULL, Supported},
   {"-tcl8", swig_tcl, "Tcl 8", Supported},
   {"-uffi", NULL, "Common Lisp / UFFI", Disabled},
-  {"-xml", swig_xml, "XML", Supported},
+  {"-xml", swig_xml, "XML", Experimental},
   {NULL, NULL, NULL, Disabled}
 };