The default is now to not generate an additional method declaration when a method is declared with an extern. Use -addextern option to recreate original behaviour (new commandline option), with -noextern now redundant.

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk/SWIG@7318 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Source/Include/swigwarn.h

@@ -43,6 +43,7 @@
 #define WARN_DEPRECATED_IGNORE_TM     119
 #define WARN_DEPRECATED_OPTC          120
 #define WARN_DEPRECATED_NAME          121
+#define WARN_DEPRECATED_NOEXTERN      122
 
 /* -- Preprocessor -- */
 

Source/Modules/lang.cxx

@@ -62,7 +62,7 @@ int             SmartPointer = 0;
 
 extern    int           GenerateDefault;
 extern    int           ForceExtern;
-extern    int           NoExtern;
+extern    int           AddExtern;
 
 /* import modes */
 
@@ -799,40 +799,43 @@ int Language::cDeclaration(Node *n) {
     /* Transform the node into a 'function' node and emit */
     if (!CurrentClass) {
       f_header = Swig_filebyname("header");
-      /* 
-	 in C++ mode we can't emit a extern declaration derived from
-	 the definition, for example, if we have
 
-	   --- foo.c ---
-	   int foo(int bar) {
-	   }
-	   --- foo.c ---
+      if (AddExtern) {
+	if (f_header) {
+	  if ((Cmp(storage,"extern") == 0) || (ForceExtern && !storage)) {
+	    /* we don't need the 'extern' part in the C/C++ declaration,
+	       and it produces some problems when namespace and SUN
+	       Studio is used.
 
-	 we could be tempted to declare
-
-	   extern int foo(int bar);
-
-	 but the real declaration could be:
-	 
-	   extern int foo(int bar = 1);
-
-	 hence, the user MUST provide the declaration, and swig
-	 shouldn't attempt to deduce it.
-      */
-      if (f_header) {
-	int extern_c = Cmp(storage,"externc") == 0;
-	int need_extern = CPlusPlus ? extern_c : 1;
-	if (!NoExtern && need_extern) {
-	  if ((storage && Strstr(storage,"extern")) || (ForceExtern && !storage)) {
+	       Printf(f_header,"extern %s", SwigType_str(ty,name));
+	       
+	       In fact generating extern declarations is quite error prone and is
+	       no longer the default. Getting it right seems impossible with namespaces
+	       and default arguments and when a method is declared with the various Windows
+	       calling conventions - SWIG doesn't understand Windows (non standard) calling
+	       conventions in the first place, so can't regenerate them.
+	    */
 	    String *str = SwigType_str(ty,name);
-	    Printf(f_header,"extern ", str);
-	    if (extern_c) {
-	      /* here 'extern "C"' is needed */
-	      Printf(f_header, "\"C\" ");
-	    }
 	    Printf(f_header,"%s", str);
 	    Delete(str);
+	    {
+	      DOH *t = Getattr(n,"throws");
+	      if (t) {
+		Printf(f_header," throw(");
+		while (t) {
+		  Printf(f_header,"%s", Getattr(t,"type"));
+		  t = nextSibling(t);
+		  if (t) Printf(f_header,",");
+		}
+		Printf(f_header,")");
+	      }
+	    }
 	    Printf(f_header,";\n");
+	  } else if (Cmp(storage,"externc") == 0) {
+	    /* here 'extern "C"' is needed */
+	    String *str = SwigType_str(ty,name);
+	    Printf(f_header, "extern \"C\" %s;\n", str);
+	    Delete(str);
 	  }
 	}
       }
@@ -858,7 +861,7 @@ int Language::cDeclaration(Node *n) {
     if (!CurrentClass) {
       if ((Cmp(storage,"extern") == 0) || ForceExtern) {
 	f_header = Swig_filebyname("header");
-	if (!NoExtern) {
+	if (AddExtern) {
 	  if (f_header) {
 	    String *str = SwigType_str(ty,name);
 	    Printf(f_header,"extern %s;\n", str);

Source/Modules/main.cxx

@@ -35,7 +35,7 @@ char cvsroot_main_cxx[] = "$Header$";
     int        GenerateDefault = 1;             // Generate default constructors
     char      *Config = 0;
     int        Verbose = 0;
-    int        NoExtern = 0;
+    int        AddExtern = 0;
     int        NoExcept = 0;
     char      *SwigLib;
     int        SwigRuntime = 0;                 // 0 = no option, 1 = -c or -runtime, 2 = -noruntime
@@ -82,7 +82,7 @@ static const char *usage2 = (const char*)"\
      -nodefault      - Do not generate constructors/destructors\n\
      -nodirprot      - Do not wrap director protected members\n\
      -noexcept       - Do not wrap exception specifiers\n\
-     -noextern       - Do not generate extern declarations\n\
+     -addextern      - Add extra extern declarations\n\
      -nopreprocess   - Skip the preprocessor step\n\
      -notemplatereduce - Disable reduction of the typedefs in templates \n\
      -o <outfile>    - Set name of the output file to <outfile>\n\
@@ -421,7 +421,11 @@ void SWIG_getoptions(int argc, char *argv[])
 	    NoExcept = 1;
 	    Swig_mark_arg(i);
 	  } else if (strcmp(argv[i],"-noextern") == 0) {
-	    NoExtern = 1;
+	    Swig_warning(WARN_DEPRECATED_NOEXTERN, "SWIG",1, "-noextern command line option is deprecated; extern is no longer generated by default.\n");
+	    AddExtern = 0;
+	    Swig_mark_arg(i);
+	  } else if (strcmp(argv[i],"-addextern") == 0) {
+	    AddExtern = 1;
 	    Swig_mark_arg(i);
 	  } else if (strcmp(argv[i],"-show_templates") == 0) {
 	    Swig_cparse_debug_templates(1);