Fix regression wrapping default const bool argument

We need to strip qualifiers before checking the type is `bool`.

This mainly affects Python.  In Ruby there's equivalent code, but
it is only use to generate documentation comments.

Fixes #3052

Examples/test-suite/default_arg_values.i

@@ -1,11 +1,19 @@
 %module default_arg_values
 
-%{
+%inline %{
+
+#ifdef SWIG
+// Some compilers warn about 'float v = NULL', so only SWIG sees this peculiarity
+// Bad Python wrappers were being generated when NULL used for primitive type
+# define NULL_FOR_FLOAT NULL
+#else
+# define NULL_FOR_FLOAT 0
+#endif
+
 struct Display {
-  // Some compilers warn about 'float v = NULL', so only SWIG sees this peculiarity
-  // Bad Python wrappers were being generated when NULL used for primitive type
-  float draw1(float v = 0) { return v; }
-  float draw2(float *v = 0) { return v ? *v : 0; }
+  float draw1(float v = NULL_FOR_FLOAT) { return v; }
+  float draw2(float *v = NULL_FOR_FLOAT) { return v ? *v : 0; }
+  int draw3(int index = 0, const bool interpolate = true) { return interpolate ? index : -index; }
   bool bool0(bool x = 0) { return x; }
   bool bool1(bool x = 1) { return x; }
 
@@ -14,17 +22,5 @@ struct Display {
   bool mybool1(mybool x = 1) { return x; }
 };
 float* createPtr(float v) { static float val; val = v; return &val; }
+
 %}
-
-struct Display {
-  // Bad Python wrappers were being generated when NULL used for primitive type
-  float draw1(float v = NULL) { return v; }
-  float draw2(float *v = NULL) { return v ? *v : 0; }
-  bool bool0(bool x = 0) { return x; }
-  bool bool1(bool x = 1) { return x; }
-
-  typedef bool mybool;
-  bool mybool0(mybool x = 0) { return x; }
-  bool mybool1(mybool x = 1) { return x; }
-};
-float* createPtr(float v) { static float val; val = v; return &val; }

Examples/test-suite/python/default_arg_values_runme.py

@@ -15,6 +15,9 @@ if d.draw2() != 0:
 if d.draw2(p) != 123:
     raise RuntimeError
 
+if d.draw3() != 0:
+    raise RuntimeError
+
 if d.bool0() != False or type(d.bool0()) != type(False):
     raise RuntimeError
 

Examples/test-suite/ruby/default_arg_values_runme.rb

@@ -0,0 +1,26 @@
+#!/usr/bin/env ruby
+
+require 'swig_assert'
+
+require 'default_arg_values'
+
+d = Default_arg_values::Display.new
+
+raise RuntimeError if d.draw1() != 0
+
+raise RuntimeError if d.draw1(12) != 12
+
+p = Default_arg_values::createPtr(123)
+raise RuntimeError if d.draw2() != 0
+
+raise RuntimeError if d.draw2(p) != 123
+
+raise RuntimeError if d.draw3() != 0
+
+raise RuntimeError unless d.bool0() === false
+
+raise RuntimeError unless d.bool1() === true
+
+raise RuntimeError unless d.mybool0() === false
+
+raise RuntimeError unless d.mybool1() === true

Source/Modules/python.cxx

@@ -2146,22 +2146,24 @@ public:
       // FIXME: This needs more careful testing.
       // return NewStringf("'%(escape)s'", stringval);
     }
+    SwigType *resolved_type = SwigType_typedef_resolve_all(type);
+    SwigType *unqualified_type = SwigType_strip_qualifiers(resolved_type);
     if (numval) {
-      SwigType *resolved_type = SwigType_typedef_resolve_all(type);
-      if (Equal(resolved_type, "bool")) {
+      if (Equal(unqualified_type, "bool")) {
 	Delete(resolved_type);
+	Delete(unqualified_type);
 	return NewString(*Char(numval) == '0' ? "False" : "True");
       }
-      String *result = convertIntegerValue(numval, resolved_type);
+      String *result = convertIntegerValue(numval, unqualified_type);
       Delete(resolved_type);
+      Delete(unqualified_type);
       return result;
     }
-    SwigType *resolved_type = SwigType_typedef_resolve_all(type);
 
     String *result = convertDoubleValue(v);
     if (!result) {
       if (Strcmp(v, "NULL") == 0 || Strcmp(v, "nullptr") == 0)
-	result = SwigType_ispointer(resolved_type) ? NewString("None") : NewString("0");
+	result = SwigType_ispointer(unqualified_type) ? NewString("None") : NewString("0");
       // This could also be an enum type, default value of which could be
       // representable in Python if it doesn't include any scope (which could,
       // but currently is not, translated).
@@ -2175,6 +2177,7 @@ public:
     }
 
     Delete(resolved_type);
+    Delete(unqualified_type);
     return result;
   }
 

Source/Modules/ruby.cxx

@@ -777,11 +777,14 @@ private:
     }
     if (numval) {
       SwigType *resolved_type = SwigType_typedef_resolve_all(type);
-      if (Equal(resolved_type, "bool")) {
+      SwigType *unqualified_type = SwigType_strip_qualifiers(resolved_type);
+      if (Equal(unqualified_type, "bool")) {
 	Delete(resolved_type);
+	Delete(unqualified_type);
 	return NewString(*Char(numval) == '0' ? "false" : "true");
       }
       Delete(resolved_type);
+      Delete(unqualified_type);
       if (SwigType_ispointer(type) && Equal(v, "0"))
 	return NewString("None");
       return Copy(v);