Merge pull request #12673 from alalek:fix_build_warnings

* fix build warnings

* python: forbid wrapping of functions with "void*" arguments

modules/core/include/opencv2/core/cuda.hpp

@@ -134,8 +134,8 @@ public:
     CV_WRAP GpuMat(const GpuMat& m);
 
     //! constructor for GpuMat headers pointing to user-allocated data
-    CV_WRAP GpuMat(int rows, int cols, int type, void* data, size_t step = Mat::AUTO_STEP);
-    CV_WRAP GpuMat(Size size, int type, void* data, size_t step = Mat::AUTO_STEP);
+    GpuMat(int rows, int cols, int type, void* data, size_t step = Mat::AUTO_STEP);
+    GpuMat(Size size, int type, void* data, size_t step = Mat::AUTO_STEP);
 
     //! creates a GpuMat header for a part of the bigger matrix
     CV_WRAP GpuMat(const GpuMat& m, Range rowRange, Range colRange);

modules/python/src2/cv2.cpp

@@ -92,7 +92,7 @@ bool pyopencv_to(PyObject* dst, TYPE& src, const char* name)
 {                                                                                                     \
     if (!dst || dst == Py_None)                                                                       \
         return true;                                                                                  \
-    std::underlying_type<TYPE>::type underlying;                                                      \
+    std::underlying_type<TYPE>::type underlying = 0;                                                  \
                                                                                                       \
     if (!pyopencv_to(dst, underlying, name)) return false;                                            \
     src = static_cast<TYPE>(underlying);                                                              \

modules/python/src2/gen2.py

@@ -10,6 +10,8 @@ if sys.version_info[0] >= 3:
 else:
     from cStringIO import StringIO
 
+forbidden_arg_types = ["void*"]
+
 ignored_arg_types = ["RNG*"]
 
 pass_by_val_types = ["Point*", "Point2f*", "Rect*", "String*", "double*", "float*", "int*"]
@@ -483,6 +485,7 @@ class FuncVariant(object):
             argno += 1
             if a.name in self.array_counters:
                 continue
+            assert not a.tp in forbidden_arg_types, 'Forbidden type "{}" for argument "{}" in "{}" ("{}")'.format(a.tp, a.name, self.name, self.classname)
             if a.tp in ignored_arg_types:
                 continue
             if a.returnarg:
@@ -671,7 +674,7 @@ class FuncInfo(object):
                 if a.tp in ignored_arg_types:
                     defval = a.defval
                     if not defval and a.tp.endswith("*"):
-                        defval = 0
+                        defval = "0"
                     assert defval
                     if not code_args.endswith("("):
                         code_args += ", "