Silent clang -Wconversion warnings

Cython/Utility/ModuleSetupCode.c

@@ -464,7 +464,7 @@ static void __pyx_insert_code_object(int code_line, PyCodeObject* code_object) {
     if (__pyx_code_cache.count == __pyx_code_cache.max_count) {
         int new_max = __pyx_code_cache.max_count + 64;
         entries = (__Pyx_CodeObjectCacheEntry*)PyMem_Realloc(
-            __pyx_code_cache.entries, new_max*sizeof(__Pyx_CodeObjectCacheEntry));
+            __pyx_code_cache.entries, (size_t)new_max*sizeof(__Pyx_CodeObjectCacheEntry));
         if (unlikely(!entries)) {
             return;
         }

Cython/Utility/Optimize.c

@@ -140,7 +140,7 @@ static PyObject* __Pyx_PyList_PopIndex(PyObject* L, Py_ssize_t ix) {
             PyObject* v = PyList_GET_ITEM(L, cix);
             Py_SIZE(L) -= 1;
             size -= 1;
-            memmove(&PyList_GET_ITEM(L, cix), &PyList_GET_ITEM(L, cix+1), (size-cix)*sizeof(PyObject*));
+            memmove(&PyList_GET_ITEM(L, cix), &PyList_GET_ITEM(L, cix+1), (size_t)(size-cix)*sizeof(PyObject*));
             return v;
         }
     }

Cython/Utility/StringTools.c

@@ -190,7 +190,7 @@ static CYTHON_INLINE int __Pyx_PyUnicode_Equals(PyObject* s1, PyObject* s2, int
         } else if (length == 1) {
             goto return_eq;
         } else {
-            int result = memcmp(data1, data2, length * kind);
+            int result = memcmp(data1, data2, (size_t)(length * kind));
             #if PY_MAJOR_VERSION < 3
             Py_XDECREF(owned_ref);
             #endif
@@ -612,7 +612,7 @@ static int __Pyx_PyBytes_SingleTailmatch(PyObject* self, PyObject* arg, Py_ssize
     }
 
     if (start + sub_len <= end)
-        retval = !memcmp(self_ptr+start, sub_ptr, sub_len);
+        retval = !memcmp(self_ptr+start, sub_ptr, (size_t)sub_len);
     else
         retval = 0;
 

Cython/Utility/TypeConversion.c

@@ -43,7 +43,7 @@ static CYTHON_INLINE size_t __Pyx_Py_UNICODE_strlen(const Py_UNICODE *u)
 {
     const Py_UNICODE *u_end = u;
     while (*u_end++) ;
-    return u_end - u - 1;
+    return (size_t)(u_end - u - 1);
 }
 #else
 #define __Pyx_Py_UNICODE_strlen Py_UNICODE_strlen
@@ -151,7 +151,7 @@ bad:
 /* Type Conversion Functions */
 
 static CYTHON_INLINE PyObject* __Pyx_PyUnicode_FromString(const char* c_str) {
-    return __Pyx_PyUnicode_FromStringAndSize(c_str, strlen(c_str));
+    return __Pyx_PyUnicode_FromStringAndSize(c_str, (Py_ssize_t)strlen(c_str));
 }
 
 static CYTHON_INLINE char* __Pyx_PyObject_AsString(PyObject* o) {