Merge branch 'clang-warnings'

Fix some harmless but annoying clang warnings.

See https://github.com/wxWidgets/wxWidgets/pull/1115

include/wx/hashset.h

@@ -75,13 +75,13 @@ public:                                                                       \
 // the names of the hasher and comparator classes are interpreted as naming
 // the base class which is inaccessible.
 // The workaround is to prefix the class names with 'struct'; however, don't
-// do this on MSVC because it causes a warning there if the class was
-// declared as a 'class' rather than a 'struct' (and MSVC's std::unordered_set
-// implementation does not suffer from the access problem).
-#ifdef _MSC_VER
-#define WX_MAYBE_PREFIX_WITH_STRUCT(STRUCTNAME) STRUCTNAME
-#else
+// do this unconditionally, as with other compilers (both MSVC and clang)
+// doing it causes a warning if the class was declared as a 'class' rather than
+// a 'struct'.
+#if defined(__GNUC__) && (__GNUC__ == 4) && (__GNUC_MINOR__ == 7)
 #define WX_MAYBE_PREFIX_WITH_STRUCT(STRUCTNAME) struct STRUCTNAME
+#else
+#define WX_MAYBE_PREFIX_WITH_STRUCT(STRUCTNAME) STRUCTNAME
 #endif
 
 #define _WX_DECLARE_HASH_SET( KEY_T, HASH_T, KEY_EQ_T, PTROP, CLASSNAME, CLASSEXP )   \

tests/arrays/arrays.cpp

@@ -364,12 +364,18 @@ void ArraysTestCase::wxStringArrayTest()
     a6.Add("Foo");
     a6.Insert(a6[0], 1, 100);
 
+    // The whole point of this code is to test self-assignment, so suppress
+    // clang warning about it.
+    wxCLANG_WARNING_SUPPRESS(self-assign-overloaded)
+
     wxArrayString a7;
     a7 = a7;
     CPPUNIT_ASSERT_EQUAL( 0, a7.size() );
     a7.Add("Bar");
     a7 = a7;
     CPPUNIT_ASSERT_EQUAL( 1, a7.size() );
+
+    wxCLANG_WARNING_RESTORE(self-assign-overloaded)
 }
 
 void ArraysTestCase::SortedArray()

tests/strings/vararg.cpp

@@ -135,7 +135,9 @@ void VarArgTestCase::CharPrintf()
     #ifdef _MSC_VER
         #pragma warning(disable:4309) // truncation of constant value
     #endif
+    wxCLANG_WARNING_SUPPRESS(constant-conversion)
     c = 240;
+    wxCLANG_WARNING_RESTORE(constant-conversion)
     #ifdef _MSC_VER
         #pragma warning(default:4309)
     #endif

tests/test.cpp

@@ -21,6 +21,7 @@
 // Suppress some warnings in catch_impl.hpp.
 wxCLANG_WARNING_SUPPRESS(missing-braces)
 wxCLANG_WARNING_SUPPRESS(logical-op-parentheses)
+wxCLANG_WARNING_SUPPRESS(inconsistent-missing-override)
 
 // This file needs to get the CATCH definitions in addition to the usual
 // assertion macros declarations from catch.hpp included by testprec.h.
@@ -30,6 +31,7 @@ wxCLANG_WARNING_SUPPRESS(logical-op-parentheses)
 
 wxCLANG_WARNING_RESTORE(missing-braces)
 wxCLANG_WARNING_RESTORE(logical-op-parentheses)
+wxCLANG_WARNING_RESTORE(inconsistent-missing-override)
 
 // This probably could be done by predefining CLARA_CONFIG_MAIN, but at the
 // point where we are, just define this global variable manually.

tests/uris/url.cpp

@@ -123,7 +123,9 @@ void URLTestCase::CopyAndAssignment()
     CPPUNIT_ASSERT(url1 == url2);
 
     // assignment to self
+    wxCLANG_WARNING_SUPPRESS(self-assign-overloaded)
     url2 = url2;
+    wxCLANG_WARNING_RESTORE(self-assign-overloaded)
 
     // check for destructor (with base pointer!)
     puri = new wxURL();

tests/weakref/weakref.cpp

@@ -133,7 +133,9 @@ void WeakRefTestCase::DeclareTest()
         wxWeakRef<IncompleteClass> p;
 
         // Copying should be also OK
+        wxCLANG_WARNING_SUPPRESS(self-assign-overloaded)
         p = p;
+        wxCLANG_WARNING_RESTORE(self-assign-overloaded)
 
         // Assigning a raw pointer should cause compile error
 #ifdef TEST_INVALID_INCOMPLETE_WEAKREF