GCC 4.4 compatibility: copy constructor ambiguity in matrix/vector classes.

Our own "copy" constructor accepting base class conflicts with the
default one, which for some reason gets added too. Newer versions don't
have this issue.

src/Math/Test/MatrixTest.cpp

@@ -108,10 +108,18 @@ MatrixTest::MatrixTest() {
 }
 
 void MatrixTest::construct() {
+    #ifndef CORRADE_GCC44_COMPATIBILITY
     constexpr Matrix4 a = {Vector4(3.0f,  5.0f, 8.0f, -3.0f),
                            Vector4(4.5f,  4.0f, 7.0f,  2.0f),
                            Vector4(1.0f,  2.0f, 3.0f, -1.0f),
                            Vector4(7.9f, -1.0f, 8.0f, -1.5f)};
+    #else
+    /* Ambiguity with default copy constructor */
+    constexpr Matrix4 a(Vector4(3.0f,  5.0f, 8.0f, -3.0f),
+                        Vector4(4.5f,  4.0f, 7.0f,  2.0f),
+                        Vector4(1.0f,  2.0f, 3.0f, -1.0f),
+                        Vector4(7.9f, -1.0f, 8.0f, -1.5f));
+    #endif
     CORRADE_COMPARE(a, Matrix4(Vector4(3.0f,  5.0f, 8.0f, -3.0f),
                                Vector4(4.5f,  4.0f, 7.0f,  2.0f),
                                Vector4(1.0f,  2.0f, 3.0f, -1.0f),

src/Math/Test/Vector2Test.cpp

@@ -96,7 +96,11 @@ Vector2Test::Vector2Test() {
 }
 
 void Vector2Test::construct() {
+    #ifndef CORRADE_GCC44_COMPATIBILITY
     constexpr Vector2 a = {1.5f, 2.5f};
+    #else
+    constexpr Vector2 a(1.5f, 2.5f); /* Ambiguity with default copy constructor */
+    #endif
     CORRADE_COMPARE(a, (Vector<2, Float>(1.5f, 2.5f)));
 }
 

src/Math/Test/Vector3Test.cpp

@@ -98,7 +98,11 @@ Vector3Test::Vector3Test() {
 }
 
 void Vector3Test::construct() {
+    #ifndef CORRADE_GCC44_COMPATIBILITY
     constexpr Vector3 a = {1.0f, 2.5f, -3.0f};
+    #else
+    constexpr Vector3 a(1.0f, 2.5f, -3.0f); /* Ambiguity with default copy constructor */
+    #endif
     CORRADE_COMPARE(a, (Vector<3, Float>(1.0f, 2.5f, -3.0f)));
 }
 

src/Math/Test/Vector4Test.cpp

@@ -95,7 +95,11 @@ Vector4Test::Vector4Test() {
 }
 
 void Vector4Test::construct() {
+    #ifndef CORRADE_GCC44_COMPATIBILITY
     constexpr Vector4 a = {1.0f, -2.5f, 3.0f, 4.1f};
+    #else
+    constexpr Vector4 a(1.0f, -2.5f, 3.0f, 4.1f); /* Ambiguity with default copy constructor */
+    #endif
     CORRADE_COMPARE(a, (Vector<4, Float>(1.0f, -2.5f, 3.0f, 4.1f)));
 }
 

src/Test/ArrayTest.cpp

@@ -61,13 +61,21 @@ void ArrayTest::construct() {
     constexpr Array1D b = 5;
     CORRADE_COMPARE(b, (Array<1, Int>(5)));
 
+    #ifndef CORRADE_GCC44_COMPATIBILITY
     constexpr Array2D c = {5, 3};
+    #else
+    constexpr Array2D c(5, 3); /* Ambiguity with default copy constructor */
+    #endif
     CORRADE_COMPARE(c, (Array<2, Int>(5, 3)));
 
     constexpr Array2D c2 = 5;
     CORRADE_COMPARE(c2, (Array<2, Int>(5, 5)));
 
+    #ifndef CORRADE_GCC44_COMPATIBILITY
     constexpr Array3D d = {5, 3, -2};
+    #else
+    constexpr Array3D d(5, 3, -2); /* Ambiguity with default copy constructor */
+    #endif
     CORRADE_COMPARE(d, (Array<3, Int>(5, 3, -2)));
 
     constexpr Array3D d2 = 5;