Fix GCC -Wpedantic and -Wunused-but-set-variable warnings (#347)

Author: Kiptoo-Deus

Inc/DirectXMath.h

@@ -617,6 +617,15 @@ namespace DirectX
     // Fix-up for (2nd+) XMMATRIX parameters to pass by reference
     typedef const XMMATRIX& CXMMATRIX;
 
+#ifdef __clang__
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wgnu-anonymous-struct"
+#pragma clang diagnostic ignored "-Wnested-anon-types"
+#elif defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic"
+#endif
+
 #ifdef _XM_NO_INTRINSICS_
     struct XMMATRIX
 #else
@@ -713,6 +722,12 @@ namespace DirectX
         friend XMMATRIX XM_CALLCONV operator*(float S, FXMMATRIX M) noexcept;
     };
 
+#ifdef __clang__
+#pragma clang diagnostic pop
+#elif defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+
     //------------------------------------------------------------------------------
     // 2D Vector; 32 bit floating point components
     struct XMFLOAT2
@@ -1031,6 +1046,9 @@ namespace DirectX
 #pragma clang diagnostic ignored "-Wnested-anon-types"
 #pragma clang diagnostic ignored "-Wunknown-warning-option"
 #pragma clang diagnostic ignored "-Wunsafe-buffer-usage"
+#elif defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic"
 #endif
 
     //------------------------------------------------------------------------------
@@ -1412,6 +1430,8 @@ namespace DirectX
 
 #ifdef __clang__
 #pragma clang diagnostic pop
+#elif defined(__GNUC__)
+#pragma GCC diagnostic pop
 #endif
 #ifdef _PREFAST_
 #pragma prefast(pop)

Inc/DirectXMathMatrix.inl

@@ -1137,6 +1137,8 @@ _Use_decl_annotations_ inline bool
         fAbsZ = fabsf(XMVectorGetZ(ppvBasis[a][0]));
 
         XM3RANKDECOMPOSE(aa, bb, cc, fAbsX, fAbsY, fAbsZ)
+        (void)aa;
+        (void)bb;
 
         ppvBasis[b][0] = XMVector3Cross(ppvBasis[a][0], pvCanonicalBasis[cc][0]);
     }

Inc/DirectXPackedVector.h

@@ -29,6 +29,9 @@ namespace DirectX
 #pragma clang diagnostic push
 #pragma clang diagnostic ignored "-Wgnu-anonymous-struct"
 #pragma clang diagnostic ignored "-Wnested-anon-types"
+#elif defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic"
 #endif
 
         //------------------------------------------------------------------------------
@@ -1400,6 +1403,8 @@ namespace DirectX
 
 #ifdef __clang__
 #pragma clang diagnostic pop
+#elif defined(__GNUC__)
+#pragma GCC diagnostic pop
 #endif
 #ifdef _MSC_VER
 #pragma warning(pop)