6 files changed, 13 insertions, 10 deletions
diff --git a/Eigen/src/Core/products/GeneralMatrixMatrix.h b/Eigen/src/Core/products/GeneralMatrixMatrix.h
index 3286379e8..07721145a 100644
--- a/Eigen/src/Core/products/GeneralMatrixMatrix.h
+++ b/Eigen/src/Core/products/GeneralMatrixMatrix.h
@@ -160,7 +160,8 @@ static void run(Index rows, Index cols, Index depth,
   else
 #endif // EIGEN_HAS_OPENMP
   {
-    (void)info; // info is not used
+    EIGEN_UNUSED_VARIABLE(info);
+
     // this is the sequential version!
     Scalar* blockA = ei_aligned_stack_new(Scalar, kc*mc);
     std::size_t sizeB = kc*Blocking::PacketSize*Blocking::nr + kc*cols;
diff --git a/Eigen/src/Core/util/Macros.h b/Eigen/src/Core/util/Macros.h
index 82045b37c..061767039 100644
--- a/Eigen/src/Core/util/Macros.h
+++ b/Eigen/src/Core/util/Macros.h
@@ -176,6 +176,9 @@
 #define EIGEN_UNUSED
 #endif
 
+// Suppresses 'unused variable' warnings.
+#define EIGEN_UNUSED_VARIABLE(var) (void)var;
+
 #if (defined __GNUC__)
 #define EIGEN_ASM_COMMENT(X)  asm("#"X)
 #else
diff --git a/Eigen/src/Core/util/Memory.h b/Eigen/src/Core/util/Memory.h
index 6b202dbc8..c67b9774f 100644
--- a/Eigen/src/Core/util/Memory.h
+++ b/Eigen/src/Core/util/Memory.h
@@ -218,7 +218,7 @@ inline void ei_aligned_free(void *ptr)
 **/
 inline void* ei_aligned_realloc(void *ptr, size_t new_size, size_t old_size)
 {
-  (void)old_size; // Suppress 'unused variable' warning. Seen in boost tee.
+  EIGEN_UNUSED_VARIABLE(old_size);
 
   void *result;
 #if !EIGEN_ALIGN
diff --git a/Eigen/src/Sparse/SparseProduct.h b/Eigen/src/Sparse/SparseProduct.h
index 2f86b2b2d..7a91c9cf0 100644
--- a/Eigen/src/Sparse/SparseProduct.h
+++ b/Eigen/src/Sparse/SparseProduct.h
@@ -382,9 +382,9 @@ struct ei_sparse_product_selector2<Lhs,Rhs,ResultType,RowMajor,ColMajor,ColMajor
   static void run(const Lhs& lhs, const Rhs& rhs, ResultType& res)
   {
       // prevent warnings until the code is fixed
-      (void) lhs;
-      (void) rhs;
-      (void) res;
+      EIGEN_UNUSED_VARIABLE(lhs);
+      EIGEN_UNUSED_VARIABLE(rhs);
+      EIGEN_UNUSED_VARIABLE(res);
 
 //     typedef SparseMatrix<typename ResultType::Scalar,RowMajor> RowMajorMatrix;
 //     RowMajorMatrix rhsRow = rhs;
diff --git a/test/first_aligned.cpp b/test/first_aligned.cpp
index 5fb806298..687f4a5dc 100644
--- a/test/first_aligned.cpp
+++ b/test/first_aligned.cpp
@@ -34,9 +34,8 @@ void test_first_aligned_helper(Scalar *array, int size)
 template<typename Scalar>
 void test_none_aligned_helper(Scalar *array, int size)
 {
-  // Suppress 'unreferenced formal parameter's warnings.
-  (void)array;
-  (void)size;
+  EIGEN_UNUSED_VARIABLE(array);
+  EIGEN_UNUSED_VARIABLE(size);
   VERIFY(ei_packet_traits<Scalar>::size == 1 || ei_first_aligned(array, size) == size);
 }
 
diff --git a/test/triangular.cpp b/test/triangular.cpp
index d6d64e595..12452515e 100644
--- a/test/triangular.cpp
+++ b/test/triangular.cpp
@@ -235,8 +235,8 @@ void test_triangular()
 {
   for(int i = 0; i < g_repeat ; i++)
   {
-    EIGEN_UNUSED int r = ei_random<int>(2,20);
-    EIGEN_UNUSED int c = ei_random<int>(2,20);
+    int r = ei_random<int>(2,20); EIGEN_UNUSED_VARIABLE(r);
+    int c = ei_random<int>(2,20); EIGEN_UNUSED_VARIABLE(c);
 
     CALL_SUBTEST_1( triangular_square(Matrix<float, 1, 1>()) );
     CALL_SUBTEST_2( triangular_square(Matrix<float, 2, 2>()) );