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-rw-r--r--odb/details/unused.hxx10
1 files changed, 9 insertions, 1 deletions
diff --git a/odb/details/unused.hxx b/odb/details/unused.hxx
index bf1638f..31ceb52 100644
--- a/odb/details/unused.hxx
+++ b/odb/details/unused.hxx
@@ -8,7 +8,15 @@
#include <odb/pre.hxx>
-#define ODB_POTENTIALLY_UNUSED(x) (void*)&x
+// VC++ doesn't like the (void)x expression if x is a reference to
+// an incomplete type. On the other hand, GCC warns that (void*)&x
+// doesn't have any effect.
+//
+#ifdef _MSC_VER
+# define ODB_POTENTIALLY_UNUSED(x) (void*)&x
+#else
+# define ODB_POTENTIALLY_UNUSED(x) (void)x
+#endif
#include <odb/post.hxx>