extern int (*mallctlnametomib)(const char*, size_t*, size_t*);
extern int (*mallctlbymib)(const size_t*, size_t, void*, size_t*, void*,
size_t);
+#ifdef _MSC_VER
+// We emulate weak linkage for MSVC. The symbols we're
+// aliasing to are hiding in MallocImpl.cpp
+#pragma comment(linker, "/alternatename:mallocx=mallocxWeak")
+#pragma comment(linker, "/alternatename:rallocx=rallocxWeak")
+#pragma comment(linker, "/alternatename:xallocx=xallocxWeak")
+#pragma comment(linker, "/alternatename:sallocx=sallocxWeak")
+#pragma comment(linker, "/alternatename:dallocx=dallocxWeak")
+#pragma comment(linker, "/alternatename:sdallocx=sdallocxWeak")
+#pragma comment(linker, "/alternatename:nallocx=nallocxWeak")
+#pragma comment(linker, "/alternatename:mallctl=mallctlWeak")
+#pragma comment(linker, "/alternatename:mallctlnametomib=mallctlnametomibWeak")
+#pragma comment(linker, "/alternatename:mallctlbymib=mallctlbymibWeak")
+#endif
#endif
}