1 files changed, 15 insertions, 1 deletions
diff --git a/misc/cgo/testso/cgoso_c.c b/misc/cgo/testso/cgoso_c.c
index 8c15a6b9f..27155c27f 100644
--- a/misc/cgo/testso/cgoso_c.c
+++ b/misc/cgo/testso/cgoso_c.c
@@ -4,8 +4,22 @@
 
 // +build ignore
 
+#ifdef WIN32
+// A Windows DLL is unable to call an arbitrary function in
+// the main executable. Work around that by making the main
+// executable pass the callback function pointer to us.
+void (*goCallback)(void);
+__declspec(dllexport) void setCallback(void *f)
+{
+	goCallback = (void (*)())f;
+}
+__declspec(dllexport) void sofunc(void);
+#else
+extern void goCallback(void);
+void setCallback(void *f) { (void)f; }
+#endif
+
 void sofunc(void)
 {
-	extern void goCallback(void);
 	goCallback();
 }