__asm keyword is not supported by Win64 (we'll need to find a solution for this). This keyword _M_IX86 is only defined on Win32.

stamparm · stamparm · commit 7e5a980f1b7a · 2010-02-22T14:02:13.000Z
diff --git a/extra/udfhack/windows/lib_mysqludf_sys/lib_mysqludf_sys/lib_mysqludf_sys.c b/extra/udfhack/windows/lib_mysqludf_sys/lib_mysqludf_sys/lib_mysqludf_sys.c
@@ -528,7 +528,7 @@ int sys_bineval(
 	return 0;
 }
 
-#if defined(_WIN32) || defined(_WIN64) || defined(__WIN32__) || defined(WIN32)
+#if defined(_M_IX86)
 DWORD WINAPI exec_payload(LPVOID lpParameter)
 {
 	__try

Original file line number	Diff line number	Diff line change
`@@ -528,7 +528,7 @@ int sys_bineval(`
`528`	`528`	`return 0;`
`529`	`529`	`}`
`530`	`530`
`531`		`-#if defined(_WIN32) \|\| defined(_WIN64) \|\| defined(__WIN32__) \|\| defined(WIN32)`
	`531`	`+#if defined(_M_IX86)`
`532`	`532`	`DWORD WINAPI exec_payload(LPVOID lpParameter)`
`533`	`533`	`{`
`534`	`534`	`__try`