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Bug 3168

Summary: xinput build failure with dxsdk
Product: SDL Reporter: Ozkan Sezer <sezeroz>
Component: joystickAssignee: Ryan C. Gordon <icculus>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2 CC: amaranth72, philipp.wiesemann
Version: HG 2.0   
Hardware: All   
OS: Windows (All)   

Description Ozkan Sezer 2015-11-08 22:15:36 UTC 
Latest hg (rev. 9901 as of this writing) fails building whichever source
includes SDL_xinput.h against DXSDK June 2010 version.  The xinput.h in
the mentioned dxsdk does define struct _XINPUT_BATTERY_INFORMATION, but
it is guarded with #ifndef XINPUT_USE_9_1_0 and SDL sources and headers
do not define XINPUT_USE_9_1_0, so msvc fails when it finds the duplicated
typedef. This I experienced with MSVC-2005. Possibly the solution would
be defining XINPUT_USE_9_1_0 at top of SDL_xinput.h before xinput.h is
included.

In SDL_xinput.h, also had to replace _In_ with __in and _Out_ with __out
in XInputGetBatteryInformation_t definition, otherwise my MSVC-2005 had
some trouble. (This part might be something to do with my setup, not sure.)
Comment 1 Ozkan Sezer 2015-11-09 08:48:55 UTC 
OK, the following change fixes the build for me. Tested with VS2005, 2008 and 2013.

--- SDL2/src/core/windows/SDL_xinput.h~
+++ SDL2/src/core/windows/SDL_xinput.h
@@ -26,6 +26,7 @@
 #ifdef HAVE_XINPUT_H
 
 #include "SDL_windows.h"
+#define XINPUT_USE_9_1_0 /* dxsdk compatibility */
 #include <xinput.h>
 
 #ifndef XUSER_MAX_COUNT
@@ -146,9 +147,9 @@
 
 typedef DWORD (WINAPI *XInputGetBatteryInformation_t)
     (
-    _In_  DWORD                      dwUserIndex,
-    _In_  BYTE                       devType,
-    _Out_ XINPUT_BATTERY_INFORMATION *pBatteryInformation
+    __in  DWORD                      dwUserIndex,
+    __in  BYTE                       devType,
+    __out XINPUT_BATTERY_INFORMATION *pBatteryInformation
     );
 
 extern int WIN_LoadXInputDLL(void);


MinGW build is broken due to the same struct redifinition and also
because of the _In_/_Out_ or __in/__out stuff, but I don't have a
fix for it.
Comment 2 Ozkan Sezer 2015-11-09 10:15:11 UTC 
OK, the following version fixes MinGW case, too.

--- SDL2/src/core/windows/SDL_xinput.h~
+++ SDL2/src/core/windows/SDL_xinput.h
@@ -26,6 +26,7 @@
 #ifdef HAVE_XINPUT_H
 
 #include "SDL_windows.h"
+#define XINPUT_USE_9_1_0 /* dxsdk compatibility */
 #include <xinput.h>
 
 #ifndef XUSER_MAX_COUNT
@@ -118,11 +119,13 @@
     XINPUT_GAMEPAD_EX Gamepad;
 } XINPUT_STATE_EX;
 
+#ifndef __MINGW32__
 typedef struct _XINPUT_BATTERY_INFORMATION
 {
     BYTE BatteryType;
     BYTE BatteryLevel;
 } XINPUT_BATTERY_INFORMATION, *PXINPUT_BATTERY_INFORMATION;
+#endif
 
 /* Forward decl's for XInput API's we load dynamically and use if available */
 typedef DWORD (WINAPI *XInputGetState_t)
@@ -144,11 +147,19 @@
     XINPUT_CAPABILITIES* pCapabilities  /* [out] Receives the capabilities */
     );
 
+#ifndef _MSC_VER
+#ifndef __in
+#define __in
+#endif
+#ifndef __out
+#define __out
+#endif
+#endif
 typedef DWORD (WINAPI *XInputGetBatteryInformation_t)
     (
-    _In_  DWORD                      dwUserIndex,
-    _In_  BYTE                       devType,
-    _Out_ XINPUT_BATTERY_INFORMATION *pBatteryInformation
+    __in  DWORD                      dwUserIndex,
+    __in  BYTE                       devType,
+    __out XINPUT_BATTERY_INFORMATION *pBatteryInformation
     );
 
 extern int WIN_LoadXInputDLL(void);
Comment 3 Philipp Wiesemann 2015-11-15 18:26:35 UTC 
This building failure was maybe fixed here:
https://hg.libsdl.org/SDL/rev/31b7adf67756
Comment 4 Ozkan Sezer 2015-11-15 20:01:32 UTC 
Only the structure redefinition error is fixed, so not fully fixed:

1.  Older MinGW-w64 versions doesn't handle _In_/_Out_ and __in/__out 
 stuff, so they need defining.

2.  VS2005 still fails unless I replace those _In_/_Out_ with __in/__out.

So I suggest the following.

--- SDL2/src/core/windows/SDL_xinput.h~
+++ SDL2/src/core/windows/SDL_xinput.h
@@ -144,11 +144,19 @@
     XINPUT_CAPABILITIES* pCapabilities  /* [out] Receives the capabilities */
     );
 
+#ifndef _MSC_VER
+#ifndef __in
+#define __in
+#endif
+#ifndef __out
+#define __out
+#endif
+#endif /* ! _MSC_VER */
 typedef DWORD (WINAPI *XInputGetBatteryInformation_t)
     (
-    _In_  DWORD                         dwUserIndex,
-    _In_  BYTE                          devType,
-    _Out_ XINPUT_BATTERY_INFORMATION_EX *pBatteryInformation
+    __in  DWORD                         dwUserIndex,
+    __in  BYTE                          devType,
+    __out XINPUT_BATTERY_INFORMATION_EX *pBatteryInformation
     );
 
 extern int WIN_LoadXInputDLL(void);
Comment 5 Alex Szpakowski 2015-11-16 03:24:54 UTC 
Could the '_In_' and '_Out_' parts of the declaration simply be removed from SDL's code without issue, instead of making different compilers recognize them? From what I can tell (correct me if I'm wrong though), they're just macros that expand to nothing in normal circumstances.
Comment 6 Ozkan Sezer 2015-11-16 06:43:15 UTC 
Yes, the annotations can actually be removed.  They are used only by MSVC and aren't vital.
Comment 7 Sam Lantinga 2015-11-17 05:22:09 UTC 
Fixed, thanks!
https://hg.libsdl.org/SDL/rev/ac5490d5aefc