Engine won't compile with Steamworks 1.32 (latest)

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1

A new Steamworks SDK was released a few days ago, version 1.32 and after spending time trying to figure out why it wouldn’t compile. I determined that Steamworks now clobbers the ARRAY_COUNT macro from the UE.

// Unreal
#define ARRAY_COUNT( array ) (sizeof(ArrayCountHelper(array))+0)

// Steamworks 1.32
#define ARRAY_COUNT(COUNTER) CLANG_ATTR( "array_count:" #COUNTER ";" )

It can be easily worked around by not using the MACRO in the particular parts of the code that get broken., but is there something else that should really be done?

2

Hey Byte1-

Thanks for lettings us know about this problem. I have submitted this bug (UE-9453) to our internal database for further investigation.

Cheers

3

We’ll have to try an official integration with the new SDK to see how we can work around this. I’ve asked for a ticket to be filed to get this underway.

That being said, have you tried any bit of #undef ARRAY_COUNT to see if it can be circumvented? You could try in the Steam PCH that we have, right after we include steam_api.h?

4

I tried that a little bit ago and it was unsuccessful. It causes compilation errors in various engine files

5

Which engine files? The idea would be to add back the engine version of ARRAY_COUNT after the #undef. I’m assuming adding an include in our steam cpps. I don’t expect that we need their Steam version ever.

6

I just redid a new project to work on learning a bit about plugins, etc… so let me re-add the Steam SDK and I’ll post a followup!

7

I was able to fix this after more investigation. The undef/define did work, but I was missing the fact that SteamVR was also pulling the steam headers.

I submitted a pull request to make needed changes to the PCH headers for 4.7

edit: https://github.com/EpicGames/UnrealEngine/pull/819 (forgot to branch and had made some version changes that weren’t intended)

8

I fix SteamVRPrivatePCH.h and OnlineSubsystemSteamPrivatePCH.h, and recompie agan, still got error:
D:\Unreal Engine\UnrealEngine-4.7\Engine\Source\Runtime\Online\OnlineSubsystemSteam\Private\IPAddressSteam.cpp(21): error C2065: “array”: 未声明的标识符
1>D:\Unreal Engine\UnrealEngine-4.7\Engine\Source\Runtime\Online\OnlineSubsystemSteam\Private\OnlineIdentityInterfaceSteam.cpp(185): error C2065: “array”: 未声明的标识符
1>D:\Unreal Engine\UnrealEngine-4.7\Engine\Source\Runtime\Online\OnlineSubsystemSteam\Private\OnlineSessionAsyncServerSteam.cpp(949): error C2065: “array”: 未声明的标识符

9

Is their an official fix for this? It is biting us on an OS X Build currently.

10

The official fix is already checked in, and should be in 4.13, but I’ll post it here.

In OnlineSubsystemSteam\Source\Private\OnlineSubsystemSteamPrivatePCH.h

#pragma push_macro("ARRAY_COUNT")
#undef ARRAY_COUNT

#include "steam/steam_api.h"
#include "steam/steam_gameserver.h"

#pragma pop_macro("ARRAY_COUNT")

and
In \SteamController\Source\SteamController\Private\SteamControllerPrivatePCH.h

#pragma push_macro("ARRAY_COUNT")
#undef ARRAY_COUNT

#include <steam/steam_api.h>

#pragma pop_macro("ARRAY_COUNT")