在 Linux / GCC 中编译期间 Steam 回调触发警告答案

【问题标题】：Steam Callbacks Trigger Warning During Compile In Linux / GCC在 Linux / GCC 中编译期间 Steam 回调触发警告
【发布时间】：2020-04-24 09:25:08
【问题描述】：

我从事 Steamworks 集成工作已有一段时间了，每次在 Linux 上编译时，我的所有回调都会触发此警告。每个人一个，所以有一堵墙。话虽如此，回调工作得很好。

module.h: In member function 'virtual void Steam::CCallbackInternal__steam_api_call_completed::Run(void*)':
module.h:667:18: warning: offsetof within non-standard-layout type 'Steam' is conditionally-supported [-Winvalid-offsetof]
  667 |   STEAM_CALLBACK(Steam, _steam_api_call_completed, SteamAPICallCompleted_t);
sdk/public/steam/steam_api_internal.h:39:58: note: in expansion of macro '_STEAM_CALLBACK_3'
   39 | #define _STEAM_CALLBACK_HELPER( _1, _2, SELECTED, ... )  _STEAM_CALLBACK_##SELECTED
      |                                                          ^~~~~~~~~~~~~~~~
sdk/public/steam/steam_api_common.h:99:2: note: in expansion of macro '_STEAM_CALLBACK_SELECT'
   99 |  _STEAM_CALLBACK_SELECT( ( __VA_ARGS__, 4, 3 ), ( /**/, thisclass, func, __VA_ARGS__ ) )
      |  ^~~~~~~~~~~~~~~~~~~~~~
module.h:667:3: note: in expansion of macro 'STEAM_CALLBACK'
  667 |   STEAM_CALLBACK(Steam, _steam_api_call_completed, SteamAPICallCompleted_t);
      |   ^~~~~~~~~~~~~~
module.h: In member function 'virtual void Steam::CCallbackInternal__steam_shutdown::Run(void*)':
module.h:668:18: warning: offsetof within non-standard-layout type 'Steam' is conditionally-supported [-Winvalid-offsetof]
  668 |   STEAM_CALLBACK(Steam, _steam_shutdown, SteamShutdown_t);
sdk/public/steam/steam_api_internal.h:39:58: note: in expansion of macro '_STEAM_CALLBACK_3'
   39 | #define _STEAM_CALLBACK_HELPER( _1, _2, SELECTED, ... )  _STEAM_CALLBACK_##SELECTED
      |                                                          ^~~~~~~~~~~~~~~~
sdk/public/steam/steam_api_common.h:99:2: note: in expansion of macro '_STEAM_CALLBACK_SELECT'
   99 |  _STEAM_CALLBACK_SELECT( ( __VA_ARGS__, 4, 3 ), ( /**/, thisclass, func, __VA_ARGS__ ) )
      |  ^~~~~~~~~~~~~~~~~~~~~~
module.h:668:3: note: in expansion of macro 'STEAM_CALLBACK'
  668 |   STEAM_CALLBACK(Steam, _steam_shutdown, SteamShutdown_t);

当回调起作用时，想知道是什么导致了这些警告以及如何解决它们。

我正在使用 GCC / G++ 9.2.1 在 Ubuntu Linux 19.10 中编译，供参考。

【问题讨论】：

标签： c++ linux ubuntu steam steamworks-api

【解决方案1】：

我不得不让他们沉默

#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Winvalid-offsetof"

// my code

#pragma GCC diagnostic pop

【讨论】：