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SDL and GLew conflict
k5748


Joined: 23 Apr 2014
Posts: 3
Post Posted: Thu Apr 24, 2014 1:57 am
Hi all. I'm developing a game for linux using SDL 1.2 (switching to 2.0 soon) and OpenGL (including glew and glm) in C++. On my 64 bit machine it compiles properly, but one of the testers (on 64bit) gets the following error:
Code:

In file included from /usr/include/SDL/SDL_main.h:26:0,
                 from /usr/include/SDL/SDL.h:30,
                 from main.cpp:11:
/usr/include/SDL/SDL_stdinc.h:106:9: error: reference to "int64_t" is ambiguous
 typedef int64_t  Sint64;
         ^
In file included from /usr/lib/gcc/x86_64-linux-gnu/4.8/include/stdint.h:9:0,
                 from /usr/include/GL/glew.h:224,
                 from main.cpp:4:
/usr/include/stdint.h:40:19: note: candidates are: typedef long int int64_t
 typedef long int  int64_t;
                   ^
In file included from /usr/include/glm/glm.hpp:88:0,
                 from main.cpp:8:
/usr/include/glm/fwd.hpp:305:24: note:                 typedef glm::detail::int64 glm::int64_t
  typedef detail::int64 int64_t;
                        ^
In file included from /usr/include/SDL/SDL_main.h:26:0,
                 from /usr/include/SDL/SDL.h:30,
                 from main.cpp:11:
/usr/include/SDL/SDL_stdinc.h:106:9: error: "int64_t"€™ does not name a type
 typedef int64_t  Sint64;

An obvious workaround is to edit SDL_stdinc.h but I want to avoid that since I'm going to distribute the game. Is there a way to fix the error?
mr_tawan


Joined: 13 Jan 2014
Posts: 161
Post Posted: Thu Apr 24, 2014 4:42 am
I haven't been using glm before, so I might be wrong. Looks like the int64_t typedef in fwd.h (of glm) is declared inside glm namespace. That should prevent name clashing.

Are you happen to use :-

Code:
using namespace glm;


somewhere in your code ? If so, you might want to remove that. You'd have to append glm:: in front of every glm's function calls.
k5748


Joined: 23 Apr 2014
Posts: 3
Post Posted: Thu Apr 24, 2014 11:48 am
You're right. Moving that after the sdl includes solved the problem. I still do not understand why it worked fine on my system and not on another, but now it's all ok. Thank you.
mr_tawan


Joined: 13 Jan 2014
Posts: 161
Post Posted: Thu Apr 24, 2014 5:26 pm
It's suggested against using "using namespace" in production code. It creates more problems than benefits.