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404FileNotFound
Joined: 20 Aug 2005
Posts: 18
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 Posted: Sat Aug 20, 2005 2:17 am Post subject: weird linux error |
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I'm using dmd 0.129 on ubuntu linux and I get the following error when trying to compile a simple test program (the only thing it does is call DerelictSDL_Load() ).
| Code: | derelict/util/loader.o(.gnu.linkonce.t_D8derelict4util6loader22Platform_LoadSharedLibFAaZC8derelict4util6loader9SharedLib+0x15): In function `_D8derelict4util6loader22Platform_LoadSharedLibFAaZC8derelict4util6loader9SharedLib':
: undefined reference to `dlopen'
derelict/util/loader.o(.gnu.linkonce.t_D8derelict4util6loader24Platform_UnloadSharedLibFC8derelict4util6loader9SharedLibZv+0xf): In function `_D8derelict4util6loader24Platform_UnloadSharedLibFC8derelict4util6loader9SharedLibZv':
: undefined reference to `dlclose'
derelict/util/loader.o(.gnu.linkonce.t_D8derelict4util6loader16Platform_GetProcFC8derelict4util6loader9SharedLibAaZPv+0x19): In function `_D8derelict4util6loader16Platform_GetProcFC8derelict4util6loader9SharedLibAaZPv':
: undefined reference to `dlsym'
collect2: ld gaf exit-status 1 terug
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Compiling derelictSDL and derelictUtil worked ok I think, Does anyone know what Im doing wrong here and how I can fix it? |
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JJR
Joined: 22 Feb 2004
Posts: 1104
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| Posted: Sat Aug 20, 2005 1:19 pm Post subject: |
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Yep. You are not linking with linux's libdl shared library. Notice that the undefined symbols are dlopen, dlclose, dlsym, etc.
You won't see these errors when compiling Derelict to a library because you haven't actually performed a link stage at that point.
To fix this, just add "-L-ldl" to your dmd project command line. That should direct the linker to search dl library to locate the required symbols.
Another option is to add that same flag to dmd.conf's DFLAGS line. That way you don't have to remember to add it to your dmd command line each time. The dynamic loader library is usually important to most d programs anyway.
Hope that helps.
-JJR |
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JJR
Joined: 22 Feb 2004
Posts: 1104
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| Posted: Sat Aug 20, 2005 1:29 pm Post subject: |
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In fact, to make things easier, all the linux versions of the derelict examples should be updated to include a pragma (lib, "dl") for the build process. They probably won't work otherwise. Yet, I'm not sure if dmd on linux supports the same directive. The build tool's equivalent pragma would suffice, if that were the case.
-JJR |
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404FileNotFound
Joined: 20 Aug 2005
Posts: 18
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| Posted: Sun Aug 21, 2005 12:28 am Post subject: |
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| Thanks that worked. I was using some eclipse plugin so I couldn't really add something to the cmd line, but I added it to the dmd.conf file and that did the trick. |
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404FileNotFound
Joined: 20 Aug 2005
Posts: 18
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| Posted: Mon Aug 22, 2005 5:36 am Post subject: |
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Ok so I've got another question 
is it possible to use opengl from derelictSDL? I noticed there isn't a sdl_opengl.h wrapper. Or am I supposed to use derelictGL for this? |
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aldacron
Joined: 05 May 2004
Posts: 1322
Location: Seoul, South Korea
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| Posted: Mon Aug 22, 2005 5:41 am Post subject: |
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| 404FileNotFound wrote: | Ok so I've got another question
is it possible to use opengl from derelictSDL? I noticed there isn't a sdl_opengl.h wrapper. Or am I supposed to use derelictGL for this? |
Yes, just use DerelictGL.
sdl_opengl.h exists because of the platform differences between OpenGL headers in the C world. For example, on Windows gl.h requires types defined in windows.h, and on Mac the path is non-standard. sdl_opengl.h hides all of this. We don't need that in DerelictSDL because all of the types and declarations you need are available in DerelictGL. SDL creates the OpenGL context for you, and then you can make gl calls through any means available (DerelictGL, another gl binding for D, or perhaps even a C library you've linked to). |
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404FileNotFound
Joined: 20 Aug 2005
Posts: 18
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| Posted: Mon Aug 22, 2005 6:05 am Post subject: |
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| Ok thanks a bunch, I'll try that |
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