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tshannon
 Post subject: Horde and Go
PostPosted: 09.02.2012, 00:53 
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Joined: 19.01.2012, 21:01
Posts: 55
I'm trying to build bindings for Horde for Go (http://golang.org/). It looks like it should be fairly straightforward, as Horde's API is C, and you can call C code fairly easily from Go (http://golang.org/cmd/cgo/).

When trying to build my code, I'm getting these errors, which seem to point to something in the Go compiler not liking how Horde3D.h is written.

Code:
/usr/local/include/horde3d/Horde3D.h:127:7: error: nested redefinition of âenum Listâ
  3 /usr/local/include/horde3d/Horde3D.h:127:7: error: redeclaration of âenum Listâ
  4 /usr/local/include/horde3d/Horde3D.h:89:7: note: originally defined here
  5 /usr/local/include/horde3d/Horde3D.h:161:7: error: nested redefinition of âenum Listâ
  6 /usr/local/include/horde3d/Horde3D.h:161:7: error: redeclaration of âenum Listâ
  7 /usr/local/include/horde3d/Horde3D.h:89:7: note: originally defined here
  8 /usr/local/include/horde3d/Horde3D.h:216:7: error: nested redefinition of âenum Listâ
  9 /usr/local/include/horde3d/Horde3D.h:216:7: error: redeclaration of âenum Listâ
 10 /usr/local/include/horde3d/Horde3D.h:89:7: note: originally defined here
 11 /usr/local/include/horde3d/Horde3D.h:244:7: error: nested redefinition of âenum Listâ
 12 /usr/local/include/horde3d/Horde3D.h:244:7: error: redeclaration of âenum Listâ
 13 /usr/local/include/horde3d/Horde3D.h:89:7: note: originally defined here
 14 /usr/local/include/horde3d/Horde3D.h:265:7: error: nested redefinition of âenum Listâ
 15 /usr/local/include/horde3d/Horde3D.h:265:7: error: redeclaration of âenum Listâ
 16 /usr/local/include/horde3d/Horde3D.h:89:7: note: originally defined here
 17 /usr/local/include/horde3d/Horde3D.h:288:7: error: nested redefinition of âenum Listâ
 18 /usr/local/include/horde3d/Horde3D.h:288:7: error: redeclaration of âenum Listâ
 19 /usr/local/include/horde3d/Horde3D.h:89:7: note: originally defined here
 20 /usr/local/include/horde3d/Horde3D.h:317:7: error: nested redefinition of âenum Listâ
 21 /usr/local/include/horde3d/Horde3D.h:317:7: error: redeclaration of âenum Listâ
 22 /usr/local/include/horde3d/Horde3D.h:89:7: note: originally defined here
 23 /usr/local/include/horde3d/Horde3D.h:320:3: error: redeclaration of enumerator âSamplerElemâ
 24 /usr/local/include/horde3d/Horde3D.h:291:3: note: previous definition of âSamplerElemâ was here
 25 /usr/local/include/horde3d/Horde3D.h:321:3: error: redeclaration of enumerator âUniformElemâ
 26 /usr/local/include/horde3d/Horde3D.h:292:3: note: previous definition of âUniformElemâ was here
 27 /usr/local/include/horde3d/Horde3D.h:323:3: error: redeclaration of enumerator âSampNameStrâ
 28 /usr/local/include/horde3d/Horde3D.h:296:3: note: previous definition of âSampNameStrâ was here
 29 /usr/local/include/horde3d/Horde3D.h:324:3: error: redeclaration of enumerator âUnifNameStrâ
 30 /usr/local/include/horde3d/Horde3D.h:298:3: note: previous definition of âUnifNameStrâ was here
 31 /usr/local/include/horde3d/Horde3D.h:349:7: error: nested redefinition of âenum Listâ
 32 /usr/local/include/horde3d/Horde3D.h:349:7: error: redeclaration of âenum Listâ
 33 /usr/local/include/horde3d/Horde3D.h:89:7: note: originally defined here
 34 /usr/local/include/horde3d/Horde3D.h:380:7: error: nested redefinition of âenum Listâ
 35 /usr/local/include/horde3d/Horde3D.h:380:7: error: redeclaration of âenum Listâ
 36 /usr/local/include/horde3d/Horde3D.h:89:7: note: originally defined here
 37 /usr/local/include/horde3d/Horde3D.h:408:7: error: nested redefinition of âenum Listâ
 38 /usr/local/include/horde3d/Horde3D.h:408:7: error: redeclaration of âenum Listâ
 39 /usr/local/include/horde3d/Horde3D.h:89:7: note: originally defined here
 40 /usr/local/include/horde3d/Horde3D.h:431:7: error: nested redefinition of âenum Listâ
 41 /usr/local/include/horde3d/Horde3D.h:431:7: error: redeclaration of âenum Listâ
 42 /usr/local/include/horde3d/Horde3D.h:89:7: note: originally defined here
 43 /usr/local/include/horde3d/Horde3D.h:433:3: error: redeclaration of enumerator âUndefinedâ
 44 /usr/local/include/horde3d/Horde3D.h:163:3: note: previous definition of âUndefinedâ was here
 45 /usr/local/include/horde3d/Horde3D.h:455:7: error: nested redefinition of âenum Listâ
 46 /usr/local/include/horde3d/Horde3D.h:455:7: error: redeclaration of âenum Listâ


It doesn't seem to like the multiple nested enum definition of List. Am I missing something obvious to you guys?

Here's how I have the initial go declaration:

Code:
   
package horde3d
 
   /*
   #cgo LDFLAGS: -llibHorde3D
   #include <horde3d/Horde3D.h>
   */
   import "C"
 
   /*
  func H3dInit() bool {
          return bool(C.h3dInit())
  }
  */


Basically anything in that first comment can be valid C code, so as long as the header file is valid C, it should compile fine.
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DarkAngel
 Post subject: Re: Horde and Go
PostPosted: 09.02.2012, 01:16 
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Joined: 08.11.2006, 03:10
Posts: 384
Location: Australia
I'm not sure if there's a better option, but in theory you can modify Horde3D.h yourself to remove the nested enums, e.g. replace this:
Code:
struct H3DOptions
{
        enum List
        {
         ...
/*and*/
DLL float h3dGetOption( H3DOptions::List param );
With this:
Code:
enum H3DOptionsList
{
 ...
/*and*/
DLL float h3dGetOption( H3DOptionsList param );
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tshannon
 Post subject: Re: Horde and Go
PostPosted: 09.02.2012, 18:47 
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Joined: 19.01.2012, 21:01
Posts: 55
I suppose I could, but ideally you'd be able to just make and install the standard SDK.

I'm wondering if the Horde3D.h file isn't C code but C++. Do I have the right header file? Is there a separate one for language bindings that only work with C?

For instances how do the lua and python bindings work?


Last edited by tshannon on 11.02.2012, 17:53, edited 1 time in total.

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tshannon
 Post subject: Re: Horde and Go
PostPosted: 11.02.2012, 16:29 
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Joined: 19.01.2012, 21:01
Posts: 55
yeah, it looks like the Horde header while C compatible, is not actually C code, so I'm going to have to write a C code only header.

I haven't touched C code in about a decade, so this could be interesting. There shouldn't be any issues with using a C header with the C++ library right? I'm going to have to change all of the bools to ints and fix the enums, but I think it should work.
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