help working with cgo on windows

[qeed qeed]

Hi, I am trying to get SDL and GLEW to work on the windows port. I am
using windows 64 bit using the 6g compilers. I used mingw64 and msys
that I got from

http://sourceforge.net/projects/mingw-w64/files/latest/download?source=files

I compiled SDL from source for mingw and installed it to /usr/local/.
For GLEW i just copied the binary distribution into the top mingw
folder. I can compile a C SDL/GLEW application from mingw using

cc -o app app.c `sdl-config --cflags --libs` -lglew -I/usr/include -
lopengl32

and it seems to work.

but trying cgo on windows with this code

package main

// #cgo windows CFLAGS: -I/usr/local/include/SDL -D_GNU_SOURCE=1
// #cgo windows LDFLAGS: -lglew32 -lopengl32
// #include <SDL.h>
import "C"

func main() {
}

and i got SDL.h no such file or directory when i try to build. I am
not sure what flags I should pass to the CFLAGS, other than the
include which i gotten from sdl-config. I tried changed the /usr/
directory to /c/ming64/local/include and C:\ming64\local\include\ in
case it used that naming convention

Not sure how to get that to work. Any hints is appreciated, thanks.

[Jared Anderson]

You need to use a windows path.  The link you gave does not include

msys as far as I can tell so I'm not sure how you set that up.  Based

on the information you gave I am guessing you want something like

C:\ming64\msys\1.0\local\include\SDL.

[minux]

On Mon, May 7, 2012 at 1:48 AM, qeed qeed <qeed...@gmail.com> wrote:

cc -o app app.c `sdl-config --cflags --libs` -lglew -I/usr/include -
lopengl32

and it seems to work.

but trying cgo on windows with this code

package main

// #cgo windows CFLAGS: -I/usr/local/include/SDL -D_GNU_SOURCE=1

#cgo CFLAGS: .... 

// #cgo windows LDFLAGS: -lglew32 -lopengl32

ditto 

[qeed qeed]

i have changed the flags and this is my test case now


/*
package main

/*
#cgo CFLAGS: -IC:\mingw64\local\include
#cgo LDFLAGS: -LC:\mingw64\local\lib -lmingw32 -lSDL
#include <SDL.h>
*/
import "C"

func main() {
C.SDL_Init(C.SDL_INIT_EVERYTHING)
}

and it still cant find the SDL header.

To be specific my mingw folder is

C:\mingw64 and all of msys is in the top level ie, C:\mingw64\bin will
have bash.exe etc. I wanted to make this specific because mingw64 is
separate from msys and you have to install that manually.
my sdl headers are in C:\mingw64\local\include\SDL
and the sdl libs are in C:\mingw64\local\lib
is there anyway to see more error message from cgo as in what path is
it doing or if it can find the paths?

[qeed qeed]

hmm this works now
package main

/*
#cgo CFLAGS: -IC:/mingw64/local/include/SDL -IC:/mingw64/include
#cgo LDFLAGS: -LC:/mingw64/local/lib -lmingw32 -lSDLmain -lSDL -
lglew32 -lopengl32
#include <SDL.h>
#include <GL/glew.h>
*/
import "C"
import "runtime"

func main() {
runtime.LockOSThread()
C.SDL_Init(C.SDL_INIT_EVERYTHING)
C.SDL_SetVideoMode(800, 600, 32, C.SDL_OPENGL)
C.glewInit()
for {
C.glClear(C.GL_COLOR_BUFFER_BIT)
C.glClearColor(.4,.4,.4,.4)
C.SDL_GL_SwapBuffers()
}
}

thanks for the help.