• eskaypee (22/22) Dec 13 2017 I'm on Linux 64 bit, all SDL libraries (-dev versions) are
• Mike Parker (3/15) Dec 14 2017 Yes, you need to link with SDL_image.
• eskaypee (6/7) Dec 14 2017 Sorry Mike, just noticed the end of my original question was
• Mike Parker (3/12) Dec 14 2017 Should be:
• eskaypeee (10/12) Dec 14 2017 Thank you, it now works. I think I did try that but in lower

eskaypee <eskaypee example.com> writes:

I'm on Linux 64 bit, all SDL libraries (-dev versions) are 
installed, dub is set up with:

     "dependencies": {
     "derelict-sdl2": "~>3.0.0-beta"
     },
     "subConfigurations": {
     "derelict-sdl2": "derelict-sdl2-static"
     },
     "libs":
     ["sdl2"]

All the SDL core library functions work fine but when I try to 
use SDL_image library's IMG_Load() or IMG_LoadTexture() I get a 
linker error, for example:

undefined reference to `IMG_LoadTexture'
collect2: error: ld returned 1 exit status
Error: linker exited with status 1
dmd failed with exit code 1.

I have:
import derelict.sdl2.image;

at the top of my program. I'm guessing that the "libs" section of 
my dub subConfiguration needs to include the name of the image 
satellite library?

Mike Parker <aldacron gmail.com> writes:

On Wednesday, 13 December 2017 at 20:59:41 UTC, eskaypee wrote:
 I'm on Linux 64 bit, all SDL libraries (-dev versions) are 
 installed, dub is set up with:

     "dependencies": {
     "derelict-sdl2": "~>3.0.0-beta"
     },
     "subConfigurations": {
     "derelict-sdl2": "derelict-sdl2-static"
     },
     "libs":
     ["sdl2"]

 I'm guessing that the "libs" section of my dub subConfiguration 
 needs to include the name of the image satellite library?

Yes, you need to link with SDL_image.

https://www.libsdl.org/projects/SDL_image/

eskaypee <eskaypee example.com> writes:

On Thursday, 14 December 2017 at 14:45:51 UTC, Mike Parker wrote:
 Yes, you need to link with SDL_image.

Sorry Mike, just noticed the end of my original question was 
missing: I have SDL_Image installed (dev version) but can't see 
how to refer/add it to the "libs" section (if that's how it gets 
linked in?). Totally new to D, dub and SDL and using only a text 
editor rather than an IDE so a bit befuddled!

Mike Parker <aldacron gmail.com> writes:

On Thursday, 14 December 2017 at 15:07:12 UTC, eskaypee wrote:
 On Thursday, 14 December 2017 at 14:45:51 UTC, Mike Parker 
 wrote:
 Yes, you need to link with SDL_image.

 Sorry Mike, just noticed the end of my original question was 
 missing: I have SDL_Image installed (dev version) but can't see 
 how to refer/add it to the "libs" section (if that's how it 
 gets linked in?). Totally new to D, dub and SDL and using only 
 a text editor rather than an IDE so a bit befuddled!

Should be:

"libs" : [ "SDL2_image", "SDL2"]

eskaypeee <eskaypee example.com> writes:

On Thursday, 14 December 2017 at 15:43:22 UTC, Mike Parker wrote:
 Should be:

 "libs" : [ "SDL2_image", "SDL2"]

Thank you, it now works. I think I did try that but in lower 
case, which didn't work. I was following the example dub file on 
this page: http://derelictorg.github.io/packages/sdl2/ which uses 
lower case...

  "libs": ["sdl2"]

However, I now find that I can reference that core library in 
upper or lower case in dub.json whereas 'SDL2_image' has to be in 
that precise case. Maybe something to do with symlinks on my 
computer...?