Vulkan Ada binding and linking error on Windows 10

Vulkan Ada binding and linking error on Windows 10

[joakimds]

Hi!

The development progress on an Ada binding to Vulkan is now halted due to the following linker error on Windows 10:
gprbuild -PD:\projects\vulkan\examples\query_vulkan_for_information\default.gpr main.adb -p -j4 -d
gcc -c main.adb
gcc -c vk.ads
gprlib.exe vulkan_ada.lexch
ar.exe cr D:\projects\vulkan\lib\libvulkan_ada.a D:\projects\vulkan\obj\vk.o
ranlib.exe libvulkan_ada.a
gprbind main.bexch
gnatbind main.ali
gcc -c b__main.adb
gcc main.o -LC:/VulkanSDK/1.0.21.1/Bin32/ -lvulkan-1 -o main.exe
main.o:main.adb:(.text+0x104): undefined reference to `vkCreateInstance'
collect2.exe: error: ld returned 1 exit status
gprbuild: link of main.adb failed

The source code can be found here:
https://github.com/joakim-strandberg/vulkan

It is under the /examples/query_vulkan_for_information/ directory that the source code for the application that does not pass the linker stage can be found. I am using GNAT GPL 2016 on Windows 10.

An equivalent C++ application can found here:
https://github.com/joakim-strandberg/temp_cpp_vulkan
The C++ application builds without error. Why doesn't the Ada application build? Is there anyone on comp.lang.ada that can shed light on this?

For somebody totally new to Vulkan one can imagine Vulkan as "the latest version of OpenGL". To get started an update of the graphics driver to a new version that supports Vulkan may be needed followed by installation of the Vulkan SDK. More information can be found here:
https://lunarg.com/

Best regards,
Joakim Strandberg

Re: Vulkan Ada binding and linking error on Windows 10

[G.B.]

On 10.10.16 23:29, joakimds@kth.se wrote:
> ranlib.exe libvulkan_ada.a
> gprbind main.bexch
> gnatbind main.ali
> gcc -c b__main.adb
> gcc main.o -LC:/VulkanSDK/1.0.21.1/Bin32/ -lvulkan-1 -o main.exe

A shot from the hip: -lvulkan-1 does not match libvulkan_ada.a,
That's assuming that your gcc can link using .a files.
I guess you did notice that.

-- 
"HOTDOGS ARE NOT BOOKMARKS"
Springfield Elementary teaching staff

Re: Vulkan Ada binding and linking error on Windows 10

[joakimds]

> A shot from the hip: -lvulkan-1 does not match libvulkan_ada.a,
> That's assuming that your gcc can link using .a files.
> I guess you did notice that.

Thanks for the suggestion. However, the reference to `vkCreateInstance' still remains unresolved:

gcc main.o -LC:/VulkanSDK/1.0.21.1/Bin32/ -lvulkan-1 -lvulkan_ada -o main.exe
main.o:main.adb:(.text+0x104): undefined reference to `vkCreateInstance'
collect2.exe: error: ld returned 1 exit status
gprbuild: link of main.adb failed

Not sure why the C++ version of the application links with the C-library but the Ada version does not... to be continued...

Re: Vulkan Ada binding and linking error on Windows 10

[joakimds]

I have managed to get past the linker stage by changing

pragma Import (C, Create_Instance, "vkCreateInstance"); ---> pragma Import (StdCall, Create_Instance, "vkCreateInstance");

Now I have other issues but in run-time. Hopefully I can sort it out soon. To be continued...

Re: Vulkan Ada binding and linking error on Windows 10

[Olivier Henley]

Hi Joakim!

Have you check Lucretia's work? 

https://github.com/Lucretia/adavulkan

How does your binding differs?

Thx!

Re: Vulkan Ada binding and linking error on Windows 10

[Luke A. Guest]

Olivier Henley <olivier.henley@gmail.com> wrote:
> Hi Joakim!
> 
> Have you check Lucretia's work? 
> 
> https://github.com/Lucretia/adavulkan
> 
> How does your binding differs?
> 
> Thx!
> 
> 

I haven't published mine yet. There's room for multiple versions.

Re: Vulkan Ada binding and linking error on Windows 10

[mariloup.champagne]

kk, didnt know your repo wasnt complete. my bad.

Re: Vulkan Ada binding and linking error on Windows 10

[Olivier Henley]

kk. did not notice your repo was not complete. my bad.

Re: Vulkan Ada binding and linking error on Windows 10

[joakimds]

Den fredag 14 oktober 2016 kl. 16:20:23 UTC+2 skrev Olivier Henley:
> Hi Joakim!
> 
> Have you check Lucretia's work? 
> 
> https://github.com/Lucretia/adavulkan
> 
> How does your binding differs?
> 
> Thx!

Hi Olivier!

Yes, I've been aware of his repository. Even though Lucretia hasn't updated his repository in over 6 months it has been useful to me when making a Vulkan binding.

I agree with Lucretia, there's room for multiple versions and look forward to see his version when it's good and ready.

With the corrections to the Vulkan binding I made tonight it is finally possible to make at least one call to the Vulkan API successfully (the Vk.Create_Instance (..) function).