vcl: examples not working

[Eliyaan]

Describe the bug

vcl does not find devices

Expected Behavior

No crashes

Current Behavior

…/vsl/examples/vcl_opencl_basic 
> v run .
V panic: result not set (vcl_cl: Device Not Found)
v hash: 6cbffd5
/tmp/v_1000/vcl_opencl_basic.01JYYNV1YTVSVVQ01DJQ7YVH9T.tmp.c:7744: at _v_panic: Backtrace
/tmp/v_1000/vcl_opencl_basic.01JYYNV1YTVSVVQ01DJQ7YVH9T.tmp.c:7706: by panic_result_not_set
/tmp/v_1000/vcl_opencl_basic.01JYYNV1YTVSVVQ01DJQ7YVH9T.tmp.c:12418: by main__main
/tmp/v_1000/vcl_opencl_basic.01JYYNV1YTVSVVQ01DJQ7YVH9T.tmp.c:12609: by main

Reproduction Steps

…/vsl/examples/vcl_opencl_basic
> v run .

Possible Solution

No response

Additional Information/Context

No response

V version

V 0.4.10

Version used

ran v install vsl to update it

Environment details (OS name and version, etc.)

|V full version      |V 0.4.11 6cbffd53ba3e36764de579e5e758bc7b962d0632
|:-------------------|:-------------------
|OS                  |linux, "Void Linux"
|Processor           |4 cpus, 64bit, little endian, Intel(R) Pentium(R) Gold 7505 @ 2.00GHz
|Memory              |1.59GB/7.45GB
|                    |
|V executable        |/home/nopana/v/v
|V last modified time|2025-06-29 20:25:01
|                    |
|V home dir          |OK, value: /home/nopana/v
|VMODULES            |OK, value: /home/nopana/.vmodules
|VTMP                |OK, value: /tmp/v_1000
|Current working dir |OK, value: /home/nopana/.vmodules/vsl/examples/vcl_opencl_basic
|                    |
|Git version         |git version 2.49.0
|V git status        |0.4.10-493-g6cbffd53
|.git/config present |true
|                    |
|cc version          |cc (GCC) 13.2.0
|gcc version         |gcc (GCC) 13.2.0
|clang version       |clang version 17.0.6
|tcc version         |tcc version 0.9.28rc 2025-02-13 HEAD@f8bd136d (x86_64 Linux)
|tcc git status      |thirdparty-linux-amd64 696c1d84
|emcc version        |N/A
|glibc version       |ldd (GNU libc) 2.41

[JalonSolov]

I also see an error on my system. When I first attempted to run it, I got this:

builder error: 'CL/cl.h' not found

Would be nice to have a better message, saying to install it. I found and installed opencl-headers package, and then got the error (this output is with adding -g switch):

$ v -g run .
================ V panic ================
   module: main
 function: main()
  message: vcl_cl: error -1001
     file: ./main.v:14
   v hash: efc8f7f
      pid: 0x13a60e
      tid: 0x13a60e
=========================================
/home/jalon/git/v/vlib/builtin/panicing.c.v:44: at builtin__panic_debug: Backtrace
/home/jalon/git/vsl/examples/vcl_opencl_basic/main.v:15: by main__main
/home/jalon/git/v/vlib/builtin/closure/closure.c.v:226: by main
$