macOS 10.14.6 Mandelbrot produces 100% blue image

[unphased]

Looks like compiling works, but something's broken with OpenCL. The Mandelbrot code will produce this output

CPU Time: 6.58481s   
GPU Time: 0.000594s 
Error: 89.5501%     

for all 3 devices on platform 0 on this machine:

~/D/C/builddir ❯❯❯ ./clinfo                                       master ca32f9a ✱ ◼
================================================================================
Platform: Apple OpenCL 1.2 (Oct 25 2019 05:16:10)
Vendor: Apple (FULL_PROFILE)
Supported Extensions:

        cl_APPLE_SetMemObjectDestructor
        cl_APPLE_ContextLoggingFunctions
        cl_APPLE_clut
        cl_APPLE_query_kernel_names
        cl_APPLE_gl_sharing
        cl_khr_gl_event

Available Devices:

        Device: Intel Intel(R) Core(TM) i7-7820HQ CPU @ 2.90GHz
        Type: CPU (64-bit @ 2900 MHz)
        Supported Extensions:

                cl_APPLE_SetMemObjectDestructor
                cl_APPLE_ContextLoggingFunctions
                cl_APPLE_clut
                cl_APPLE_query_kernel_names
                cl_APPLE_gl_sharing
                cl_khr_gl_event
                cl_khr_fp64
                cl_khr_global_int32_base_atomics
                cl_khr_global_int32_extended_atomics
                cl_khr_local_int32_base_atomics
                cl_khr_local_int32_extended_atomics
                cl_khr_byte_addressable_store
                cl_khr_int64_base_atomics
                cl_khr_int64_extended_atomics
                cl_khr_3d_image_writes
                cl_khr_image2d_from_buffer
                cl_APPLE_fp64_basic_ops
                cl_APPLE_fixed_alpha_channel_orders
                cl_APPLE_biased_fixed_point_image_formats
                cl_APPLE_command_queue_priority

        Device: Intel Inc. Intel(R) HD Graphics 630
        Type: GPU (64-bit @ 1100 MHz)
        Supported Extensions:

                cl_APPLE_SetMemObjectDestructor
                cl_APPLE_ContextLoggingFunctions
                cl_APPLE_clut
                cl_APPLE_query_kernel_names
                cl_APPLE_gl_sharing
                cl_khr_gl_event
                cl_khr_global_int32_base_atomics
                cl_khr_global_int32_extended_atomics
                cl_khr_local_int32_base_atomics
                cl_khr_local_int32_extended_atomics
                cl_khr_byte_addressable_store
                cl_khr_image2d_from_buffer
                cl_khr_gl_depth_images
                cl_khr_depth_images
                cl_khr_3d_image_writes

        Device: AMD AMD Radeon Pro 560 Compute Engine
        Type: GPU (32-bit @ 300 MHz)
        Supported Extensions:

                cl_APPLE_SetMemObjectDestructor
                cl_APPLE_ContextLoggingFunctions
                cl_APPLE_clut
                cl_APPLE_query_kernel_names
                cl_APPLE_gl_sharing
                cl_khr_gl_event
                cl_khr_global_int32_base_atomics
                cl_khr_global_int32_extended_atomics
                cl_khr_local_int32_base_atomics
                cl_khr_local_int32_extended_atomics
                cl_khr_byte_addressable_store
                cl_khr_image2d_from_buffer
                cl_khr_depth_images
                cl_APPLE_command_queue_priority
                cl_APPLE_command_queue_select_compute_units
                cl_khr_fp64

================================================================================

When not specifying a device (0 is chosen) we see the output Compile Server Error. When specifying device 1 we see the output No kernels or only kernel prototypes found. When specifying device 2 we see no output but the same all blue result is produced.

Also I know that OpenCL works on this system because I've gotten the code from here to work and produce the right result.

Although my research indicates that Apple's OpenCL has bugs and Apple is not supporting OpenCL much anymore.

[Polytonic]

Hmm. I just ran this locally with a fresh clone on both my Intel i7-4980HQ and NVIDIA GeForce GT 750M and it output the correct image.

What compiler are you using? For reference:

$ c++ --version
Apple clang version 11.0.0 (clang-1100.0.33.16)
Target: x86_64-apple-darwin19.3.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin