| Issue |
71655
|
| Summary |
OpenCL C source that does not use image functions cannot be compiled on OpenCL 3.0 devices without image support
|
| Labels |
|
| Assignees |
|
| Reporter |
Oblomov
|
This issue was discovered with PoCL updating their CUDA device support to OpenCL 3.0, as reported [in this PoCL issue](https://github.com/pocl/pocl/issues/1339). The PoCL CUDA device does not support images, so it does not define the `__opencl_c_images` extension.
As a result, when `opencl-c.h` is included to build *any* device code (even device code that does not make use of image functions or types), the compilation produces 172 errors to the tune of
```
error: /usr/local/lib/../share/pocl/include/opencl-c.h:15178:46: use of type '__read_only image2d_t' requires __opencl_c_images support
```
This has been observed with LLVM 14, 15 and 16 at least.
I believe this is due to the “core” image functions in `opencl-c.h` being declared without proper fencing. The whole section of the header should be fenced by an
```
#if defined(__IMAGE_SUPPORT__) || defined(__opencl_c_images)
```
or similar.
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