33add367e2
The `gpu-kernel` calling convention has several restrictions that were not enforced by the compiler until now. Add the following restrictions: 1. Cannot be async 2. Cannot be called 3. Cannot return values, return type must be `()` or `!` 4. Arguments should be primitives, i.e. passed by value. More complicated types can work when you know what you are doing, but it is rather unintuitive, one needs to know ABI/compiler internals. 5. Export name should be unmangled, either through `no_mangle` or `export_name`. Kernels are searched by name on the CPU side, having a mangled name makes it hard to find and probably almost always unintentional.
15 lines
479 B
Text
15 lines
479 B
Text
error: invalid signature for `extern "gpu-kernel"` function
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--> $DIR/cannot-return.rs:17:37
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LL | extern "gpu-kernel" fn ret_i32() -> i32 { 0 }
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| ^^^
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= note: functions with the "gpu-kernel" ABI cannot have a return type
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help: remove the return type
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--> $DIR/cannot-return.rs:17:37
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LL | extern "gpu-kernel" fn ret_i32() -> i32 { 0 }
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| ^^^
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error: aborting due to 1 previous error
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