tokio: add riscv32 to non atomic64 architectures #4185
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Motivation
Attempting to build a tokio based project for the
riscv32target architecture results in a compilation failure, due to lack ofAtomicU64. The macro that checks this condition is based on a static list of architectures. Theriscv32architecture is not included in this check, so it defaults tostdsupport forAtomicU64, which is incorrect.riscv32does not have 64-bit atomics.Solution
This PR simply adds
riscv32to the list of known architectures which do not have nativeAtomicU64. I've verified locally that projects build after this change.