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riscv32imc_esp_espidf: set max_atomic_width to 64 #94292

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Feb 24, 2022
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riscv32imc_esp_espidf: set max_atomic_width to 64 #94292

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4 changes: 2 additions & 2 deletions compiler/rustc_target/src/spec/riscv32imc_esp_espidf.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -18,11 +18,11 @@ pub fn target() -> Target {
cpu: "generic-rv32".to_string(),

// While the RiscV32IMC architecture does not natively support atomics, ESP-IDF does support
// the __atomic* and __sync* GCC builtins, so setting `max_atomic_width` to `Some(32)`
// the __atomic* and __sync* GCC builtins, so setting `max_atomic_width` to `Some(64)`
// and `atomic_cas` to `true` will cause the compiler to emit libcalls to these builtins.
//
// Support for atomics is necessary for the Rust STD library, which is supported by the ESP-IDF framework.
max_atomic_width: Some(32),
max_atomic_width: Some(64),
atomic_cas: true,

features: "+m,+c".to_string(),
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