Enable RISC-V atomic compare and swap

diff --git a/src/librustc_target/spec/riscv32imac_unknown_none_elf.rs b/src/librustc_target/spec/riscv32imac_unknown_none_elf.rs
index b199a50f0ca389a3d8faa5e0e37c54481823fde9..f05a5712f5acf8e5879c3067737d7c08c4f04957 100644 (file)
--- a/src/librustc_target/spec/riscv32imac_unknown_none_elf.rs
+++ b/src/librustc_target/spec/riscv32imac_unknown_none_elf.rs
@@ -28,7 +28,7 @@ pub fn target() -> TargetResult {
             linker: Some("rust-lld".to_string()),
             cpu: "generic-rv32".to_string(),
             max_atomic_width: Some(32),
-            atomic_cas: false, // incomplete +a extension
+            atomic_cas: true,
             features: "+m,+a,+c".to_string(),
             executables: true,
             panic_strategy: PanicStrategy::Abort,