rust: Add support for riscv64

pkgs/development/compilers/rust/1_52.nix

@@ -47,6 +47,7 @@ import ./default.nix {
     x86_64-apple-darwin = "765212098a415996b767d1e372ce266caf94027402b269fec33291fffc085ca4";
     aarch64-apple-darwin = "95d0410bbd20b05f8b7d5adf70e8737873995bc86611a90e643d7081ca35147f";
     powerpc64le-unknown-linux-gnu = "7362f561104d7be4836507d3a53cd39444efcdf065813d559beb1f54ce9f7680";
+    riscv64gc-unknown-linux-gnu = "9d0c2c4ab2397e78758de8b6b57051482bcf20b6748e0e16d9d5bd23ce73d72a";
   };
 
   selectRustPackage = pkgs: pkgs.rust_1_52;

pkgs/development/compilers/rust/default.nix

@@ -36,6 +36,7 @@
       "armv7l" = "armv7";
       "armv6l" = "arm";
       "armv5tel" = "armv5te";
+      "riscv64" = "riscv64gc";
     }.${cpu.name} or cpu.name;
   in platform.rustc.config
     or "${cpu_}-${vendor.name}-${kernel.name}${lib.optionalString (abi.name != "unknown") "-${abi.name}"}";

pkgs/development/compilers/rust/print-hashes.sh

@@ -18,6 +18,7 @@ PLATFORMS=(
   x86_64-apple-darwin
   aarch64-apple-darwin
   powerpc64le-unknown-linux-gnu
+  riscv64gc-unknown-linux-gnu
 )
 BASEURL=https://static.rust-lang.org/dist
 VERSION=${1:-}