Setup Linux RISCV64 toolchain.

.github/workflows/dart.yaml

@@ -82,7 +82,7 @@ jobs:
         if: ${{ matrix.sdk == 'stable' }}
 
       - name: Install native toolchains
-        run: sudo apt-get update && sudo apt-get install clang-15 gcc-i686-linux-gnu gcc-aarch64-linux-gnu gcc-arm-linux-gnueabihf
+        run: sudo apt-get update && sudo apt-get install clang-15 gcc-i686-linux-gnu gcc-aarch64-linux-gnu gcc-arm-linux-gnueabihf gcc-riscv64-linux-gnu
         if: ${{ matrix.sdk == 'stable' && matrix.os == 'ubuntu' }}
 
       - run: dart test

.github/workflows/native_toolchain_c.yaml

@@ -44,7 +44,7 @@ jobs:
       - run: dart pub get
 
       - name: Install native toolchains
-        run: sudo apt-get update && sudo apt-get install gcc-i686-linux-gnu gcc-aarch64-linux-gnu gcc-arm-linux-gnueabihf
+        run: sudo apt-get update && sudo apt-get install gcc-i686-linux-gnu gcc-aarch64-linux-gnu gcc-arm-linux-gnueabihf gcc-riscv64-linux-gnu
         if: ${{ matrix.sdk == 'stable' && matrix.os == 'ubuntu' }}
 
       - run: git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git

pkgs/native_toolchain_c/lib/src/cbuilder/compiler_resolver.dart

@@ -74,6 +74,8 @@ class CompilerResolver {
           return aarch64LinuxGnuGcc;
         case Architecture.ia32:
           return i686LinuxGnuGcc;
+        case Architecture.riscv64:
+          return riscv64LinuxGnuGcc;
       }
     }
 
@@ -158,6 +160,8 @@ class CompilerResolver {
           return aarch64LinuxGnuGccAr;
         case Architecture.ia32:
           return i686LinuxGnuGccAr;
+        case Architecture.riscv64:
+          return riscv64LinuxGnuGccAr;
       }
     }
     if (host.os == OS.windows) {

pkgs/native_toolchain_c/lib/src/native_toolchain/gcc.dart

@@ -47,6 +47,15 @@ final aarch64LinuxGnuGccAr = _gnuArchiver('aarch64-linux-gnu');
 /// [gnuLinker] with [Tool.defaultResolver] for [Architecture.arm64].
 final aarch64LinuxGnuLd = _gnuLinker('aarch64-linux-gnu');
 
+/// [gcc] with [Tool.defaultResolver] for [Architecture.riscv64].
+final riscv64LinuxGnuGcc = _gcc('riscv64-linux-gnu');
+
+/// [gnuArchiver] with [Tool.defaultResolver] for [Architecture.riscv64].
+final riscv64LinuxGnuGccAr = _gnuArchiver('riscv64-linux-gnu');
+
+/// [gnuLinker] with [Tool.defaultResolver] for [Architecture.riscv64].
+final riscv64LinuxGnuLd = _gnuLinker('riscv64-linux-gnu');
+
 Tool _gcc(String prefix) => Tool(
       name: gcc.name,
       defaultResolver: CliVersionResolver(

pkgs/native_toolchain_c/test/cbuilder/cbuilder_cross_linux_host_test.dart

@@ -24,14 +24,16 @@ void main() {
     Target.linuxArm,
     Target.linuxArm64,
     Target.linuxIA32,
-    Target.linuxX64
+    Target.linuxX64,
+    Target.linuxRiscv64,
   ];
 
   const readElfMachine = {
     Target.linuxArm: 'ARM',
     Target.linuxArm64: 'AArch64',
     Target.linuxIA32: 'Intel 80386',
     Target.linuxX64: 'Advanced Micro Devices X86-64',
+    Target.linuxRiscv64: 'RISC-V',
   };
 
   for (final linkMode in LinkMode.values) {

pkgs/native_toolchain_c/test/native_toolchain/gcc_test.dart

@@ -59,4 +59,10 @@ void main() {
     i686LinuxGnuGccAr,
     i686LinuxGnuLd,
   ]);
+
+  testToolSet('riscv64LinuxGnuGcc', [
+    riscv64LinuxGnuGcc,
+    riscv64LinuxGnuGccAr,
+    riscv64LinuxGnuLd,
+  ]);
 }

pkgs/native_toolchain_c/test/native_toolchain/recognizer_test.dart

@@ -39,6 +39,9 @@ void main() async {
     RecognizerTest(link, LinkerRecognizer.new),
     RecognizerTest(lld, LinkerRecognizer.new),
     RecognizerTest(llvmAr, ArchiverRecognizer.new),
+    RecognizerTest(riscv64LinuxGnuGcc, CompilerRecognizer.new),
+    RecognizerTest(riscv64LinuxGnuGccAr, ArchiverRecognizer.new),
+    RecognizerTest(riscv64LinuxGnuLd, LinkerRecognizer.new),
   ];
 
   for (final test in tests) {