ci: add build coverage for riscv64 (#42431)

.github/workflows/build-test.sh

@@ -96,6 +96,9 @@ if [[ -n "$CROSS_ARCH" ]]; then
         armhf)
             triplet=arm-linux-gnueabihf
             ;;
+        riscv64)
+            triplet=riscv64-linux-gnu
+            ;;
         *)
             fatal "Unsupported cross architecture: $CROSS_ARCH"
             ;;

.github/workflows/build-test.yml

@@ -42,6 +42,9 @@ jobs:
           - env: { COMPILER: "gcc",   COMPILER_VERSION: "13", LINKER: "bfd", CROSS_ARCH: "armhf"  }
             runner: [ ubuntu-24.04-arm ]
             python-version: ''
+          - env: { COMPILER: "gcc",   COMPILER_VERSION: "13", LINKER: "bfd", CROSS_ARCH: "riscv64"  }
+            runner: [ ubuntu-24.04-arm ]
+            python-version: ''
           - env: { COMPILER: "clang", COMPILER_VERSION: "18", LINKER: "lld"  }
             runner: [ ubuntu-24.04-s390x ]
             python-version: ''

.github/workflows/riscv64-gcc.cross

@@ -0,0 +1,21 @@
+[binaries]
+c = 'riscv64-linux-gnu-gcc'
+cpp = 'riscv64-linux-gnu-g++'
+ar = 'riscv64-linux-gnu-gcc-ar'
+nm = 'riscv64-linux-gnu-gcc-nm'
+strip = 'riscv64-linux-gnu-strip'
+pkgconfig = 'pkg-config'
+
+[properties]
+needs_exe_wrapper = true
+pkg_config_libdir = '/usr/lib/riscv64-linux-gnu/pkgconfig:/usr/share/pkgconfig'
+c_args = ['-O2', '-pipe', '-g', '-feliminate-unused-debug-types']
+c_link_args = ['-fuse-ld=bfd', '-Wl,-O1', '-Wl,--hash-style=gnu', '-Wl,--as-needed', '-Wl,-z,relro,-z,now,-z,noexecstack']
+cpp_args = []
+cpp_link_args = ['-fuse-ld=bfd', '-Wl,-O1', '-Wl,--hash-style=gnu', '-Wl,--as-needed', '-Wl,-z,relro,-z,now,-z,noexecstack']
+
+[host_machine]
+system = 'linux'
+cpu_family = 'riscv64'
+cpu = 'riscv64'
+endian = 'little'