Add basic tools

toolchain/aarch64.cross-file

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+[binaries]
+c = 'clang'
+cpp = 'clang++'
+ar = 'llvm-ar'
+strip = 'llvm-strip'
+objcopy = 'llvm-objcopy'
+ld = 'ld.lld'
+
+[built-in options]
+c_args = ['-target', 'aarch64-unknown-none']
+cpp_args = ['-target', 'aarch64-unknown-none']
+c_link_args = ['--target=aarch64-unknown-linux-gnu', '-fuse-ld=lld']
+cpp_link_args = ['--target=aarch64-unknown-linux-gnu', '-fuse-ld=lld']
+
+[host_machine]
+system = 'linux'
+cpu_family = 'aarch64'
+cpu = 'aarch64'
+endian = 'little'

toolchain/riscv64.cross-file

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+[binaries]
+c = 'clang'
+cpp = 'clang++'
+ar = 'llvm-ar'
+strip = 'llvm-strip'
+objcopy = 'llvm-objcopy'
+ld = 'ld.lld'
+
+[built-in options]
+c_args = ['-target', 'riscv64-unknown-none']
+cpp_args = ['-target', 'riscv64-unknown-none']
+c_link_args = ['--target=riscv64-unknown-linux-gnu', '-fuse-ld=lld']
+cpp_link_args = ['--target=riscv64-unknown-linux-gnu', '-fuse-ld=lld']
+
+[host_machine]
+system = 'linux'
+cpu_family = 'riscv64'
+cpu = 'riscv64'
+endian = 'little'

toolchain/x86_64.cross-file

@@ -0,0 +1,19 @@
+[binaries]
+c = 'clang'
+cpp = 'clang++'
+ar = 'llvm-ar'
+strip = 'llvm-strip'
+objcopy = 'llvm-objcopy'
+ld = 'ld.lld'
+
+[built-in options]
+c_args = ['-target', 'x86_64-unknown-none']
+cpp_args = ['-target', 'x86_64-unknown-none']
+c_link_args = ['--target=x86_64-unknown-linux-gnu', '-fuse-ld=lld']
+cpp_link_args = ['--target=x86_64-unknown-linux-gnu', '-fuse-ld=lld']
+
+[host_machine]
+system = 'linux'
+cpu_family = 'x86_64'
+cpu = 'x86_64'
+endian = 'little'