examples: New app to build Rust with Cargo

examples/hello_rust_cargo/CMakeLists.txt

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+# ##############################################################################
+# apps/examples/hello_rust_cargo/CMakeLists.txt
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more contributor
+# license agreements.  See the NOTICE file distributed with this work for
+# additional information regarding copyright ownership.  The ASF licenses this
+# file to you under the Apache License, Version 2.0 (the "License"); you may not
+# use this file except in compliance with the License.  You may obtain a copy of
+# the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations under
+# the License.
+#
+# ##############################################################################
+
+include(nuttx_add_library)
+
+if(CONFIG_EXAMPLES_HELLO_RUST_CARGO)
+
+  # Call cargo build from CMakeLists and add it to the build system. Notice we
+  # should call cargo build with add_custom_target, otherwise cargo will be
+  # called every time when cmake is configured.
+
+  add_custom_command(
+    OUTPUT
+      ${CMAKE_BINARY_DIR}/hello_rust_cargo/riscv32imac-unknown-nuttx-elf/release/libhello.a
+    COMMAND
+      cargo build --release -Zbuild-std=core --manifest-path
+      ${CMAKE_CURRENT_SOURCE_DIR}/hello/Cargo.toml --target
+      riscv32imac-unknown-nuttx-elf --target-dir
+      ${CMAKE_BINARY_DIR}/hello_rust_cargo)
+
+  add_custom_target(
+    hello_rust_cargo
+    DEPENDS
+      ${CMAKE_BINARY_DIR}/hello_rust_cargo/riscv32imac-unknown-nuttx-elf/release/libhello.a
+  )
+
+  # Call cargo_build target each time when cmake is configured or generated.
+
+  # Add static library to the build system.
+  nuttx_library_import(
+    rust_hello
+    ${CMAKE_BINARY_DIR}/hello_rust_cargo/riscv32imac-unknown-nuttx-elf/release/libhello.a
+  )
+  nuttx_add_extra_library(rust_hello)
+
+  nuttx_add_application(
+    NAME
+    ${CONFIG_EXAMPLES_HELLO_RUST_CARGO_PROGNAME}
+    SRCS
+    proxy_main.c
+    STACKSIZE
+    ${CONFIG_EXAMPLES_HELLO_STACKSIZE}
+    PRIORITY
+    ${CONFIG_EXAMPLES_HELLO_PRIORITY})
+
+endif() # CONFIG_EXAMPLES_HELLO_RUST_CARGO

examples/hello_rust_cargo/Kconfig

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+#
+# For a description of the syntax of this configuration file,
+# see the file kconfig-language.txt in the NuttX tools repository.
+#
+
+config EXAMPLES_HELLO_RUST_CARGO
+	tristate "\"Hello, Rust!\" example with Cargo"
+	default n
+	---help---
+		Enable the \"Hello, Rust!\" example using Cargo to build.
+
+if EXAMPLES_HELLO_RUST_CARGO
+
+config EXAMPLES_HELLO_RUST_CARGO_PROGNAME
+	string "Program name"
+	default "hello_rust_cargo"
+	---help---
+		This is the name of the program that will be used when the
+		program is installed.
+
+config EXAMPLES_HELLO_RUST_CARGO_PRIORITY
+	int "Hello Rust task priority"
+	default 100
+
+config EXAMPLES_HELLO_RUST_CARGO_STACKSIZE
+	int "Hello Rust stack size"
+	default DEFAULT_TASK_STACKSIZE
+
+endif

examples/hello_rust_cargo/Make.defs

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+############################################################################
+# apps/examples/hello_rust_cargo/Make.defs
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.  The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+ifneq ($(CONFIG_EXAMPLES_HELLO_RUST_CARGO),)
+CONFIGURED_APPS += $(APPDIR)/examples/hello_rust_cargo
+endif

examples/hello_rust_cargo/Makefile

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+############################################################################
+# apps/examples/hello_rust/Makefile
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.  The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+include $(APPDIR)/Make.defs
+
+# Hello, Rust! built-in application info
+
+PROGNAME  = $(CONFIG_EXAMPLES_HELLO_RUST_CARGO_PROGNAME)
+PRIORITY  = $(CONFIG_EXAMPLES_HELLO_RUST_CARGO_PRIORITY)
+STACKSIZE = $(CONFIG_EXAMPLES_HELLO_RUST_CARGO_STACKSIZE)
+MODULE    = $(CONFIG_EXAMPLES_HELLO_RUST_CARGO)
+
+# Do not suppport building this application from Makefile.
+
+include $(APPDIR)/Application.mk

examples/hello_rust_cargo/hello/.gitignore

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+target

examples/hello_rust_cargo/hello/Cargo.toml

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+[package]
+name = "hello"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+crate-type = ["staticlib"]
+
+[profile.dev]
+panic = "abort"
+
+# Special hanlding for the panic! macro, can be removed once
+# the libstd port for NuttX is complete.
+[profile.release]
+panic = "abort"
+lto = true

examples/hello_rust_cargo/hello/src/lib.rs

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+
+// Function hello_rust_cargo without manglng
+#[no_mangle]
+pub extern "C" fn rust_main() {
+    // Print hello world to stdout
+   println!("Hello, world! from Rust and Cargo!");
+}

examples/hello_rust_cargo/proxy_main.c

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+/****************************************************************************
+ * apps/examples/hello_rust_cargo/proxy_main.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <stdio.h>
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+extern void rust_main(void);
+
+/****************************************************************************
+ * main
+ ****************************************************************************/
+
+int main(int argc, FAR char *argv[])
+{
+  rust_main();
+  return 0;
+}