44127a8185
The U-Boot library can be used from Rust fairly easily. Add an example for this, following along the lines of the existing ulib example. Note that the new way of representing C strings is not used for now, since it is not available in v1.75 of cargo, as shipped by Ubuntu 24.04 Co-developed-by: Claude <noreply@anthropic.com> Co-developed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Simon Glass <sjg@chromium.org>
106 lines
4.1 KiB
Rust
106 lines
4.1 KiB
Rust
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Build script for U-Boot Rust demo
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*
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* This configures linking with the U-Boot library, similar to how
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* the C examples are built in examples/ulib
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*
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* Copyright 2025 Canonical Ltd.
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* Written by Simon Glass <simon.glass@canonical.com>
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*/
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use std::env;
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use std::path::PathBuf;
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use std::process::Command;
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fn main() {
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// Get the U-Boot build directory from environment or use default
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let uboot_build = env::var("UBOOT_BUILD")
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.unwrap_or_else(|_| "/tmp/b/sandbox".to_string());
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let uboot_build_path = PathBuf::from(&uboot_build);
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println!("cargo:rerun-if-env-changed=UBOOT_BUILD");
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println!("cargo:rerun-if-changed=build.rs");
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// Add library search path
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println!("cargo:rustc-link-search=native={}", uboot_build_path.display());
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// Check if dynamic linking is requested
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if env::var("UBOOT_DYNAMIC").is_ok() {
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// Dynamic linking with libu-boot.so
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println!("cargo:rustc-link-lib=dylib=u-boot");
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println!("cargo:rustc-link-arg=-Wl,-rpath,{}", uboot_build_path.display());
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} else {
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// Static linking with libu-boot.a using whole-archive to ensure
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// all symbols are included (required for U-Boot linker lists)
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// Use the same linker script as the C examples for proper linker list ordering
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let static_lib_path = uboot_build_path.join("libu-boot.a");
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// Use absolute path to the linker script in the source tree
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let current_dir = env::current_dir().expect("Failed to get current directory");
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let linker_script_path = current_dir.join("../ulib/static.lds");
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println!("cargo:rustc-link-arg=-Wl,-T,{}", linker_script_path.display());
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println!("cargo:rustc-link-arg=-Wl,--whole-archive");
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println!("cargo:rustc-link-arg={}", static_lib_path.display());
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println!("cargo:rustc-link-arg=-Wl,--no-whole-archive");
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println!("cargo:rustc-link-arg=-Wl,-z,noexecstack");
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// Add required system libraries AFTER --no-whole-archive like the C version
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println!("cargo:rustc-link-arg=-lpthread");
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println!("cargo:rustc-link-arg=-ldl");
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// Get SDL libraries using sdl2-config like the C version does
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if let Ok(output) = Command::new("sdl2-config").arg("--libs").output() {
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if output.status.success() {
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let libs_str = String::from_utf8_lossy(&output.stdout);
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for lib_flag in libs_str.split_whitespace() {
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if lib_flag.starts_with("-l") {
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println!("cargo:rustc-link-arg={}", lib_flag);
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}
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}
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}
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} else {
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// Fallback to just SDL2 if sdl2-config is not available
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println!("cargo:rustc-link-arg=-lSDL2");
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}
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}
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// For dynamic linking, link required system libraries normally
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if env::var("UBOOT_DYNAMIC").is_ok() {
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println!("cargo:rustc-link-lib=pthread");
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println!("cargo:rustc-link-lib=dl");
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println!("cargo:rustc-link-lib=rt");
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}
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// Optional SDL2 support (if available) - only for dynamic linking
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if env::var("UBOOT_DYNAMIC").is_ok() {
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if let Ok(sdl_libs) = env::var("SDL_LIBS") {
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for lib in sdl_libs.split_whitespace() {
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if let Some(lib_name) = lib.strip_prefix("-l") {
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println!("cargo:rustc-link-lib={}", lib_name);
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}
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}
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}
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}
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// Define symbols that may be missing (from U-Boot troubleshooting docs)
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// Note: __stack_chk_guard is provided by U-Boot's common/stackprot.c
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println!("cargo:rustc-link-arg=-Wl,--defsym,sandbox_sdl_sync=0");
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// For static linking, we need to ensure libc is available for atexit and other functions
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if env::var("UBOOT_DYNAMIC").is_err() {
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println!("cargo:rustc-link-arg=-lc");
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}
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// Add include path for headers if needed for bindgen (future enhancement)
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let uboot_include = uboot_build_path.join("include");
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if uboot_include.exists() {
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println!("cargo:include={}", uboot_include.display());
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}
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// Recompile if main source changes
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println!("cargo:rerun-if-changed=src/demo.rs");
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}
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