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Set linker script from build.rs file
This has two advantages: 1. It adds a `cargo:rerun-if-changed` command to ensure we rebuild crates if the linker script changes. 2. The path to the linker script does not depend on the directory that Cargo is executed from, so `cargo build` can be done from anywhere. Signed-off-by: James Wainwright <[email protected]>
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@@ -12,6 +12,7 @@ members = [ | |
"demo/lcd_hal", | ||
"demo/pwm_hal", | ||
] | ||
resolver = "2" | ||
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[profile.release] | ||
debug = true |
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@@ -0,0 +1,42 @@ | ||
// Copyright lowRISC contributors. | ||
// Licensed under the Apache License, Version 2.0, see LICENSE for details. | ||
// SPDX-License-Identifier: Apache-2.0 | ||
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//! This Cargo build script locates and uses the `link.ld` linker script. | ||
//! | ||
//! This build script can be used by a crate from its Cargo.toml: | ||
//! | ||
//! ```toml | ||
//! [package] | ||
//! ... | ||
//! build = "../path/to/build.rs" | ||
//! ``` | ||
//! | ||
//! Build scripts are run with their working directory as the root of the | ||
//! crate being built. We must find the path to the Cargo workspace in order | ||
//! to get the correct path to the `link.ld` script. | ||
use std::path::PathBuf; | ||
use std::process::Command; | ||
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fn main() { | ||
// Ask Cargo for the path of the workspace. | ||
let workspace_path = Command::new(env!("CARGO")) | ||
.arg("locate-project") | ||
.arg("--workspace") | ||
.arg("--message-format=plain") | ||
.output() | ||
.expect("failed to locate project using cargo") | ||
.stdout; | ||
let workspace_path = std::str::from_utf8(&workspace_path).expect("path to workspace not UTF-8"); | ||
let workspace_path = PathBuf::from(workspace_path); | ||
let workspace_path = workspace_path.parent().expect("failed to get parent"); | ||
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// Find the path of the linker script relative to the workspace. | ||
let linker_script_path = workspace_path.join("../common/link.ld"); | ||
let linker_script_path = linker_script_path.display(); | ||
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// Use the linker script and rebuild crates if it changes. | ||
println!("cargo:rerun-if-changed={linker_script_path}"); | ||
println!("cargo:rustc-link-arg=-T{linker_script_path}"); | ||
} |
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