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build.rs
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build.rs
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extern crate shlex;
use std::env;
fn main() {
let cflags = env::var("DEP_RIOT_SYS_CFLAGS")
.expect("DEP_RIOT_SYS_CFLAGS is not set, check whether riot-sys exports it.");
let cflags = shlex::split(&cflags).expect("Odd shell escaping in CFLAGS");
println!("cargo:rerun-if-env-changed=DEP_RIOT_SYS_CFLAGS");
for flag in cflags.iter() {
if flag.starts_with("-DMODULE_") {
// Some modules like cmsis-dsp_StatisticsFunctions have funny characters
println!(
"cargo:rustc-cfg=riot_module_{}",
flag[9..].to_lowercase().replace("-", "_")
);
}
if flag == "-DDEVELHELP" {
println!("cargo:rustc-cfg=riot_develhelp");
}
}
let mut bindgen_output_file = None;
for (key, value) in env::vars() {
if let Some(marker) = key.strip_prefix("DEP_RIOT_SYS_MARKER_") {
println!("cargo:rerun-if-env-changed={}", key);
// It appears that they get uppercased in Cargo -- but should be lower-case as in the
// original riot-sys build.rs, especially to not make the cfg statements look weird.
println!("cargo:rustc-cfg=marker_{}", marker.to_lowercase());
}
if key == "DEP_RIOT_SYS_BINDGEN_OUTPUT_FILE" {
bindgen_output_file = Some(value);
}
}
if let Some(bindgen_output_file) = bindgen_output_file {
let bindgen_output = std::fs::read_to_string(bindgen_output_file)
.expect("Failed to read BINDGEN_OUTPUT_FILE");
const BOOLEAN_FLAGS: &[&str] = &[
// This decides whether or not some fields are populated ... and unlike with other
// structs, the zeroed default is not a good solution here. (It'd kind of work, but
// it'd produce incorrect debug output).
"CONFIG_AUTO_INIT_ENABLE_DEBUG",
];
let parsed = syn::parse_file(&bindgen_output).expect("Failed to parse bindgen output");
for item in &parsed.items {
if let syn::Item::Const(const_) = item {
// It's the easiest way to get something we can `contains`...
let ident = const_.ident.to_string();
if BOOLEAN_FLAGS.contains(&ident.as_str()) {
if let syn::Expr::Lit(syn::ExprLit {
lit: syn::Lit::Int(litint),
..
}) = &*const_.expr
{
let value: usize = litint
.base10_parse()
.expect("Identifier is integer literal but not parsable");
if value != 0 {
println!("cargo:rustc-cfg=marker_{}", ident.to_lowercase());
}
continue;
}
panic!(
"Found {} but it's not the literal const it was expected to be",
ident
);
}
}
}
} else {
println!("cargo:warning=Old riot-sys did not provide BINDGEN_OUTPUT_FILE, assuming it's an old RIOT version");
}
}