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Hey everyone, I'm struggling a bit getting bindgen to pick up on The files: // wrapper.h
#include "stdio.h" // I have also tried <stdio.h>// build.rs
fn main() {
const HEADER_PATH: &str = "wrapper.h";
println!("cargo:rerun-if-changed={HEADER_PATH}");
let bindings = bindgen::Builder::default()
.header(HEADER_PATH)
.clang_args(["-x", "c", "-std=c11"]) // I have tried with and without that,
.generate()
.expect("Unable to generate bindings");
let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
bindings
.write_to_file(out_path.join("bindings.rs"))
.expect("couldn't write bindings");
}Running either of the below works fine: $ clang wrapper.h
$ bindgen wrapper.hBut running Both Does anyone have any suggestions? |
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Replies: 3 comments 3 replies
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After some chasing down, it seems like it's due to my target. Running clang with |
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I'm having the same problem - but in my case Cargo is failing to build a dependency:
There's no cross-compilation involved, building on MacOS Sonoma for MacOS Sonoma, on Apple Silicon M2. There's no way (that I know of) to pass Please help. |
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Experimenting with |
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Apple Silicon M2 Max, MacOS Sonoma 14.3.1, Xcode-15.2, Rust-1.76.0.
// build.rs
use std::env;
use std::path::PathBuf;
fn main() {
// Tell cargo to look for shared libraries in the specified directory
println!("cargo:rustc-link-search=/opt/local/lib");
// Tell cargo to tell rustc to link the system bzip2
// shared library.
println!("cargo:rustc-link-lib=bz2");
// The bindgen::Builder is the main entry point
// to bindgen, and lets you build up options for
// the resulting bindings.
let bindings = bindgen::Builder::default()
// The input header we would like to generate
// bindings for.
.header("wrapper.h")
// Tell cargo to invalidate the built crate whenever any of the
// included header files changed.
.parse_callbacks(Box::new(bindgen::CargoCallbacks::new()))
// Finish the builder and generate the bindings.
.generate()
// Unwrap the Result and panic on failure.
.expect("Unable to generate bindings");
// Write the bindings to the $OUT_DIR/bindings.rs file.
let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
bindings
.write_to_file(out_path.join("bindings.rs"))
.expect("Couldn't write bindings!");
}// wrapper.h
#include <bzlib.h># Cargo.toml
[package]
name = "bindgen-tst2"
version = "0.1.0"
edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
env = "0.0.0"
[build-dependencies]
bindgen = "0.69.4" |
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UpdateMoving // wrapper.h
#include <stdio.h>
#include <bzlib.h>// build.rs
use std::env;
use std::path::PathBuf;
fn main() {
// Tell cargo to look for shared libraries in the specified directory
println!("cargo:rustc-link-search=/opt/local/lib");
// Tell cargo to tell rustc to link the system bzip2
// shared library.
println!("cargo:rustc-link-lib=bz2");
// The bindgen::Builder is the main entry point
// to bindgen, and lets you build up options for
// the resulting bindings.
let bindings = bindgen::Builder::default()
// The input header we would like to generate
// bindings for.
.header("wrapper.h")
// Tell cargo to invalidate the built crate whenever any of the
// included header files changed.
.parse_callbacks(Box::new(bindgen::CargoCallbacks::new()))
// Finish the builder and generate the bindings.
.generate()
// Unwrap the Result and panic on failure.
.expect("Unable to generate bindings");
// Write the bindings to the $OUT_DIR/bindings.rs file.
let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
bindings
.write_to_file(out_path.join("bindings.rs"))
.expect("Couldn't write bindings!");
}Reproduces the failure: $ bindgen wrapper.h -- -v
clang version 16.0.6
Target: arm64-apple-darwin23.3.0
Thread model: posix
InstalledDir:
ignoring nonexistent directory "lib/clang/16/include"
ignoring nonexistent directory "/usr/include"
ignoring duplicate directory "/usr/local/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/local/include
/opt/local/libexec/llvm-16/lib/clang/16/include
/System/Library/Frameworks
/Library/Frameworks
/System/Library/Frameworks (framework directory)
/Library/Frameworks (framework directory)
End of search list.
wrapper.h:3:10: fatal error: 'stdio.h' file not found
panicked at /Users/ur20980/.cargo/registry/src/index.crates.io-6f17d22bba15001f/bindgen-cli-0.69.4/main.rs:52:36:
Unable to generate bindings: ClangDiagnostic("wrapper.h:3:10: fatal error: 'stdio.h' file not found\n")
$
$ port select clang
Available versions for clang:
apple-clang
mp-clang-16
mp-clang-17 (active)
none
$ Observations:
Update 2I found two workarounds:
I still think |
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This can be configured via: https://github.com/KyleMayes/clang-sys?tab=readme-ov-file#environment-variables. clang-sys also uses the higher version of clang by default. Meaning that they are not being able to find the "right" clang.
This is more of a clang issue in my opinion. Bindgen doesn't try to guess where your system headers are located and just calls clang. It would be more reasonable if clang included such paths instead.
Basically, the same answer as before. Bindgen doesn't look for header files. The only thing bindgen can do is pass extra arguments to clang as you suggested. There are also the |
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After some chasing down, it seems like it's due to my target. Running clang with
-target thumbv7em-none-eabihfgets the same results