thread 'main' panicked at 'TranslationUnit::parse', ../src/libcore/option.rs:715

[bbigras]

not sure if related to #249

rustc 1.15.0-nightly (daf8c1dfc 2016-12-05)
libbindgen = "0.1.2"
clang 3.9.0-3
Arch Linux 64-bit

wrapper.hpp

#include <opencv2/core/core.hpp>

build.rs

extern crate libbindgen;

use std::env;
use std::path::PathBuf;

fn main() {
    println!("cargo:rustc-link-lib=opencv_core");

    let bindings = libbindgen::Builder::default()
        .clang_arg("-x=c++")
        .header("wrapper.hpp")
        .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!");
}

$ cargo build
Compiling opencv v0.1.0 (file:///home/bbigras/dev/rust/rs-opencv)
error: failed to run custom build command for opencv v0.1.0 (file:///home/bbigras/dev/rust/rs-opencv)
process didn't exit successfully: /home/bbigras/dev/rust/rs-opencv/target/debug/build/opencv-bf020cc2abd762ca/build-script-build (exit code: 101)
--- stdout
cargo:rustc-link-lib=opencv_core

--- stderr
thread 'main' panicked at 'TranslationUnit::parse', ../src/libcore/option.rs:715
note: Run with RUST_BACKTRACE=1 for a backtrace.

[fitzgen]

@BrunoQC thanks for the bug report!

Would you mind running again with RUST_LOG=libbindgen and RUST_BACKTRACE=1 set? and attaching the output here?

[bbigras]

$ RUST_LOG=libbindgen RUST_BACKTRACE=1 cargo build
   Compiling opencv v0.1.0 (file:///home/bbigras/dev/rust/rs-opencv)
error: failed to run custom build command for `opencv v0.1.0 (file:///home/bbigras/dev/rust/rs-opencv)`
process didn't exit successfully: `/home/bbigras/dev/rust/rs-opencv/target/debug/build/opencv-bf020cc2abd762ca/build-script-build` (exit code: 101)
--- stdout
cargo:rustc-link-lib=opencv_core

--- stderr
thread 'main' panicked at 'TranslationUnit::parse', ../src/libcore/option.rs:715
stack backtrace:
   1:     0x5641cc2cd1ba - std::sys::imp::backtrace::tracing::imp::write::hbea47d9dd19b523c
                        at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/obj/../src/libstd/sys/unix/backtrace/tracing/gcc_s.rs:42
   2:     0x5641cc2d1a9f - std::panicking::default_hook::{{closure}}::h6875a2976258b020
                        at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/obj/../src/libstd/panicking.rs:247
   3:     0x5641cc2d169e - std::panicking::default_hook::h88ffbc5922643264
                        at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/obj/../src/libstd/panicking.rs:263
   4:     0x5641cc2d1ee7 - std::panicking::rust_panic_with_hook::hc790e47d4ecc86cd
                        at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/obj/../src/libstd/panicking.rs:451
   5:     0x5641cc2d1d74 - std::panicking::begin_panic::hc066339e2fdc17d1
                        at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/obj/../src/libstd/panicking.rs:413
   6:     0x5641cc2d1c99 - std::panicking::begin_panic_fmt::h5912b2d2df332044
                        at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/obj/../src/libstd/panicking.rs:397
   7:     0x5641cc2d1c27 - rust_begin_unwind
                        at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/obj/../src/libstd/panicking.rs:373
   8:     0x5641cc30ee3d - core::panicking::panic_fmt::h561c5ee168a3d2cb
                        at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/obj/../src/libcore/panicking.rs:69
   9:     0x5641cc30eead - core::option::expect_failed::h6be288f6c3caa41a
                        at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/obj/../src/libcore/option.rs:715
  10:     0x5641cbd11eb0 - <core::option::Option<T>>::expect::hf442c9df50d2b840
                        at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/obj/../src/libcore/option.rs:293
  11:     0x5641cbe2e538 - libbindgen::ir::context::BindgenContext::new::h0d0e42f902f4e166
                        at /home/bbigras/.cargo/registry/src/jiasu.xzqcsaa.nyc.mn-1ecc6299db9ec823/libbindgen-0.1.2/src/ir/context.rs:134
  12:     0x5641cbe5034c - libbindgen::Bindings::generate::hc9788d9682ec912c
                        at /home/bbigras/.cargo/registry/src/jiasu.xzqcsaa.nyc.mn-1ecc6299db9ec823/libbindgen-0.1.2/src/lib.rs:535
  13:     0x5641cbe4f5f5 - libbindgen::Builder::generate::h0a2dd1c7707752ae
                        at /home/bbigras/.cargo/registry/src/jiasu.xzqcsaa.nyc.mn-1ecc6299db9ec823/libbindgen-0.1.2/src/lib.rs:350
  14:     0x5641cbcd50a3 - build_script_build::main::h95698c9937afe21a
                        at /home/bbigras/dev/rust/rs-opencv/build.rs:9
  15:     0x5641cc2da99a - __rust_maybe_catch_panic
                        at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/obj/../src/libpanic_unwind/lib.rs:97
  16:     0x5641cc2d272a - std::rt::lang_start::h5d71a3afaaa4b2ff
                        at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/obj/../src/libstd/panicking.rs:332
                        at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/obj/../src/libstd/panic.rs:351
                        at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/obj/../src/libstd/rt.rs:57
  17:     0x5641cbcd5292 - main
  18:     0x7f98dc9bc290 - __libc_start_main
  19:     0x5641cbcb7db9 - _start
  20:                0x0 - <unknown>

[emilio]

That happens when the file doesn't exist. Arguably we should be able to provide a better error here. Presumably the file is called wrapper.h and you're invoking bindgen with wrapper.hpp, or viceversa?

[bbigras]

Sorry, my wrapper is called wrapper.hpp. I copy pasted the name from the other bug report.

[bbigras]

I don't have the parse problem if I remove the clang_arg().

[emilio]

Oh, what happens if you do: .clang_arg("-x").clang_arg("c++")? Shouldn't be needed if the wrapper is already an hpp file, but I think that -x=c++ is an invalid argument for clang.

[bbigras]

I don't have the problem with .clang_arg("-x").clang_arg("c++"). Thanks.