ICE on unwrap on windows

[GuillaumeGomez]

Here is the full output:

D:\process-viewer> cargo build
   Compiling process_viewer v0.0.4 (file:///D:/process-viewer)
error: internal compiler error: unexpected panic

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports

note: run with 'RUST_BACKTRACE=1' for a backtrace

thread 'rustc' panicked at 'called 'Result::unwrap()' on an 'Err' value: JoinPathsError { inner: JoinPathsError }', C:\bot\slave\nightly-dist-rustc-win-gnu-64\build\src\libcore\result.rs:845
stack backtrace:
   0:         0x6eab09f2 - <unknown>
   1:         0x6eab01d1 - <unknown>
   2:         0x6eab1bba - <unknown>
   3:         0x6eab1a56 - <unknown>
   4:         0x6eab1979 - <unknown>
   5:         0x6eab18fb - <unknown>
   6:         0x6eac1a55 - <unknown>
   7:         0x6cf0d86f - <unknown>
   8:         0x6cfc95e5 - <unknown>
   9:         0x6cfbfbd3 - <unknown>
  10:         0x6cfb7806 - <unknown>
  11:         0x6d006e56 - <unknown>
  12:         0x6cf0ae35 - <unknown>
  13:         0x6eab4fb8 - <unknown>
  14:         0x6cf29054 - <unknown>
  15:         0x6eaae482 - <unknown>
  16:     0x7ffa36618363 - <unknown>

error: Could not compile 'process_viewer'.

To learn more, run the command again with --verbose.

I'm running on windows with the following version:

D:\process-viewer>rustc --version
rustc 1.16.0-nightly (4ecc85beb 2016-12-28)

And here is the "problematic" code:

#[cfg(target_os = "windows")]
extern crate pkg_config;

#[cfg(target_os = "windows")]
fn main() {
    use std::env;
    let libs_to_find = ["glib-2.0", "gobject-2.0", "pango-1.0", "gio-2.0", "atk-1.0",
                        "gdk-pixbuf-2.0", "cairo", "gdk-3", "gtk-3"];
    if let Ok(lib_dir) = env::var("GTK_LIB_DIR") {
        for lib_ in libs_to_find.iter() {
            println!("cargo:rustc-link-lib=dylib={}", lib_);
        }
        println!("cargo:rustc-link-search=native={}", lib_dir);
    } else {
        for lib in libs_to_find.iter() {
            pkg_config::probe_library(lib).unwrap();
        }
    }
}

#[cfg(not(target_os = "windows"))]
fn main() {}

I have put the problematic branch/PR here.

[ollie27]

What's the value of the PATH and GTK_LIB_DIR environment variables? They need to not contain any "s.

[ollie27]

rustc -L """ hello.rs produces what might be the same crash on x86_64-pc-windows-msvc rustc 1.16.0-nightly (47c8d9fdc 2017-01-08):

error: internal compiler error: unexpected panic

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports

note: run with `RUST_BACKTRACE=1` for a backtrace

thread 'rustc' panicked at 'called `Result::unwrap()` on an `Err` value: JoinPathsError { inner: JoinPathsError }', C:\bot\slave\nightly-dist-rustc-win-msvc-64\build\src\libcore\result.rs:845
stack backtrace:
   0:     0x7ffea9fdfe70 - std::panicking::Location::line::h8c528bbdf4eef8a3
   1:     0x7ffea9fdf2f2 - std::panicking::Location::line::h8c528bbdf4eef8a3
   2:     0x7ffea9fe2d3d - std::panicking::rust_panic_with_hook::h7abc6e334345e341
   3:     0x7ffea9fe2b88 - std::panicking::begin_panic_fmt::h661e01bdd0e9618c
   4:     0x7ffea9fe2af4 - std::panicking::begin_panic_fmt::h661e01bdd0e9618c
   5:     0x7ffea9fe2a89 - rust_begin_unwind
   6:     0x7ffea9ff3d87 - core::panicking::panic_fmt::hf3abcb5bc11ff49d
   7:     0x7ffeaa240bd6 - <unknown>
   8:     0x7ffeaa32752c - rustc_driver::driver::count_nodes::h761a1dba824a4f1e
   9:     0x7ffeaa31b822 - rustc_driver::driver::count_nodes::h761a1dba824a4f1e
  10:     0x7ffeaa30f4b5 - rustc_driver::driver::compile_input::h44e43be0fc34a1a1
  11:     0x7ffeaa3658a7 - rustc_driver::run_compiler::h5e34a930c0929e5c
  12:     0x7ffeaa23e1ce - <unknown>
  13:     0x7ffea9fe5e01 - _rust_maybe_catch_panic
  14:     0x7ffeaa26c836 - <unknown>
  15:     0x7ffea9fdd33e - std::sys::imp::thread::Thread::new::h7a1b2b1b6bab390a
  16:     0x7ffede858363 - BaseThreadInitThunk

edit: This is probably a dupe of #23667 and/or #32891.

[GuillaumeGomez]

There is not supposed to have any but I can't confirm it right now.

[GuillaumeGomez]

@ollie27: I'm working on it.