Merging upstream version 1.72.1+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 98 insertions, 0 deletions

diff --git a/vendor/eyre/build.rs b/vendor/eyre/build.rs
new file mode 100644
index 000000000..60371ab91
--- /dev/null
+++ b/vendor/eyre/build.rs
@@ -0,0 +1,98 @@
+use std::env;
+use std::fs;
+use std::path::Path;
+use std::process::{Command, ExitStatus};
+use std::str;
+
+// This code exercises the surface area that we expect of the std Backtrace
+// type. If the current toolchain is able to compile it, we go ahead and use
+// backtrace in eyre.
+const BACKTRACE_PROBE: &str = r#"
+    #![feature(backtrace)]
+    #![allow(dead_code)]
+
+    use std::backtrace::{Backtrace, BacktraceStatus};
+    use std::error::Error;
+    use std::fmt::{self, Display};
+
+    #[derive(Debug)]
+    struct E;
+
+    impl Display for E {
+        fn fmt(&self, _formatter: &mut fmt::Formatter) -> fmt::Result {
+            unimplemented!()
+        }
+    }
+
+    impl Error for E {
+        fn backtrace(&self) -> Option<&Backtrace> {
+            let backtrace = Backtrace::capture();
+            match backtrace.status() {
+                BacktraceStatus::Captured | BacktraceStatus::Disabled | _ => {}
+            }
+            unimplemented!()
+        }
+    }
+"#;
+
+const TRACK_CALLER_PROBE: &str = r#"
+    #![allow(dead_code)]
+
+    #[track_caller]
+    fn foo() {
+        let _location = std::panic::Location::caller();
+    }
+"#;
+
+fn main() {
+    match compile_probe(BACKTRACE_PROBE) {
+        Some(status) if status.success() => println!("cargo:rustc-cfg=backtrace"),
+        _ => {}
+    }
+
+    match compile_probe(TRACK_CALLER_PROBE) {
+        Some(status) if status.success() => println!("cargo:rustc-cfg=track_caller"),
+        _ => {}
+    }
+
+    let rustc = match rustc_minor_version() {
+        Some(rustc) => rustc,
+        None => return,
+    };
+
+    if rustc < 52 {
+        println!("cargo:rustc-cfg=eyre_no_fmt_arguments_as_str");
+    }
+
+    if rustc < 58 {
+        println!("cargo:rustc-cfg=eyre_no_fmt_args_capture");
+    }
+}
+
+fn compile_probe(probe: &str) -> Option<ExitStatus> {
+    let rustc = env::var_os("RUSTC")?;
+    let out_dir = env::var_os("OUT_DIR")?;
+    let probefile = Path::new(&out_dir).join("probe.rs");
+    fs::write(&probefile, probe).ok()?;
+    Command::new(rustc)
+        .arg("--edition=2018")
+        .arg("--crate-name=eyre_build")
+        .arg("--crate-type=lib")
+        .arg("--emit=metadata")
+        .arg("--out-dir")
+        .arg(out_dir)
+        .arg(probefile)
+        .status()
+        .ok()
+}
+
+fn rustc_minor_version() -> Option<u32> {
+    let rustc = env::var_os("RUSTC")?;
+    let output = Command::new(rustc).arg("--version").output().ok()?;
+    let version = str::from_utf8(&output.stdout).ok()?;
+    let mut pieces = version.split('.');
+    if pieces.next() != Some("rustc 1") {
+        return None;
+    }
+    pieces.next()?.parse().ok()
+}