15         println!("cargo:rerun-if-changed=build/probe.rs");  in main()
20             // features regardless of RUSTC_BOOTSTRAP. No need to rerun build  in main()
27                 // RUSTC_BOOTSTRAP to turn on unstable features. Rerun build  in main()
53             println!("cargo:rustc-cfg=std_backtrace");  in main()
54             println!("cargo:rustc-cfg=error_generic_member_access");  in main()
58             println!("cargo:rerun-if-env-changed=RUSTC_BOOTSTRAP");  in main()
69         // https://blog.rust-lang.org/2021/03/25/Rust-1.51.0.html#stabilized-apis  in main()
70         println!("cargo:rustc-cfg=anyhow_no_ptr_addr_of");  in main()
75         // https://blog.rust-lang.org/2021/05/06/Rust-1.52.0.html#stabilized-apis  in main()
76         println!("cargo:rustc-cfg=anyhow_no_fmt_arguments_as_str");  in main()
79         // https://github.com/rust-lang/rust/issues/71668  in main()
80         println!("cargo:rustc-cfg=anyhow_no_unsafe_op_in_unsafe_fn_lint");  in main()
85         // https://blog.rust-lang.org/2022/11/03/Rust-1.65.0.html#stabilized-apis  in main()
86         println!("cargo:rustc-cfg=std_backtrace");  in main()
90 fn compile_probe(rustc_bootstrap: bool) -> bool {  in compile_probe()
92         // We are running inside rustc bootstrap. This is a highly non-standard  in compile_probe()
95         //     https://github.com/rust-lang/cargo/issues/11138  in compile_probe()
96         //     https://github.com/rust-lang/rust/issues/114839  in compile_probe()
104     let probefile = Path::new("build").join("probe.rs");  in compile_probe()
110         cmd.arg(rustc);  in compile_probe()
121         .arg("--edition=2018")  in compile_probe()
122         .arg("--crate-name=anyhow")  in compile_probe()
123         .arg("--crate-type=lib")  in compile_probe()
124         .arg("--emit=dep-info,metadata")  in compile_probe()
125         .arg("--out-dir")  in compile_probe()
126         .arg(out_dir)  in compile_probe()
127         .arg(probefile);  in compile_probe()
130         cmd.arg("--target").arg(target);  in compile_probe()
136             for arg in rustflags.split('\x1f') {  in compile_probe()
137                 cmd.arg(arg);  in compile_probe()
148 fn rustc_minor_version() -> Option<u32> {  in rustc_minor_version()
150     let output = Command::new(rustc).arg("--version").output().ok()?;  in rustc_minor_version()
159 fn cargo_env_var(key: &str) -> OsString {  in cargo_env_var()
162             "Environment variable ${} is not set during execution of build script",  in cargo_env_var()