]> git.lizzy.rs Git - rust.git/blob - src/bin/cg_clif_build_sysroot.rs
Merge commit 'dbee13661efa269cb4cd57bb4c6b99a19732b484' into sync_cg_clif-2020-12-27
[rust.git] / src / bin / cg_clif_build_sysroot.rs
1 //! The only difference between this and cg_clif.rs is that this binary defaults to using cg_llvm
2 //! instead of cg_clif and requires `--clif` to use cg_clif and that this binary doesn't have JIT
3 //! support.
4 //! This is necessary as with Cargo `RUSTC` applies to both target crates and host crates. The host
5 //! crates must be built with cg_llvm as we are currently building a sysroot for cg_clif.
6 //! `RUSTFLAGS` however is only applied to target crates, so `--clif` would only be passed to the
7 //! target crates.
8
9 #![feature(rustc_private)]
10
11 extern crate rustc_data_structures;
12 extern crate rustc_driver;
13 extern crate rustc_interface;
14 extern crate rustc_session;
15 extern crate rustc_target;
16
17 use std::path::PathBuf;
18
19 use rustc_interface::interface;
20 use rustc_session::config::ErrorOutputType;
21 use rustc_session::early_error;
22 use rustc_target::spec::PanicStrategy;
23
24 fn find_sysroot() -> String {
25     // Taken from https://github.com/Manishearth/rust-clippy/pull/911.
26     let home = option_env!("RUSTUP_HOME").or(option_env!("MULTIRUST_HOME"));
27     let toolchain = option_env!("RUSTUP_TOOLCHAIN").or(option_env!("MULTIRUST_TOOLCHAIN"));
28     match (home, toolchain) {
29         (Some(home), Some(toolchain)) => format!("{}/toolchains/{}", home, toolchain),
30         _ => option_env!("RUST_SYSROOT")
31             .expect("need to specify RUST_SYSROOT env var or use rustup or multirust")
32             .to_owned(),
33     }
34 }
35
36 pub struct CraneliftPassesCallbacks {
37     use_clif: bool,
38 }
39
40 impl rustc_driver::Callbacks for CraneliftPassesCallbacks {
41     fn config(&mut self, config: &mut interface::Config) {
42         if !self.use_clif {
43             config.opts.maybe_sysroot = Some(PathBuf::from(find_sysroot()));
44             return;
45         }
46
47         config.opts.cg.panic = Some(PanicStrategy::Abort);
48         config.opts.debugging_opts.panic_abort_tests = true;
49         config.opts.maybe_sysroot = Some(
50             std::env::current_exe()
51                 .unwrap()
52                 .parent()
53                 .unwrap()
54                 .parent()
55                 .unwrap()
56                 .parent()
57                 .unwrap()
58                 .join("build_sysroot")
59                 .join("sysroot"),
60         );
61     }
62 }
63
64 fn main() {
65     rustc_driver::init_rustc_env_logger();
66     rustc_driver::install_ice_hook();
67     let exit_code = rustc_driver::catch_with_exit_code(|| {
68         let mut use_clif = false;
69
70         let args = std::env::args_os()
71             .enumerate()
72             .map(|(i, arg)| {
73                 arg.into_string().unwrap_or_else(|arg| {
74                     early_error(
75                         ErrorOutputType::default(),
76                         &format!("Argument {} is not valid Unicode: {:?}", i, arg),
77                     )
78                 })
79             })
80             .filter(|arg| {
81                 if arg == "--clif" {
82                     use_clif = true;
83                     false
84                 } else {
85                     true
86                 }
87             })
88             .collect::<Vec<_>>();
89
90         let mut callbacks = CraneliftPassesCallbacks { use_clif };
91
92         let mut run_compiler = rustc_driver::RunCompiler::new(&args, &mut callbacks);
93         if use_clif {
94             run_compiler.set_make_codegen_backend(Some(Box::new(move |_| {
95                 Box::new(rustc_codegen_cranelift::CraneliftCodegenBackend { config: None })
96             })));
97         }
98         run_compiler.run()
99     });
100     std::process::exit(exit_code)
101 }