diff options
Diffstat (limited to 'src/bootstrap/bin/rustc.rs')
-rw-r--r-- | src/bootstrap/bin/rustc.rs | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/src/bootstrap/bin/rustc.rs b/src/bootstrap/bin/rustc.rs index dd86634b47c..e87125a49a6 100644 --- a/src/bootstrap/bin/rustc.rs +++ b/src/bootstrap/bin/rustc.rs @@ -19,7 +19,7 @@ include!("../dylib_util.rs"); use std::env; use std::path::PathBuf; -use std::process::{Child, Command}; +use std::process::{exit, Child, Command}; use std::str::FromStr; use std::time::Instant; @@ -47,7 +47,12 @@ fn main() { } else { ("RUSTC_REAL", "RUSTC_LIBDIR") }; - let stage = env::var("RUSTC_STAGE").expect("RUSTC_STAGE was not set"); + let stage = env::var("RUSTC_STAGE").unwrap_or_else(|_| { + // Don't panic here; it's reasonable to try and run these shims directly. Give a helpful error instead. + eprintln!("rustc shim: fatal: RUSTC_STAGE was not set"); + eprintln!("rustc shim: note: use `x.py build -vvv` to see all environment variables set by bootstrap"); + exit(101); + }); let sysroot = env::var_os("RUSTC_SYSROOT").expect("RUSTC_SYSROOT was not set"); let on_fail = env::var_os("RUSTC_ON_FAIL").map(Command::new); |