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fix running a Miri that was built in bootstrap

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This commit is contained in:
Ralf Jung 2019-06-14 12:09:43 +02:00
parent ac2f6cbcde
commit 34b0922cec
1 changed files with 23 additions and 15 deletions
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38
src/bin/miri.rs
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@ -102,21 +102,26 @@ fn init_late_loggers() {
/// Returns the "default sysroot" that Miri will use if no `--sysroot` flag is set.
/// Should be a compile-time constant.
fn compile_time_sysroot() -> String {
fn compile_time_sysroot() -> Option<String> {
if option_env!("RUSTC_STAGE").is_some() {
// This is being built as part of rustc, and gets shipped with rustup.
// We can rely on the sysroot computation in librustc.
return None;
}
// For builds outside rustc, we need to ensure that we got a sysroot
// that gets used as a default. The sysroot computation in librustc would
// end up somewhere in the build dir.
// Taken from PR <https://github.com/Manishearth/rust-clippy/pull/911>.
let home = option_env!("RUSTUP_HOME").or(option_env!("MULTIRUST_HOME"));
let toolchain = option_env!("RUSTUP_TOOLCHAIN").or(option_env!("MULTIRUST_TOOLCHAIN"));
match (home, toolchain) {
Some(match (home, toolchain) {
(Some(home), Some(toolchain)) => format!("{}/toolchains/{}", home, toolchain),
_ => {
option_env!("RUST_SYSROOT")
.expect(
"could not find sysroot. Either set `MIRI_SYSROOT` at run-time, or at \
build-time specify `RUST_SYSROOT` env var or use rustup or multirust",
)
.expect("To build Miri without rustup, set the `RUST_SYSROOT` env var at build time")
.to_owned()
}
}
})
}
fn main() {
@ -165,14 +170,17 @@ fn main() {
}
}
// Determine sysroot.
let sysroot_flag = "--sysroot".to_string();
if !rustc_args.contains(&sysroot_flag) {
// We need to *always* set a --sysroot, as the "default" rustc uses is
// somewhere in the directory miri was built in.
// If no --sysroot is given, fall back to env vars that are read at *compile-time*.
rustc_args.push(sysroot_flag);
rustc_args.push(compile_time_sysroot());
// Determine sysroot if needed. Make sure we always call `compile_time_sysroot`
// as that also does some sanity-checks of the environment we were built in.
// FIXME: Ideally we'd turn a bad build env into a compile-time error, but
// CTFE does not seem powerful enough for that yet.
if let Some(sysroot) = compile_time_sysroot() {
let sysroot_flag = "--sysroot".to_string();
if !rustc_args.contains(&sysroot_flag) {
// We need to overwrite the default that librustc would compute.
rustc_args.push(sysroot_flag);
rustc_args.push(sysroot);
}
}
// Finally, add the default flags all the way in the beginning, but after the binary name.