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add some comments to clarify command-line argument munging in #482

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Andrew Poelstra 2018-10-16 18:06:24 +00:00
parent 38ed191d28
commit 4fa5bfa2bb
1 changed files with 7 additions and 0 deletions
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7
src/bin/cargo-miri.rs
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@ -99,6 +99,7 @@ fn main() {
); );
match (test, &kind[..]) { match (test, &kind[..]) {
(true, "test") => { (true, "test") => {
// For test binaries we call `cargo rustc --test target -- <rustc args>`
if let Err(code) = process( if let Err(code) = process(
vec!["--test".to_string(), target.name].into_iter().chain( vec!["--test".to_string(), target.name].into_iter().chain(
args, args,
@ -109,6 +110,11 @@ fn main() {
} }
} }
(true, "lib") => { (true, "lib") => {
// For libraries we call `cargo rustc -- --test <rustc args>`
// Notice now that `--test` is a rustc arg rather than a cargo arg. This tells
// rustc to build a test harness which calls all #[test] functions. We don't
// use the harness since we execute each #[test] function's MIR ourselves before
// compilation even completes, but this option is necessary to build the library.
if let Err(code) = process( if let Err(code) = process(
vec!["--".to_string(), "--test".to_string()].into_iter().chain( vec!["--".to_string(), "--test".to_string()].into_iter().chain(
args, args,
@ -119,6 +125,7 @@ fn main() {
} }
} }
(false, "bin") => { (false, "bin") => {
// For ordinary binaries we call `cargo rustc --bin target -- <rustc args>`
if let Err(code) = process( if let Err(code) = process(
vec!["--bin".to_string(), target.name].into_iter().chain( vec!["--bin".to_string(), target.name].into_iter().chain(
args, args,