Always rebuild targets when using cargo-fix

src/cargo/core/compiler/build_config.rs

@@ -16,6 +16,8 @@ pub struct BuildConfig {
     pub mode: CompileMode,
     /// Whether to print std output in json format (for machine reading)
     pub message_format: MessageFormat,
+    /// Force cargo to do a full rebuild and treat each target as changed.
+    pub force_rebuild: bool,
     /// Output a build plan to stdout instead of actually compiling.
     pub build_plan: bool,
     /// Use Cargo itself as the wrapper around rustc, only used for `cargo fix`
@@ -79,6 +81,7 @@ impl BuildConfig {
             release: false,
             mode,
             message_format: MessageFormat::Human,
+            force_rebuild: false,
             build_plan: false,
             cargo_as_rustc_wrapper: false,
             extra_rustc_env: Vec::new(),

src/cargo/core/compiler/mod.rs

@@ -132,6 +132,7 @@ fn compile<'a, 'cfg: 'a>(
 ) -> CargoResult<()> {
     let bcx = cx.bcx;
     let build_plan = bcx.build_config.build_plan;
+    let force_rebuild = bcx.build_config.force_rebuild;
     if !cx.compiled.insert(*unit) {
         return Ok(());
     }
@@ -164,7 +165,7 @@ fn compile<'a, 'cfg: 'a>(
         let dirty = work.then(link_targets(cx, unit, false)?).then(dirty);
         let fresh = link_targets(cx, unit, true)?.then(fresh);
 
-        if exec.force_rebuild(unit) {
+        if exec.force_rebuild(unit) || force_rebuild {
             freshness = Freshness::Dirty;
         }
 

src/cargo/ops/fix.rs

@@ -48,6 +48,8 @@ pub fn fix(ws: &Workspace, opts: &mut FixOptions) -> CargoResult<()> {
     ));
     let _started = lock_server.start()?;
 
+    opts.compile_opts.build_config.force_rebuild = true;
+
     if opts.broken_code {
         let key = BROKEN_CODE_ENV.to_string();
         opts.compile_opts.build_config.extra_rustc_env.push((key, "1".to_string()));

tests/testsuite/fix.rs

@@ -950,3 +950,94 @@ For more information try --help
         .with_stderr(stderr)
         .run();
 }
+
+#[test]
+fn shows_warnings_on_second_run_without_changes() {
+    let p = project()
+        .file(
+            "src/lib.rs",
+            r#"
+                use std::default::Default;
+
+                pub fn foo() {
+                }
+            "#,
+        )
+        .build();
+
+    p.cargo("fix --allow-no-vcs")
+        .with_stderr_contains("[..]warning: unused import[..]")
+        .run();
+
+    p.cargo("fix --allow-no-vcs")
+        .with_stderr_contains("[..]warning: unused import[..]")
+        .run();
+}
+
+#[test]
+fn shows_warnings_on_second_run_without_changes_on_multiple_targets() {
+    let p = project()
+        .file(
+            "src/lib.rs",
+            r#"
+                use std::default::Default;
+
+                pub fn a() -> u32 { 3 }
+            "#,
+        )
+        .file(
+            "src/main.rs",
+            r#"
+                use std::default::Default;
+                fn main() { println!("3"); }
+            "#,
+        )
+        .file(
+            "tests/foo.rs",
+            r#"
+                use std::default::Default;
+                #[test]
+                fn foo_test() {
+                    println!("3");
+                }
+            "#,
+        )
+        .file(
+            "tests/bar.rs",
+            r#"
+                use std::default::Default;
+
+                #[test]
+                fn foo_test() {
+                    println!("3");
+                }
+            "#,
+        )
+        .file(
+            "examples/fooxample.rs",
+            r#"
+                use std::default::Default;
+
+                fn main() {
+                    println!("3");
+                }
+            "#,
+        )
+        .build();
+
+    p.cargo("fix --allow-no-vcs --all-targets")
+        .with_stderr_contains(" --> examples/fooxample.rs:2:21")
+        .with_stderr_contains(" --> src/lib.rs:2:21")
+        .with_stderr_contains(" --> src/main.rs:2:21")
+        .with_stderr_contains(" --> tests/bar.rs:2:21")
+        .with_stderr_contains(" --> tests/foo.rs:2:21")
+        .run();
+
+    p.cargo("fix --allow-no-vcs --all-targets")
+        .with_stderr_contains(" --> examples/fooxample.rs:2:21")
+        .with_stderr_contains(" --> src/lib.rs:2:21")
+        .with_stderr_contains(" --> src/main.rs:2:21")
+        .with_stderr_contains(" --> tests/bar.rs:2:21")
+        .with_stderr_contains(" --> tests/foo.rs:2:21")
+        .run();
+}