Only force rebuild of top-level units, not of unit dependencies

Author: dwijnand

src/cargo/core/compiler/context/mod.rs

@@ -157,7 +157,8 @@ impl<'a, 'cfg> Context<'a, 'cfg> {
             // part of this, that's all done next as part of the `execute`
             // function which will run everything in order with proper
             // parallelism.
-            super::compile(&mut self, &mut queue, &mut plan, unit, exec)?;
+            let force_rebuild = self.bcx.build_config.force_rebuild;
+            super::compile(&mut self, &mut queue, &mut plan, unit, exec, force_rebuild)?;
         }
 
         // Now that we've figured out everything that we're going to do, do it!

src/cargo/core/compiler/mod.rs

@@ -129,10 +129,10 @@ fn compile<'a, 'cfg: 'a>(
     plan: &mut BuildPlan,
     unit: &Unit<'a>,
     exec: &Arc<Executor>,
+    force_rebuild: bool,
 ) -> 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(());
     }
@@ -176,7 +176,7 @@ fn compile<'a, 'cfg: 'a>(
 
     // Be sure to compile all dependencies of this target as well.
     for unit in cx.dep_targets(unit).iter() {
-        compile(cx, jobs, plan, unit, exec)?;
+        compile(cx, jobs, plan, unit, exec, false)?;
     }
     if build_plan {
         plan.add(cx, unit)?;