fix

David Ungar · David Ungar · commit 934f60f41158 · 2021-02-13T23:13:23.000-08:00
diff --git a/Sources/SwiftDriver/IncrementalCompilation/InitialStateComputer.swift b/Sources/SwiftDriver/IncrementalCompilation/InitialStateComputer.swift
@@ -162,6 +162,9 @@ extension IncrementalCompilationState.InitialStateComputer {
   {
     let graph = ModuleDependencyGraph(self)
     assert(outputFileMap.onlySourceFilesHaveSwiftDeps())
+    guard graph.populateInputDependencySourceMap() else {
+      return nil
+    }
 
     // Every external will be an addition to the graph, but may not cause
     // a recompile, so includeAddedExternals is false.

Original file line number	Diff line number	Diff line change
`@@ -162,6 +162,9 @@ extension IncrementalCompilationState.InitialStateComputer {`
`162`	`162`	`{`
`163`	`163`	`let graph = ModuleDependencyGraph(self)`
`164`	`164`	`assert(outputFileMap.onlySourceFilesHaveSwiftDeps())`
	`165`	`+ guard graph.populateInputDependencySourceMap() else {`
	`166`	`+ return nil`
	`167`	`+ }`
`165`	`168`
`166`	`169`	`// Every external will be an addition to the graph, but may not cause`
`167`	`170`	`// a recompile, so includeAddedExternals is false.`