print the delta

David Ungar · David Ungar · commit 365cbfa89e1a · 2021-07-15T11:00:43.000-07:00
diff --git a/Sources/SwiftDriver/IncrementalCompilation/IncrementalDependencyAndInputSetup.swift b/Sources/SwiftDriver/IncrementalCompilation/IncrementalDependencyAndInputSetup.swift
@@ -226,7 +226,7 @@ extension IncrementalCompilationState.IncrementalDependencyAndInputSetup {
     catch let ModuleDependencyGraph.ReadError.timeTravellingPriors(priorsModTime: priorsModTime, buildRecordModTime: buildRecordModTime) {
       diagnosticEngine.emit(
         warning: "Will not do cross-module incremental builds, priors saved at \(priorsModTime)), " +
-        "but the previous build started at \(buildRecordModTime), at '\(dependencyGraphPath)'")
+        "but the previous build started at \(buildRecordModTime) [delta: \(priorsModTime.timeIntervalSince(buildRecordModTime))], at '\(dependencyGraphPath)'")
       graphIfPresent = nil
     }
     catch {

Original file line number	Diff line number	Diff line change
`@@ -226,7 +226,7 @@ extension IncrementalCompilationState.IncrementalDependencyAndInputSetup {`
`226`	`226`	`catch let ModuleDependencyGraph.ReadError.timeTravellingPriors(priorsModTime: priorsModTime, buildRecordModTime: buildRecordModTime) {`
`227`	`227`	`diagnosticEngine.emit(`
`228`	`228`	`warning: "Will not do cross-module incremental builds, priors saved at \(priorsModTime)), " +`
`229`		`- "but the previous build started at \(buildRecordModTime), at '\(dependencyGraphPath)'")`
	`229`	`+ "but the previous build started at \(buildRecordModTime) [delta: \(priorsModTime.timeIntervalSince(buildRecordModTime))], at '\(dependencyGraphPath)'")`
`230`	`230`	`graphIfPresent = nil`
`231`	`231`	`}`
`232`	`232`	`catch {`