#ifdef differentiation benchmarks so they only exist when differentiation is enabled

Author: Marc Rasi

benchmark/single-source/Differentiation.swift

@@ -10,8 +10,9 @@
 //
 //===----------------------------------------------------------------------===//
 
-import TestsUtils
+#if canImport(_Differentiation)
 
+import TestsUtils
 import _Differentiation
 
 public let Differentiation = [
@@ -68,3 +69,5 @@ public func run_DifferentiationArraySum(N: Int) {
     blackHole(valueWithGradient(at: onesArray, in: sum))
   }
 }
+
+#endif

benchmark/utils/main.swift

@@ -69,7 +69,9 @@ import DictionaryOfAnyHashableStrings
 import DictionaryRemove
 import DictionarySubscriptDefault
 import DictionarySwap
+#if canImport(_Differentiation)
 import Differentiation
+#endif
 import Diffing
 import DiffingMyers
 import DropFirst
@@ -259,7 +261,9 @@ registerBenchmark(DictionaryOfAnyHashableStrings)
 registerBenchmark(DictionaryRemove)
 registerBenchmark(DictionarySubscriptDefault)
 registerBenchmark(DictionarySwap)
+#if canImport(_Differentiation)
 registerBenchmark(Differentiation)
+#endif
 registerBenchmark(Diffing)
 registerBenchmark(DiffingMyers)
 registerBenchmark(DropFirst)