resolve warnings in 5.5 tools build, add skeleton readme for integer utilities

Author: stephentyrone

Package.swift

@@ -59,41 +59,39 @@ let package = Package(
     .target(
       name: "_TestSupport",
       dependencies: ["Numerics"],
-      exclude: excludedFilenames
+      exclude: ["CMakeLists.txt"]
     ),
 
     // MARK: - Unit test bundles
     .testTarget(
       name: "ComplexTests",
       dependencies: ["_TestSupport"],
-      exclude: excludedFilenames
+      exclude: ["CMakeLists.txt"]
     ),
 
     .testTarget(
       name: "IntegerUtilitiesTests",
       dependencies: ["IntegerUtilities"],
-      exclude: excludedFilenames
+      exclude: ["CMakeLists.txt"]
     ),
 
     .testTarget(
       name: "RealTests",
       dependencies: ["_TestSupport"],
-      exclude: excludedFilenames
+      exclude: ["CMakeLists.txt"]
     ),
 
     // MARK: - Test executables
     .target(
       name: "ComplexLog",
       dependencies: ["Numerics", "_TestSupport"],
-      path: "Tests/Executable/ComplexLog",
-      exclude: excludedFilenames
+      path: "Tests/Executable/ComplexLog"
     ),
 
     .target(
       name: "ComplexLog1p",
       dependencies: ["Numerics", "_TestSupport"],
-      path: "Tests/Executable/ComplexLog1p",
-      exclude: excludedFilenames
+      path: "Tests/Executable/ComplexLog1p"
     )
   ]
 )

Sources/IntegerUtilities/README.md

@@ -0,0 +1,14 @@
+# Integer Utilities
+
+## Utilities defined for `BinaryInteger`
+
+The following API are defined for all integer types conforming to `BinaryInteger`:
+
+- The `gcd(_:_:)` free function implements the _Greatest Common Divisor_
+  operation.
+
+## Utilities defined for `FixedWidthInteger`
+
+- The `rotated(right:)` and `rotated(left:)` methods implement _bitwise
+  rotation_ for signed and unsigned integer types. The count parameter may
+  be any `BinaryInteger` type.