Add -v to cc when swift-build is instantiated -vv

Author: mxcl

Sources/Build/describe().swift

@@ -41,7 +41,7 @@ public func describe(prefix: String, _ conf: Configuration, _ modules: [Module],
     }
 
     var mkdirs = Set<String>()
-    let swiftcArgs = Xcc + Xswiftc
+    let swiftcArgs = Xcc + Xswiftc + verbosity.ccArgs
 
     for case let module as SwiftModule in modules {
 

Sources/ManifestParser/Manifest+parse.swift

@@ -64,6 +64,7 @@ private func parse(manifestPath: String) throws -> String? {
     cmd += ["--driver-mode=swift"]
     cmd += ["-I", libdir]
     cmd += ["-L", libdir, "-lPackageDescription"]
+    cmd += verbosity.ccArgs
 #if os(OSX)
     cmd += ["-target", "x86_64-apple-macosx10.10"]
 #endif

Sources/Utility/Verbosity.swift

@@ -23,6 +23,18 @@ public enum Verbosity: Int {
             self = .Debug
         }
     }
+
+    public var ccArgs: [String] {
+        switch self {
+        case .Concise:
+            return []
+        case .Verbose:
+            // the first level of verbosity is passed to llbuild itself
+            return []
+        case .Debug:
+            return ["-v"]
+        }
+    }
 }
 
 public var verbosity = Verbosity.Concise