Adding Undefined Behavior Sanitizer support for C Family Languages

Author: rahul-malik

Fixtures/CFamilyTargets/CUBSan/Package.swift

@@ -0,0 +1,13 @@
+// swift-tools-version:4.2
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "CUBSan",
+    targets: [
+        .target(
+            name: "CUBSan",
+            path: "./")
+    ]
+)

Fixtures/CFamilyTargets/CUBSan/README.md

@@ -0,0 +1,3 @@
+# CUBSan
+
+A description of this package.

Fixtures/CFamilyTargets/CUBSan/include/main.h

@@ -0,0 +1 @@
+int main(int argc, char **argv);

Fixtures/CFamilyTargets/CUBSan/main.m

@@ -0,0 +1,5 @@
+int main(int argc, char **argv) {
+  int k = 0x7fffffff;
+  k += argc;
+  return 0;
+}

Sources/Build/Sanitizers.swift

@@ -15,12 +15,14 @@ import Utility
 public enum Sanitizer: String {
     case address
     case thread
+    case undefined
 
     /// Return an established short name for a sanitizer, e.g. "asan".
     public var shortName: String {
         switch self {
             case .address: return "asan"
             case .thread: return "tsan"
+            case .undefined: return "ubsan"
         }
     }
 }
@@ -61,5 +63,6 @@ extension Sanitizer: StringEnumArgument {
     public static let completion: ShellCompletion = .values([
         (address.rawValue, "enable Address sanitizer"),
         (thread.rawValue, "enable Thread sanitizer"),
+        (undefined.rawValue, "enable Undefined Behavior sanitizer")
     ])
 }