Link the system math library explicitly when building for Android and Linux

Author: stephentyrone

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version:5.0
+// swift-tools-version:5.2
 //===--- Package.swift ----------------------------------------*- swift -*-===//
 //
 // This source file is part of the Swift Numerics open source project
@@ -25,7 +25,13 @@ let package = Package(
     // User-facing modules
     .target(name: "ComplexModule", dependencies: ["RealModule"]),
     .target(name: "Numerics", dependencies: ["ComplexModule", "RealModule"]),
-    .target(name: "RealModule", dependencies: ["_NumericsShims"]),
+    .target(
+      name: "RealModule",
+      dependencies: ["_NumericsShims"],
+      linkerSettings: [
+        .linkedLibrary("m", .when(platforms: [.linux, .android]))
+      ]
+    ),
 
     // Implementation details
     .target(name: "_NumericsShims", dependencies: []),

[email protected]

@@ -0,0 +1,46 @@
+// swift-tools-version:5.0
+//===--- [email protected] ------------------------------*- swift -*-===//
+//
+// This source file is part of the Swift Numerics open source project
+//
+// Copyright (c) 2019 Apple Inc. and the Swift Numerics project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+//
+//===----------------------------------------------------------------------===//
+
+import PackageDescription
+
+let package = Package(
+  
+  name: "swift-numerics",
+  products: [
+    .library(name: "ComplexModule", targets: ["ComplexModule"]),
+    .library(name: "Numerics", targets: ["Numerics"]),
+    .library(name: "RealModule", targets: ["RealModule"]),
+  ],
+  
+  targets: [
+    // User-facing modules
+    .target(name: "ComplexModule", dependencies: ["RealModule"]),
+    .target(name: "Numerics", dependencies: ["ComplexModule", "RealModule"]),
+    .target(
+      name: "RealModule",
+      dependencies: ["_NumericsShims"],
+      linkerSettings: [ .linkedLibrary("m", .when(platforms: [.linux])) ]
+    ),
+    
+    // Implementation details
+    .target(name: "_NumericsShims", dependencies: []),
+    .target(name: "_TestSupport", dependencies: ["Numerics"]),
+    
+    // Unit test bundles
+    .testTarget(name: "ComplexTests", dependencies: ["_TestSupport"]),
+    .testTarget(name: "RealTests", dependencies: ["_TestSupport"]),
+    
+    // Test executables
+    .target(name: "ComplexLog", dependencies: ["Numerics", "_TestSupport"], path: "Tests/Executable/ComplexLog"),
+    .target(name: "ComplexLog1p", dependencies: ["Numerics", "_TestSupport"], path: "Tests/Executable/ComplexLog1p")
+  ]
+)

Sources/_NumericsShims/CMakeLists.txt

@@ -10,5 +10,7 @@ See https://swift.org/LICENSE.txt for license information
 add_library(_NumericsShims INTERFACE)
 target_include_directories(_NumericsShims INTERFACE
   include)
+target_link_libraries(_NumericsShims INTERFACE
+  $<$<PLATFORM_ID:Linux>:m>)
 
 set_property(GLOBAL APPEND PROPERTY SWIFT_NUMERICS_EXPORTS _NumericsShims)