Xcode: Add support of Swift Package Manager

Made by Johennes at https://github.com/matrix-org/olm/issues/51#issuecomment-809128833

Package.swift

@@ -0,0 +1,52 @@
+// swift-tools-version:5.3
+
+import PackageDescription
+
+let major = 3, minor = 2, patch = 2
+
+let package = Package(
+    name: "Olm",
+    platforms: [.iOS(.v8), .macOS(.v10_10)],
+    products: [
+        .library(name: "libolm", targets: ["libolm"]),
+        .library(name: "OLMKit", targets: ["OLMKit"])
+    ],
+    targets: [
+        .target(
+            name: "libolm",
+            path: ".",
+            sources: [
+                "src",
+                "lib/crypto-algorithms/aes.c",
+                "lib/crypto-algorithms/sha256.c",
+                "lib/curve25519-donna/curve25519-donna.c"
+            ],
+            cSettings: [
+                .headerSearchPath("lib"),
+                .define("OLMLIB_VERSION_MAJOR", to: "\(major)"),
+                .define("OLMLIB_VERSION_MINOR", to: "\(minor)"),
+                .define("OLMLIB_VERSION_PATCH", to: "\(patch)")
+            ]
+        ),
+        .target(
+            name: "OLMKit",
+            dependencies: ["libolm"],
+            path: "xcode/OLMKit",
+            exclude: ["Info.plist"],
+            cSettings: [
+                .headerSearchPath("..")
+            ]
+        ),
+        .testTarget(
+            name: "OLMKitTests",
+            dependencies: ["OLMKit"],
+            path: "xcode/OLMKitTests",
+            exclude: ["Info.plist"],
+            cSettings: [
+                .headerSearchPath("..")
+            ]
+        )
+    ],
+    cLanguageStandard: .c99,
+    cxxLanguageStandard: .cxx11
+)

include/module.modulemap

@@ -0,0 +1,4 @@
+module libolm {
+    header "olm/olm.h"
+    export *
+}

xcode/OLMKit/include/module.modulemap

@@ -0,0 +1,13 @@
+module OLMKit {
+    header "../OLMAccount.h"
+    header "../OLMSession.h"
+    header "../OLMMessage.h"
+    header "../OLMUtility.h"
+    header "../OLMInboundGroupSession.h"
+    header "../OLMOutboundGroupSession.h"
+    header "../OLMPkEncryption.h"
+    header "../OLMPkDecryption.h"
+    header "../OLMPkSigning.h"
+    header "../OLMSAS.h"
+    export *
+}