Support multiple architectures per platform

Add Package.swift

LibWally.xcodeproj/project.pbxproj

@@ -46,6 +46,7 @@
 
 /* Begin PBXFileReference section */
 		754D4D172811111B00216F1E /* libsecp256k1.a */ = {isa = PBXFileReference; lastKnownFileType = archive.ar; name = libsecp256k1.a; path = "CLibWally/libwally-core/src/secp256k1/.libs/libsecp256k1.a"; sourceTree = "<group>"; };
+		757DBE97281E181D00AE30F2 /* Package.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Package.swift; sourceTree = "<group>"; };
 		75F6BECF281F6F650072D4DE /* LibWallyCore */ = {isa = PBXFileReference; lastKnownFileType = archive.ar; name = LibWallyCore; path = "CLibWally/libwally-core/build/LibWallyCore"; sourceTree = "<group>"; };
 		75F6BED0281F6F650072D4DE /* libsecp256k1 */ = {isa = PBXFileReference; lastKnownFileType = archive.ar; name = libsecp256k1; path = "CLibWally/libwally-core/build/libsecp256k1"; sourceTree = "<group>"; };
 		A20557A522C6CDBE007221AA /* LibWally.modulemap */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = "sourcecode.module-map"; path = LibWally.modulemap; sourceTree = "<group>"; };
@@ -104,6 +105,7 @@
 		FE9CD3A7229C397900345DFA = {
 			isa = PBXGroup;
 			children = (
+				757DBE97281E181D00AE30F2 /* Package.swift */,
 				A20C942622C6BDB000B0D206 /* CLibWally */,
 				FE39CDF5229D534100DD135E /* DemoPlayground.playground */,
 				FE9CD3B3229C397900345DFA /* LibWally */,

Package.swift

@@ -0,0 +1,26 @@
+// swift-tools-version:5.3
+import PackageDescription
+
+let tag = "0.0.7"
+let checksum = "62aca7cefdf59cfe96d152e12cfd56387e9960e99523527ff478508f70ac25da"
+let url = "https://github.com/jurvis/libwally-swift/releases/download/\(tag)/LibWally.xcframework.zip"
+
+let package = Package(
+    name: "LibWally",
+    platforms: [
+        .iOS(.v11)
+    ],
+    products: [
+        .library(
+            name: "LibWally",
+            targets: ["LibWally"]
+        )
+    ],
+    targets: [
+        .binaryTarget(
+            name: "LibWally",
+            url: url,
+            checksum: checksum
+        )
+    ]
+)

build-libwally-swift.sh

@@ -12,6 +12,13 @@ xcodebuild archive -scheme LibWally \
   -archivePath ${BIN_OUTPUT_DIRECTORY}/LibWally-Sim \
   SKIP_INSTALL=NO BUILD_LIBRARY_FOR_DISTRIBUTION=YES
 
+# We want to clean the libwally-core static build files for simulator so we can
+# build the ones for device.
+pushd CLibWally/libwally-core
+  make clean
+  rm -rf $(pwd)/build
+popd
+
 xcodebuild archive -scheme LibWally \
   -destination "generic/platform=iOS" \
   -archivePath ${BIN_OUTPUT_DIRECTORY}/LibWally-iOS \