Add shell script to build frameworks

Author: jurvis

.gitignore

@@ -20,3 +20,4 @@ ci/LDKSwift/.swiftpm
 xcode/LDK/*.h
 xcode/LDK/*.c
 xcuserdata/
+/xcode/LDK/build

xcode/LDK/build-frameworks.sh

@@ -0,0 +1,21 @@
+#!/usr/bin/env sh
+set -e # abort if any command fails
+
+BIN_OUTPUT_DIRECTORY="`pwd`/build"
+
+rm -rf $BIN_OUTPUT_DIRECTORY
+
+xcodebuild archive -scheme LDKFramework \
+  -destination "generic/platform=iOS Simulator" \
+  -archivePath ${BIN_OUTPUT_DIRECTORY}/LDKFramework-Sim \
+  SKIP_INSTALL=NO BUILD_LIBRARY_FOR_DISTRIBUTION=YES
+
+xcodebuild archive -scheme LDKFramework \
+  -destination "generic/platform=iOS" \
+  -archivePath ${BIN_OUTPUT_DIRECTORY}/LDKFramework-iOS \
+  SKIP_INSTALL=NO BUILD_LIBRARY_FOR_DISTRIBUTION=YES
+
+xcodebuild -create-xcframework \
+  -framework ${BIN_OUTPUT_DIRECTORY}/LDKFramework-iOS.xcarchive/Products/Library/Frameworks/LDKFramework.framework \
+  -framework ${BIN_OUTPUT_DIRECTORY}/LDKFramework-Sim.xcarchive/Products/Library/Frameworks/LDKFramework.framework \
+  -output ${BIN_OUTPUT_DIRECTORY}/LDKFramework.xcframework

xcode/LDK/build-libldk.sh

@@ -28,8 +28,6 @@ if [[ ${ACTION:-build} = "build" || $ACTION = "install" ]]; then
 
     if [[ $PLATFORM_NAME = "macosx" ]]; then
         RUST_TARGET_OS="darwin"
-    elif [[ $PLATFORM_NAME = "iphonesimulator" ]]; then
-        RUST_TARGET_OS="ios-sim"
     else
         RUST_TARGET_OS="ios"
     fi
@@ -62,6 +60,12 @@ if [[ ${ACTION:-build} = "build" || $ACTION = "install" ]]; then
         RUST_ARCH=$ARCH
         if [[ $RUST_ARCH = "arm64" ]]; then
             RUST_ARCH="aarch64"
+            # This is because iOS Simulator builds for x86_64 is `x86_64-apple-ios`, while arm64 is `aarch64-apple-ios-sim`
+            if [[ $PLATFORM_NAME = "iphonesimulator" ]]; then
+                RUST_TARGET_OS="ios-sim"
+            fi
+        else
+            RUST_TARGET_OS="ios"
         fi
 
         cargo build -Z build-std=panic_abort,std --features "std" --target "${RUST_ARCH}-apple-${RUST_TARGET_OS}" $RUST_CONFIGURATION_FLAG