Add build script

.gitignore

@@ -1,4 +1,5 @@
 Externals
+DerivedData
 
 example/ios/iOS UI Test/DerivedData
 scripts/prebuilt.list

build.sh

@@ -0,0 +1,26 @@
+#!/bin/sh
+
+DERIVED_DATA_DIR="DerivedData"
+PRODUCTS_DIR="${DERIVED_DATA_DIR}/Build/Products"
+
+# carthage adds these, not sure if necessary
+EXTRA_ARGS="ONLY_ACTIVE_ARCH=NO CODE_SIGNING_REQUIRED=NO CODE_SIGN_IDENTITY="
+
+# libetpan has been set up to build an xcframework for libsasl2, however xcframeworks must exist at the *start* of the build process
+# I didn't have time to figure out something less awful than building libetpan first
+# It'll copy sasl.xcframework to the build directory
+xcodebuild -project build-mac/mailcore2.xcodeproj -scheme "libetpan ios" -configuration Release -derivedDataPath ${DERIVED_DATA_DIR} -sdk iphoneos ${EXTRA_ARGS}
+xcodebuild -project build-mac/mailcore2.xcodeproj -scheme "libetpan ios" -configuration Release -derivedDataPath ${DERIVED_DATA_DIR} -sdk iphonesimulator ${EXTRA_ARGS}
+
+# mailcore2 references the sasl.xcframework in the build directory
+xcodebuild -project build-mac/mailcore2.xcodeproj -scheme "mailcore ios" -configuration Release -derivedDataPath ${DERIVED_DATA_DIR} -sdk iphoneos ${EXTRA_ARGS}
+xcodebuild -project build-mac/mailcore2.xcodeproj -scheme "mailcore ios" -configuration Release -derivedDataPath ${DERIVED_DATA_DIR} -sdk iphonesimulator ${EXTRA_ARGS}
+
+# glue it all together
+# note -debug-symbols path has to be absolute, see https://developer.apple.com/forums/thread/655768
+xcodebuild -create-xcframework \
+    -framework "${PRODUCTS_DIR}/Release-iphoneos/MailCore.framework" \
+    -debug-symbols "${PWD}/${PRODUCTS_DIR}/Release-iphoneos/MailCore.framework.dSYM" \
+    -framework "${PRODUCTS_DIR}/Release-iphonesimulator/MailCore.framework" \
+    -debug-symbols "${PWD}/${PRODUCTS_DIR}/Release-iphonesimulator/MailCore.framework.dSYM" \
+    -output "${PRODUCTS_DIR}/MailCore.xcframework"