Xcode 10: Code Signing my App+Framework fails, because of failure signing 3rd party dependency framework (PromiseKit). Works in Xcode 9

Try this! It worked for me and many other people:

Goto

Build phases > Add > New Run Script Phase

The code should work for any default shell, but I recommend just using /bin/sh

and include the following code:

# Type a script or drag a script file from your workspace to insert its path.
# skip if we run in debug
if [ "$CONFIGURATION" == "Debug" ]; then
echo "Skip frameworks cleaning in debug version"
exit 0
fi

APP_PATH="${TARGET_BUILD_DIR}/${WRAPPER_NAME}"

# This script loops through the frameworks embedded in the application and
# removes unused architectures.
find "$APP_PATH" -name '*.framework' -type d | while read -r FRAMEWORK
do
FRAMEWORK_EXECUTABLE_NAME=$(defaults read "$FRAMEWORK/Info.plist" CFBundleExecutable)
FRAMEWORK_EXECUTABLE_PATH="$FRAMEWORK/$FRAMEWORK_EXECUTABLE_NAME"
echo "Executable is $FRAMEWORK_EXECUTABLE_PATH"

EXTRACTED_ARCHS=()

for ARCH in $ARCHS
do
echo "Extracting $ARCH from $FRAMEWORK_EXECUTABLE_NAME"
lipo -extract "$ARCH" "$FRAMEWORK_EXECUTABLE_PATH" -o "$FRAMEWORK_EXECUTABLE_PATH-$ARCH"
EXTRACTED_ARCHS+=("$FRAMEWORK_EXECUTABLE_PATH-$ARCH")
done

echo "Merging extracted architectures: ${ARCHS}"
lipo -o "$FRAMEWORK_EXECUTABLE_PATH-merged" -create "${EXTRACTED_ARCHS[@]}"
rm "${EXTRACTED_ARCHS[@]}"

echo "Replacing original executable with thinned version"
rm "$FRAMEWORK_EXECUTABLE_PATH"
mv "$FRAMEWORK_EXECUTABLE_PATH-merged" "$FRAMEWORK_EXECUTABLE_PATH"

done

It seems hat some frameworks ship architectures, that will not be used in the application. Xcode will refuse to sign them. The above script removes unused architectures.

Credits: Some guy at GitHub, I can't find the exact source anymore.

Same issue here. The only workaround I've found is to use static library instead of framework.

In case you are not able to use static library, you'd better file a bug report to Apple.