webrtc在ios生成静态framework问题

webrc如何在ios端生成静态framework？现在生成的都是动态framework。
动态framework：

$ file WebRTC.framework/WebRTC
WebRTC.framework/WebRTC: Mach-O universal binary with 4 architectures: [x86_64:Mach-O 64-bit dynamically linked shared library x86_64] [arm64]
WebRTC.framework/WebRTC (for architecture x86_64):  Mach-O 64-bit dynamically linked shared library x86_64
WebRTC.framework/WebRTC (for architecture i386):    Mach-O dynamically linked shared library i386
WebRTC.framework/WebRTC (for architecture armv7):   Mach-O dynamically linked shared library arm_v7
WebRTC.framework/WebRTC (for architecture arm64):   Mach-O 64-bit dynamically linked shared library arm64

静态framework：

$ file WebRTC.framework/WebRTC
WebRTC.framework/WebRTC: Mach-O universal binary with 4 architectures: [i386:current ar 
archive random library] [arm64]
WebRTC.framework/WebRTC (for architecture i386):    current ar archive random library
WebRTC.framework/WebRTC (for architecture armv7):   current ar archive random library
WebRTC.framework/WebRTC (for architecture x86_64):  current ar archive random library
WebRTC.framework/WebRTC (for architecture arm64):   current ar archive random library

注：webrtc版本m84