Importing swiftmodule create using `swiftc` gives utf-8 error

[divinenaman (Naman Agarwal)]

command to build swiftmodule:

swiftc lib.swift -L. -lclient -import-objc-header bridging-header.h -emit-module -emit-module-path ./client.swiftmodule

command to compile file using above module:

swiftc -I. example.swift client.swiftmodule

errors:

bridging-header-1.pch:1:314: error: source file is not valid UTF-8

error: failed to import bridging header