I have mongoose server in my iOS app, which call fork() system function:if ((pid = fork()) == -1) { // Parent send_http_error(conn, 500, http_500_error, "fork(): %s", strerror(ERRNO)); }Started from Xcode 11 beta I can't build the project. I see the following linker error:Undefined symbols for architecture x86_64:"___gcov_flush", referenced from: _spawn_process in mongoose.old: symbol(s) not found for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation)I tried comment fork() function and error disappeared.