warning:dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]

[amberberchuang]

i just got error when compiling shadowsocks src/udprelay.c:557:5: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing] ev_io_init(&ctx->io, server_recv_cb, fd, EV_READ); ^ src/udprelay.c:557:5: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing] src/udprelay.c:557:5: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing] src/udprelay.c:557:5: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing] In file included from ./libcork/core/byte-order.h:16:0, from ./libcork/core/hash.h:16, from ./libcork/core/callbacks.h:14, from ./libcork/core/allocator.h:18, from ./libcork/core.h:15, from src/udprelay.c:50: src/udprelay.c: In function 'remote_timeout_cb': ./libcork/core/types.h:79:59: warning: pointer of type 'void ' used in arithmetic [-Wpointer-arith] ((struct_type ) (- offsetof(struct_type, field_name) + \ ^ src/udprelay.c:604:11: note: in expansion of macro 'cork_container_of' = cork_container_of(watcher, remote_ctx_t, watcher); ^ src/udprelay.c: In function 'remote_recv_cb': src/udprelay.c:710:32: warning: cast increases required alignment of target type [-Wcast-align] remote_ctx_t remote_ctx = (remote_ctx_t )w; ^ src/udprelay.c: In function 'server_recv_cb': src/udprelay.c:1259:17: warning: implicit declaration of function 'set_broadcast' [-Wimplicit-function-declaration] set_broadcast(remotefd); ^ src/udprelay.c:1279:35: error: 'remote_ctx_t' has no member named 'dst_addr' memcpy(&remote_ctx->dst_addr, &dst_addr, sizeof(struct sockaddr_storage)); ^ compilation terminated due to -Wfatal-errors.