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98d8f194e5
When use clang-3.8 to build the NetworkPkg, compiler optimization may use memcpy for memory copy. For example: CryptoPkg/Library/OpensslLib/openssl/ssl/ssl_rsa.c:918: undefined reference to `memcpy'` Compiler optimization is sophisticated, but we can work around it use __attribute__((__used__)) to informs the compiler that symbol should be retained in the object file, even if it may be unreferenced. Cc: Jian J Wang <jian.j.wang@intel.com> Cc: Dandan Bi <dandan.bi@intel.com> Signed-off-by: Xiaoyu Lu <xiaoyux.lu@intel.com> Reviewed-by: Liming Gao <liming.gao@intel.com>