在静态库工程中添加ASIHTTPRequest导出lib.a，放到工程里编译出一下错：
Undefined symbols for architecture armv7:
"_deflate", referenced from:
-[ASIDataCompressor compressBytes:length:error:shouldFinish:] in lib.a(ASIDataCompressor.o)
"_inflateInit2_", referenced from:
-[ASIDataDecompressor setupStream] in lib.a(ASIDataDecompressor.o)
"_deflateEnd", referenced from:
-[ASIDataCompressor closeStream] in lib.a(ASIDataCompressor.o)
"_inflateEnd", referenced from:
-[ASIDataDecompressor closeStream] in lib.a(ASIDataDecompressor.o)
"_kUTTagClassMIMEType", referenced from:
+[ASIHTTPRequest mimeTypeForFileAtPath:] in lib.a(ASIHTTPRequest.o)
"_kUTTagClassFilenameExtension", referenced from:
+[ASIHTTPRequest mimeTypeForFileAtPath:] in lib.a(ASIHTTPRequest.o)
"_deflateInit2_", referenced from:
-[ASIDataCompressor setupStream] in lib.a(ASIDataCompressor.o)
"_UTTypeCreatePreferredIdentifierForTag", referenced from:
+[ASIHTTPRequest mimeTypeForFileAtPath:] in lib.a(ASIHTTPRequest.o)
"_inflate", referenced from:
-[ASIDataDecompressor uncompressBytes:length:error:] in lib.a(ASIDataDecompressor.o)
"_UTTypeCopyPreferredTagWithClass", referenced from:
+[ASIHTTPRequest mimeTypeForFileAtPath:] in lib.a(ASIHTTPRequest.o)
ld: symbol(s) not found for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)
解决方法：
缺系统库的原因，添加以下库
libz.dylib
SystemConfiguration.framework
MobileCoreAServices.framework
CFNetwork.framework
完成
原文：http://blog.csdn.net/feiyue0823/article/details/46453641