在Matlab中使用mex编译C++失败

（注意：详细信息已更新。）我试图在我的机器上安装mYm（运行OS X 10.11.3的MacBook Pro 15）。编译在Matlab使用MEX：在Matlab中使用mex编译C++失败

> mex -I/usr/local/mysql/include -L/usr/local/mysql/lib mym.cpp;

不过，我得到了下面的错误，我不能解析：

Building with 'Xcode Clang++'. 
Error using mex 
Undefined symbols for architecture x86_64: 
    "_compress", referenced from: 
     _mexFunction in mym.o 
    "_compressBound", referenced from: 
     _mexFunction in mym.o 
    "_mysql_affected_rows", referenced from: 
     _mexFunction in mym.o 
    "_mysql_close", referenced from: 
     _mexFunction in mym.o 
    "_mysql_data_seek", referenced from: 
     _mexFunction in mym.o 
    "_mysql_error", referenced from: 
     _mexFunction in mym.o 
    "_mysql_fetch_fields", referenced from: 
     _mexFunction in mym.o 
    "_mysql_fetch_lengths", referenced from: 
     _mexFunction in mym.o 
    "_mysql_fetch_row", referenced from: 
     _mexFunction in mym.o 
    "_mysql_field_count", referenced from: 
     _mexFunction in mym.o 
    "_mysql_free_result", referenced from: 
     _mexFunction in mym.o 
    "_mysql_get_client_info", referenced from: 
     _mexFunction in mym.o 
    "_mysql_get_host_info", referenced from: 
     _mexFunction in mym.o 
    "_mysql_get_server_info", referenced from: 
     _mexFunction in mym.o 
    "_mysql_init", referenced from: 
     _mexFunction in mym.o 
    "_mysql_num_fields", referenced from: 
     _mexFunction in mym.o 
    "_mysql_num_rows", referenced from: 
     _mexFunction in mym.o 
    "_mysql_ping", referenced from: 
     _mexFunction in mym.o 
    "_mysql_query", referenced from: 
     _mexFunction in mym.o 
    "_mysql_real_connect", referenced from: 
     _mexFunction in mym.o 
    "_mysql_real_escape_string", referenced from: 
     _mexFunction in mym.o 
    "_mysql_real_query", referenced from: 
     _mexFunction in mym.o 
    "_mysql_select_db", referenced from: 
     _mexFunction in mym.o 
    "_mysql_stat", referenced from: 
     _mexFunction in mym.o 
    "_mysql_store_result", referenced from: 
     _mexFunction in mym.o 
    "_uncompress", referenced from: 
     deserialize(char const*, unsigned long) in mym.o 
ld: symbol(s) not found for architecture x86_64 
clang: error: linker command failed with exit code 1 (use -v to see invocation)

任何人谁可以帮助您完成安装向导告诉我，也包括zlib的包括和lib fil es，但我不知道他们在哪里？我已安装XCode。

顺便说一句：

>> mex -setup 
MEX configured to use 'Xcode with Clang' for C language compilation.

来源

2016-02-25 c.jespersen

上面的代码有两个错误：首先你需要static_cast （长度），因为你的编译器不会从long到int的隐式转换。第二个你需要#include 在mym.cpp中。最后，我认为在C++模式下编译mex代码是没有道理的，除非您知道如何在mex环境中使用C++对象，但我认为您还没有这样做。 – user3528438

到目前为止，谢谢。我修复了编译错误。请立即检查更新的错误。 –

你错过了很多库。找到这些库并将它们传递给mex并加上-l和-L – user3528438

由于这是一个MySQL的包装，它很可能是你需要针对其库链接。

我还没有尝试过，但引述readme.txt文件included：

源可以使用以下命令进行编译：
mex -I[mysql_include_dir] -I[zlib_include_dir] -L[mysql_lib_dir] -L[zlib_lib_dir] -lz -lmysqlclient mym.cpp 
（在Mac OS X也可能需要-lSystemStubs开关来避免命名空间冲突）

注意：要编译，zlib库应该安装在系统上（包括头文件）。

来源

2016-03-23 06:44:53 Amro

在Matlab中使用mex编译C++失败

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