在Matlab中使用mex編譯C++失敗

（注意：詳細信息已更新。）我試圖在我的機器上安裝mYm（運行OS X 10.11.3的MacBook Pro 15）。編譯在Matlab使用MEX：在Matlab中使用mex編譯C++失敗

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

不過，我得到了下面的錯誤，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)

任何人誰可以幫助您完成安裝嚮導告訴我，也包括zlib的包括和lib fil es，但我不知道他們在哪裏？我已安裝XCode。

順便說一句：

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

來源

2016-02-25 c.jespersen

上面的代碼有兩個錯誤：首先你需要static_cast （長度），因爲你的編譯器不會從long到int的隱式轉換。第二個你需要#include 在mym.cpp中。最後，我認爲在C++模式下編譯mex代碼是沒有道理的，除非您知道如何在mex環境中使用C++對象，但我認爲您還沒有這樣做。 – user3528438

到目前爲止，謝謝。我修復了編譯錯誤。請立即檢查更新的錯誤。 –

你錯過了很多庫。找到這些庫並將它們傳遞給mex並加上-l和-L – user3528438

由於這是一個MySQL的包裝，它很可能是你需要針對其庫鏈接。

我還沒有嘗試過，但引述readme.txt文件included：

源可以使用以下命令進行編譯：
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開關來避免命名空間衝突）

注意：要編譯，zlib庫應該安裝在系統上（包括頭文件）。

來源

2016-03-23 06:44:53 Amro

在Matlab中使用mex編譯C++失敗

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