"int8_t"：尝试将MySQL CPP连接器连接到Visual Studio 2010时Config.h中的重新定义错误

'int8_t' : redefinition error in config.h when trying to connect mysql cpp connector to visual studio 2010

本文关键字：Config 2010时 新定义 错误 定义 Studio Visual int8 连接 连接器 CPP      更新时间：2023-10-16

这是尝试使用Visual Studio编译我的文件时生成的完整错误报告。编译后的文件是在网络中找到的示例代码。它使用非常基本的方法直接连接到mysql数据库。

错误输出：

> 1>------ Build started: Project: mysql-sample, Configuration: Debug
> x64 ------ 1>Build started 16/06/2012 22:49:55. 1>PrepareForBuild: 1> 
> Creating directory "c:usersrupertt aryeen winddocumentsvisual
> studio 2010Projectsmysql-samplex64Debug".
> 1>InitializeBuildStatus: 1>  Creating
> "x64Debugmysql-sample.unsuccessfulbuild" because "AlwaysCreate" was
> specified. 1>ClCompile: 1>  stdafx.cpp 1>  mysql-sample.cpp
> 1>c:program filesmysqlconnector c++ 1.1.0includesqlstring.h(36):
> warning C4251: 'sql::SQLString::realStr' : class
> 'std::basic_string<_Elem,_Traits,_Ax>' needs to have dll-interface to
> be used by clients of class 'sql::SQLString' 1>          with 1>      
> [ 1>              _Elem=char, 1>             
> _Traits=std::char_traits<char>, 1>              _Ax=std::allocator<char> 1>          ] 1>C:Program FilesMySQLConnector C++ 1.1.0includemysql_connection.h(156):
> warning C4251: 'sql::mysql::MySQL_Connection::proxy' : class
> 'boost::shared_ptr<T>' needs to have dll-interface to be used by
> clients of class 'sql::mysql::MySQL_Connection' 1>          with 1>   
> [ 1>              T=sql::mysql::NativeAPI::NativeConnectionWrapper 1> 
> ] 1>C:Program FilesMySQLConnector C++
> 1.1.0includecppconn/exception.h(59): warning C4251: 'sql::SQLException::sql_state' : class
> 'std::basic_string<_Elem,_Traits,_Ax>' needs to have dll-interface to
> be used by clients of class 'sql::SQLException' 1>          with 1>   
> [ 1>              _Elem=char, 1>             
> _Traits=std::char_traits<char>, 1>              _Ax=std::allocator<char> 1>          ] 1>c:program filesmysqlconnector c++ 1.1.0includecppconnconfig.h(60): error
> C2371: 'int8_t' : redefinition; different basic types 1>         
> C:Program Files (x86)Microsoft Visual Studio
> 10.0VCincludestdint.h(17) : see declaration of 'int8_t' 1>c:program filesmysqlconnector c++
> 1.1.0includecppconnconfig.h(60): error C2371: 'int8_t' : redefinition; different basic types 1>          C:Program Files
> (x86)Microsoft Visual Studio 10.0VCincludestdint.h(17) : see
> declaration of 'int8_t' 1> 1>Build FAILED. 1> 1>Time Elapsed
> 00:00:12.92
> ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

看起来您应该能够通过在项目设置中设置以下宏定义来解决此问题：

HAVE_INT8_T=1

或者/DHAVE_INT8_T=1如果您使用的是命令行。

实际上，您可能应该在项目中设置以下宏定义：

HAVE_STDINT_H=1
CPPCONN_DONT_TYPEDEF_MS_TYPES_TO_C99_TYPES=1

这应该使MySQL连接器标头仅依赖于C99整数类型名的stdint.h，而不是尝试自行定义其中任何一个。

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