VS2008 LIB的升级改造

今天用vs2019编译一个在vs2008下coding的工程的时候，vs给出了一堆链接错误信息，如下图所示的一些错误：

error 47 error lnk2019: unresolved external symbol "public: __thiscall std::_mutex::~_mutex(void)" (??1_mutex@std@@qae@xz) referenced in function "public: void __thiscall std::ios_base::clear(int,bool)" (?clear@ios_base@std@@qaexh_n@z) d:\server\mysqlpp.lib(dbdriver.obj) server

error 48 error lnk2001: unresolved external symbol "public: __thiscall std::_mutex::~_mutex(void)" (??1_mutex@std@@qae@xz) d:\server\mysqlpp.lib(datetime.obj) server

error 49 error lnk2001: unresolved external symbol "public: __thiscall std::_mutex::~_mutex(void)" (??1_mutex@std@@qae@xz) d:\server\mysqlpp.lib(stadapter.obj) server

error 50 error lnk2001: unresolved external symbol "public: __thiscall std::_mutex::~_mutex(void)" (??1_mutex@std@@qae@xz) d:\server\mysqlpp.lib(sqlstream.obj) server

error 51 error lnk2001: unresolved external symbol "public: __thiscall std::_mutex::~_mutex(void)" (??1_mutex@std@@qae@xz) d:\server\mysqlpp.lib(connection.obj) server

error 52 error lnk2001: unresolved external symbol "public: __thiscall std::_mutex::~_mutex(void)" (??1_mutex@std@@qae@xz) d:\server\mysqlpp.lib(mystring.obj) server

error 53 error lnk2001: unresolved external symbol "public: __thiscall std::_mutex::~_mutex(void)" (??1_mutex@std@@qae@xz) d:\server\mysqlpp.lib(row.obj) server

error 54 error lnk2001: unresolved external symbol "public: __thiscall std::_mutex::~_mutex(void)" (??1_mutex@std@@qae@xz) d:\server\mysqlpp.lib(query.obj) server

error 55 error lnk2001: unresolved external symbol "long const std::_badoff" (?_badoff@std@@3jb) d:\server\mysqlpp.lib(dbdriver.obj) server

error 56 error lnk2001: unresolved external symbol "long const std::_badoff" (?_badoff@std@@3jb) d:\server\mysqlpp.lib(datetime.obj) server

error 57 error lnk2001: unresolved external symbol "long const std::_badoff" (?_badoff@std@@3jb) d:\server\mysqlpp.lib(stadapter.obj) server

error 58 error lnk2001: unresolved external symbol "long const std::_badoff" (?_badoff@std@@3jb) d:\server\mysqlpp.lib(sqlstream.obj) server

error 59 error lnk2001: unresolved external symbol "long const std::_badoff" (?_badoff@std@@3jb) d:\server\mysqlpp.lib(connection.obj) server

error 60 error lnk2001: unresolved external symbol "long const std::_badoff" (?_badoff@std@@3jb) d:\server\mysqlpp.lib(mystring.obj) server

error 61 error lnk2001: unresolved external symbol "long const std::_badoff" (?_badoff@std@@3jb) d:\server\mysqlpp.lib(row.obj) server

error 62 error lnk2001: unresolved external symbol "long const std::_badoff" (?_badoff@std@@3jb) d:\server\mysqlpp.lib(query.obj) server

error 63 error lnk2001: unresolved external symbol "public: static void __cdecl std::_string_base::_xran(void)" (?_xran@_string_base@std@@saxxz) d:\server\mysqlpp.lib(qparms.obj) server

error 64 error lnk2001: unresolved external symbol "public: static void __cdecl std::_string_base::_xran(void)" (?_xran@_string_base@std@@saxxz) d:\server\mysqlpp.lib(sqlstream.obj) server

error 65 error lnk2001: unresolved external symbol "public: static void __cdecl std::_string_base::_xran(void)" (?_xran@_string_base@std@@saxxz) d:\server\mysqlpp.lib(options.obj) server

error 66 error lnk2001: unresolved external symbol "public: static void __cdecl std::_string_base::_xran(void)" (?_xran@_string_base@std@@saxxz) d:\server\mysqlpp.lib(field_types.obj) server

error 67 error lnk2019: unresolved external symbol "public: static void __cdecl std::_string_base::_xran(void)" (?_xran@_string_base@std@@saxxz) referenced in function "public: char __thiscall mysqlpp::sqltypeadapter::at(unsigned int)const " (?at@sqltypeadapter@mysqlpp@@qbedi@z) d:\server\mysqlpp.lib(stadapter.obj) server

error 68 error lnk2001: unresolved external symbol "public: static void __cdecl std::_string_base::_xran(void)" (?_xran@_string_base@std@@saxxz) d:\server\mysqlpp.lib(manip.obj) server

error 69 error lnk2001: unresolved external symbol "public: static void __cdecl std::_string_base::_xran(void)" (?_xran@_string_base@std@@saxxz) d:\server\mysqlpp.lib(null.obj) server

error 70 error lnk2001: unresolved external symbol "public: static void __cdecl std::_string_base::_xran(void)" (?_xran@_string_base@std@@saxxz) d:\server\mysqlpp.lib(datetime.obj) server

error 71 error lnk2001: unresolved external symbol "public: static void __cdecl std::_string_base::_xran(void)" (?_xran@_string_base@std@@saxxz) d:\server\mysqlpp.lib(type_info.obj) server

error 72 error lnk2001: unresolved external symbol "public: static void __cdecl std::_string_base::_xran(void)" (?_xran@_string_base@std@@saxxz) d:\server\mysqlpp.lib(vallist.obj) server

error 73 error lnk2001: unresolved external symbol "public: static void __cdecl std::_string_base::_xran(void)" (?_xran@_string_base@std@@saxxz) d:\server\mysqlpp.lib(field_names.obj) server

error 74 error lnk2001: unresolved external symbol "public: static void __cdecl std::_string_base::_xran(void)" (?_xran@_string_base@std@@saxxz) d:\server\mysqlpp.lib(query.obj) server

error 75 error lnk2001: unresolved external symbol "public: static void __cdecl std::_string_base::_xran(void)" (?_xran@_string_base@std@@saxxz) d:\server\mysqlpp.lib(dbdriver.obj) server

error 76 error lnk2001: unresolved external symbol "public: static void __cdecl std::_string_base::_xran(void)" (?_xran@_string_base@std@@saxxz) d:\server\mysqlpp.lib(tcp_connection.obj) server

error 82 error lnk2001: unresolved external symbol "public: static void __cdecl std::_string_base::_xlen(void)" (?_xlen@_string_base@std@@saxxz) d:\server\mysqlpp.lib(null.obj) server

问题总结：

       因为静态链接库mysqlpp.lib在旧版本ide上编译的，所以string类中符号被解析成形如 static void __cdecl _xran()或static void __cdecl _xlen() 

       而在高版本的vs2019上string中的_xran与_xlen符号则被解析成了__declspec(noreturn) void _xran() const或__declspec(noreturn) void _xlen() const

       所以才会在链接过程中出现上述开头出现的一堆问题

#include <string>

namespace std2008

{

class _string_base_2008

{

public:

{

__declspec(dllexport) void _xlen2008(void) const;

__declspec(dllexport) void _xran2008(void) const;

};

};

void std2008::_string_base_2008::_xran2008 () const

{

std::_string_base::_xran ();

}

void std2008::_string_base_2008::_xlen2008 () const

{

std::_string_base::_xlen ();

}

save this code as "compat.cpp" and compile with

cl /d_dll_export /ehsc /ld compat.cpp /link

now lets examine the lib file, that has been created:

dumpbin /exports compat.lib

in my case it looks like this:

dump of file compat.lib

file type: library

exports

ordinal name

?_xlen2008@_string_base_2008@std2008@@qbexxz (public: void __thiscall std2008::_string_base_2008::_xlen2008(void)const )

?_xran2008@_string_base_2008@std2008@@qbexxz (public: void __thiscall std2008::_string_base_2008::_xran2008(void)const )

when looking at the linker errors about missing symbols, you see the decoration that is required. in your case its "?_xran@_string_base@std@@saxxz" and "?_xlen@_string_base@std@@saxxz"

the last step is to tell the linker to create a library that maps the standard decorated names to a another name using the symbols from your linker error and the names taken from dumpbin.

cl /ehsc /ld compat.cpp /link /export:?_xran@_string_base@std@@saxxz=?_xran2008@_string_base_2008@std2008@@qbexxz /export:?_xlen@_string_base@std@@saxxz=?_xlen2008@_string_base_2008@std2008@@qbexxz

cl /ehsc /ld compat1.cpp /link /export:??0exception@std@@qae@abqbd@z=??exception_2008@std2008@@qaexabqbd@z

now add the "compat.lib" library as additional library to your project and now it should link successfully.

compact.c代码

#include <string>

namespace std2008

{

class _string_base_2008

{

public:

__declspec(dllexport) void _xlen2008(void) const;

__declspec(dllexport) void _xran2008(void) const;

};

};

void std2008::_string_base_2008::_xran2008 () const

{

std::_string_base::_xran ();

}

void std2008::_string_base_2008::_xlen2008 () const

{

std::_string_base::_xlen ();

}

生成dll和lib

cl /d_dll_export /ehsc /ld compat.cpp /link

生成可用的lib

cl /ehsc /ld compat.cpp /link /export:?_xran@_string_base@std@@saxxz=?_xran2008@_string_base_2008@std2008@@qbexxz /export:?_xlen@_string_base@std@@saxxz=?_xlen2008@_string_base_2008@std2008@@qbexxz

compact1.c代码

#include <string>

namespace std2008

{

class exception_2008

{

public:

__declspec(dllexport) exception_2008(char const * const & ch);

};

};

std2008::exception_2008::exception_2008(char const * const & ch)

{

std::exception::exception (ch);

}

生成dll和lib

cl /d_dll_export /ehsc /ld compat1.cpp /link

生成可用的lib

cl /ehsc /ld compat1.cpp /link /export:??0

exception@std@@qae@abqbd@z=??exception_2008@std2008@@qaexabqbd@z

将生成的compat.dll和compat1.dll拷贝至exe目录，compat.lib和compat1.lib则拷贝至源文件与mysqlpp.lib同一目录中，即可顺利编译了！！