Solved

Unresolved External Symbols

Posted on 2016-09-19
3
204 Views
Last Modified: 2016-09-22
Hi.  I am trying to compile old C++ code using Visual Studio 2015, and I am getting "unresolved external symbols" errors such as the following:

Error	LNK2001	unresolved external symbol __imp___sys_errlist	
Error	LNK2001	unresolved external symbol __imp___iob	
Error	LNK2001	unresolved external symbol __imp___pctype	
Error	LNK2001	unresolved external symbol __imp___sys_nerr	
Error	LNK2001	unresolved external symbol __imp____mb_cur_max	

Open in new window


I tried various suggestions from the Internet, but nothing seems to resolve this issue.  Could you please provide me with suggestions?  (Please let me know if I need to provide more information.)  Thank you.
0
Comment
Question by:deatc
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
3 Comments
 
LVL 29

Expert Comment

by:pepr
ID: 41805165
Errors like that mean that you have the sources and headers, but you did not specified the library for the linker.

Have a look here https://msdn.microsoft.com/en-us/library/ms235627.aspx#BKMK_UseLibInApp
0
 
LVL 34

Accepted Solution

by:
sarabande earned 500 total points
ID: 41806694
the ___imp___ prefix is an indication that the externals should be instantiated by an 'implementation class' what is a technique used by 3rd-party or library vendors to hide some or the greater part of their implementation Interface only in object code and not in header files. as pepr has told, the missing instantiation of the externals normally should be provided by a library which you would need to add to the linker - input - additional dependencies for both debug and release configuration.

to find out which library is missing you may look into the old project file (or makefile). the Project files have Extension .vcxproj, .vcproj, or .dsp depending on the vs version. open it with c++ text editor (open with ... menu item) and look for .lib files. check whether all the .lib files defined for the link command also were used in the new project linker properties.

Sara
0
 

Author Closing Comment

by:deatc
ID: 41811410
Thanks!
0

Featured Post

VIDEO: THE CONCERTO CLOUD FOR HEALTHCARE

Modern healthcare requires a modern cloud. View this brief video to understand how the Concerto Cloud for Healthcare can help your organization.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Errors will happen. It is a fact of life for the programmer. How and when errors are detected have a great impact on quality and cost of a product. It is better to detect errors at compile time, when possible and practical. Errors that make their wa…
What is C++ STL?: STL stands for Standard Template Library and is a part of standard C++ libraries. It contains many useful data structures (containers) and algorithms, which can spare you a lot of the time. Today we will look at the STL Vector. …
The viewer will learn how to user default arguments when defining functions. This method of defining functions will be contrasted with the non-default-argument of defining functions.
The viewer will be introduced to the technique of using vectors in C++. The video will cover how to define a vector, store values in the vector and retrieve data from the values stored in the vector.
Suggested Courses

623 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question