I have a MFC project which uses C++ Rest SDK (Casablanca) under Visual Studio 2012 to implement an http client connection and it can be compiled well.
Then I add a Microsoft unit test project, but I can’t build the unit test project successfully.
In my main project, the environment is set as “Use MFC in a Static Library”, “No Common Language Runtime Support” and “Multi-threaded Debug (/MTd).” And my test project’s environment is same as main project. The error message shows:
“error LNK2005: "void * __cdecl operator new[](unsigned int)" (??_U#YAPAXI#Z) already defined in libcpmtd.lib(newaop.obj).”
In addition, I also try to change the test project’s environment to “Common Language Runtime Support (/clr)” and “Multi-threaded Debug DLL (/MDd).” The original error disappears but new error comes:
“error C1189: #error : is not supported when compiling with /clr or /clr:pure. c:\program files (x86)\microsoft visual studio 11.0\vc\include\atomic line 9”
I do not know how to overcome these problems. Can anyone please give me some suggestions or resolutions? Thanks.
The CRT libraries use weak external linkage for the new, delete functions. The MFC libraries also contain new, delete functions. These functions require the MFC libraries to be linked before the CRT library is linked. Please check http://support.microsoft.com/kb/148652
Solution based on VS2005:
go to project>properties>configuration properties>linker>input
add to "Additional dependency" -> Nafxcwd.lib Libcmtd.lib
add to "ignore specific library" -> Nafxcwd.lib;Libcmtd.lib
I have found that by using NuGet Packmanager to get rest sdk i.e. Search for Casablanca and select cpprestsdk.v140.windesktop. This makes sure all the dlls, libs required are referenced.
Please check:
https://github.com/Microsoft/cpprestsdk/wiki/How-to-use-the-C---Rest-SDK-NuGet-package
http://codename26.rssing.com/chan-8623770/all_p85.html
Related
Configuration I have
Windows 10 64bit
Visual Studio Community 2017 with Visual C++ 2017
CMake 3.9.0
opencv 3.3.0
Aim
Goal is to build opencv as a static library (.lib) and include into a Visual C++ project which is a DLL. Everything should be compiled for x86 architecture or simply 32bit.
Process
Latest opencv distributive does not contain dll's compiled for 32bit system and therefore, I need to compile own version. According to the opencv 2.4 documentation on "installation in Windows". I have compiled the library with BUILD_SHARED_LIBS option disabled and configured target project as described in "how to build applications with OpenCV inside the Microsoft Visual Studio".
Compilation of my project fails with following errors (totally error count is greater than 800)
Error type 1
LNK2038 mismatch detected for 'RuntimeLibrary': value 'MTd_StaticDebug'
doesn't match value 'MDd_DynamicDebug' in main.obj
\opencv_core320d.lib(alloc.obj)
Error type 2
LNK2005 "public: void __thiscall std::basic_ostream<char,struct
std::char_traits<char> >::_Osfx(void)" (?_Osfx#?$basic_ostream#DU?
$char_traits#D#std###std##QAEXXZ) already defined in
opencv_core320d.lib(system.obj) \msvcprtd.lib(MSVCP140D.dll)
Error type 3
LNK2001 unresolved external symbol _ippicviHSVToRGB_16u_C3R#24
\opencv_imgproc320d.lib(color.obj)
I believe it may be due to uncoordinated compilation options or erroneous configuration of my project, but because I am heavy Linux user I experience difficulties with setting up these things on Windows.
Update
After I have matched configuration shown in the screen below block of errors about code generation mismatch disappeared, but undefined references are still there.
Thank you for help!
To resolve "Error type 3" add *.lib files from "staticlib" dir to "Linker->Input->Additional Dependencies". For example "_ipp" symbols are defined in "ipp_iw.lib" and "ippicvmt.lib".
Just for info. I successfully built opencv from sources as a static and shared library (as opencv_world3**.lib) using MSVS 2012 and cmake 3.9.0. But also done that with MSVS 2017 community.
PS. Maybe a TYPO but you said that you use opencv 3.3.0 but in error messages there is opencv_core320d.lib
PPS. "Error type 1" is the result of using static debug runtime version in opencv_core (MTd) and dynamic debug runtime in your app (MDd)
I always have the same problems. This is why I have a property sheet ready for use.
The steps to follow for static compilation are:
Remember to Build the INSTALL project in the CMake generated Solution. Let's call $(OPENCV_DIR) the folder where the install happened (usually something like xxx\install). You can create an environment variable for this.
Add in front of [Configuration Properties]->[VC++ Directories]->[Include Directories] $(OPENCV_DIR)\include;. The semicolon is to separate paths.
Add in front of [Configuration Properties]->[VC++ Directories]->[Library Directories] $(OPENCV_DIR)\x86\vc15\staticlib;.
Match the runtime library linkage mode between OpenCV and your project. If you unselect BUILD_SHARED_LIBS by default the CRT is statically linked (/MT for Release or /MTd for Debug). If you want it dynamically linked deselect BUILD_WITH_STATIC_CRT. So, as you already realized, fix it in [Configuration Properties]->[C/C++]->[Code Generation]->[Runtime Library].
Copy all filenames matching *.lib (*d.lib for Debug) and add them in [Configuration Properties]->[Linker]->[Input]->[Additional Dependencies] separated by semicolons.
It's quite painful, so do it once in a Property Sheet and just include it when needed.
I have a visual studio 2012 c++ project.
I recently uninstalled it and installed visual studio 2015 and upgraded the project.
When i am building the project, getting error as shown below:
Error LNK2019 unresolved external symbol _memcmp referenced in function
Moreover i have not used anywhere in my code memcmp fucntion.
I used the linker verbose function and could see below in output file:
Found _memcmp
Referenced in MyC++Project.obj
Referenced in libcpmtd.lib(xstrcoll.obj)
Loaded libvcruntimed.lib(__memcmp_.obj)
Two questions here
1.even though i have not used memcmp in my code why i am getting that linker error?
2.why is memcmp being loaded as __memcmp_.obj
I have the following settings also in my project:
1.C++-->Code generation-->Runtime Library is set to /MTd
2.Linker-->Ignore All default libraries is set to nothing
I have tried all the project settings but everything in vain.
I have issue only with this memcmp function which i have not used.
I have used mamcpy and memset and do not have issue with those
Explicitly add vcruntime.lib or other appropriate version of CRT Library to linker parameters (additional dependencies).
When you use memcmp explicitly it is probably handled as intrinsic function and is compiled as inline function.
Try to add vcruntime.lib and ucrt.lib to your additional dependencies. ===> properties->Linker->Input->Additional Dependencies
Sample path of 'vcruntime.lib': "C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\lib\vcruntime.lib"
Sample path of 'ucrt.lib' : "C:\Program Files (x86)\Windows Kits\10\Lib\10.0.16299.0\ucrt\x86\ucrt.lib"
My environment: VS2017 (v141)
I've run into this same problem with a legacy Visual C++ 6.0 nmake file with Visual Studio 2015.
This blog article, Introducing the Universal CRT, describes how the Visual Studio 2015 runtime has been split into more than one library. The runtime is now "split the CRT into two logical parts: The VCRuntime, which contained the compiler support functionality required for things like process startup and exception handling, and a “stable” part that contained all of the purely library parts of the CRT" to allow for easier updates.
So long as you do not link with the /nodefaultlib option, all of the
correct library files will be found when you link your project. If you
link with the /nodefaultlib option, you will need to link several
extra libraries when you link. For example, whereas you previously
might have just linked msvcrt.lib in order to use the CRT DLL, you
will now also need to link vcruntime.lib and ucrt.lib. Here is a table
that shows which libraries you will need to link for each “flavor” of
the libraries:
Release DLLs (/MD ): msvcrt.lib vcruntime.lib ucrt.lib
Debug DLLs (/MDd): msvcrtd.lib vcruntimed.lib ucrtd.lib
Release Static (/MT ): libcmt.lib libvcruntime.lib libucrt.lib
Debug Static (/MTd): libcmtd.lib libvcruntimed.lib libucrtd.lib
See also the Microsoft documentation C runtime (CRT) and C++ Standard Library (STL) .lib files which describes details about the libraries.
See also Microsoft C/C++ change history 2003 - 2015.
I'm compiling a legacy Visual Studio 6.0 C++ application in Visual Studio 2015 and I've run into this error and searching the net hasn't yielded any useful information.
LNK2019 unresolved external symbol __except_handler4_common referenced in function __except_handler4 (MSVCRT.lib)
I understand that somewhere in the code is referencing a method no longer(?) present in current versions of MSVCRT. Is there a workaround / compiler flag for this?
The error message is actually saying the the function __except_handler4, defined in MSVCRT.LIB, references the undefined symbol __except_handler4_common. So it's not your code that's making the this reference, it's Visual Studio 2015's code.
The symbol __except_handler4_common is defined in vcruntime.lib. This file should be automatically be linked in. I'm not sure why it wasn't. Did you select the static runtime library in the project options ("Multi-threaded (/MT)"), but then manually add MSVCRT.LIB (part of the dynamic C runtime libary)?
In your library project, check Properties -> C/C++ -> Code Generation -> Runtime Library
Chances are it's set to "Multi Threaded Debug DLL" (/MDd).
If that's the case then try changing it to "Multi Threaded Debug" (/MTd) and rebuild (that worked for me).
The reason for this error depends.
For me it was "libcmt.lib" and "libcmtd.lib" listed explicitly among linker inputs, rather than by selecting it from "Runtime Library" field in GUI.
For me, I was linking to the objects of a static project from a non-static unit test. I tried setting the unit test to static build, but then the compiler (VC++ 2015) got the error An internal error has occurred in the compiler. I ended up setting both the main project and the unit test project to "Use MFC in a Shared DLL", and then it worked.
I'm using Microsoft Visual Studio and an SDK to develop an app. The SDK includes the files listed above. I'm coding in C++. I'm not sure what I need to include to be able to use the SDK.
I did the things below and tried building a simple hello world app but I keep getting the error LNK2019: unresolved external symbol_WinMain#16 referenced in function __tmainCRTStartup
What I've Done:
1)Right Click-Properties-Linker-Additional Library Directories-Changed path to where I have the lib folder on my computer.
2)Same but added the Inc folder that came with the SDK to C/C++ Additional Include Directories.
By doing the above I assume I am linking the lib and .h files to the project that came with the SDK. The SDK also came with .dll files which I have done nothing with. You can use a few different languages with the SDK so I'm not sure what I need to use and not use.
However, the header files are not showing up under external dependencies.
I guess I should note that I have tried to run it a couple times before this and am not sure if that could be causing an issue building it.
Thanks.
The error you're seeing has nothing to do with header files or source code. The error is due to you not choosing the correct Visual Studio project.
If you are writing a console program, and you defined a main() function as the entry point, then you should be choosing a Win32 Console Application project from Visual Studio.
The error stems from the program looking for the WinMain function, and that function exists when you choose a Win32 Project. Usually these projects are for building GUI-based Win32 apps.
I'm trying to set up OpenCV 2.4 as follows:
I've downloaded and extracted the precompiled package to C:\OpenCV240.
In Visual Studio, I've added C:\OpenCV240\build\include as an additional include directory.
Furthermore, I've added C:\OpenCV240\build\x86\vc10\staticlib as an additional library directory.
And I've specified all available .lib files as additional dependencies.
When I compile my "Hello World" program (which compiles just fine when using the DLLs), I get a lot error messages like this:
1>msvcprtd.lib(MSVCP100D.dll) : error LNK2005: "public: __thiscall std::_Container_base12::~_Container_base12(void)" (??1_Container_base12#std##QAE#XZ) already defined in opencv_core240d.lib(matrix.obj)
What am I doing wrong?
It sounds like you need to specify linking against the static C runtime library in your program.
If OpenCV linked against the static CRT and you use the dynamic one, you get these types of redefinition errors.
To change this setting, open your project's Properties and go to Configuration Properties -> C/C++ -> Code Generation.
Change Runtime Library from Multi-threaded Debug DLL (/MDd) to Multi-threaded Debug (/MTd). Do the same for your other configurations, using the non-Debug variant where appropriate.