Error Lnk2019 Unresolved External Symbol _memset
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Error Lnk2019 Unresolved External Symbol Public
million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up How to use VC++ intrinsic functions w/o run-time library up vote 23 down vote favorite 9 I'm involved in
Error Lnk2019 Unresolved External Symbol Winmain@16 Referenced In Function ___tmaincrtstartup
one of those challenges where you try to produce the smallest possible binary, so I'm building my program without the C or C++ run-time libraries (RTL). I don't link to the DLL version or the static version. I don't even #include the header files. I have this working fine. Some RTL functions, like memset(), can be useful, so I tried adding my own implementation. It works fine in Debug builds (even for error lnk2019 unresolved external symbol visual studio 2010 those places where the compiler generates an implicit call to memset()). But in Release builds, I get an error saying that I cannot define an intrinsic function. You see, in Release builds, intrinsic functions are enabled, and memset() is an intrinsic. I would love to use the intrinsic for memset() in my release builds, since it's probably inlined and smaller and faster than my implementation. But I seem to be a in catch-22. If I don't define memset(), the linker complains that it's undefined. If I do define it, the compiler complains that I cannot define an intrinsic function. Does anyone know the right combination of definition, declaration, #pragma, and compiler and linker flags to get an intrinsic function without pulling in RTL overhead? Visual Studio 2008, x86, Windows XP+. To make the problem a little more concrete: extern "C" void * __cdecl memset(void *, int, size_t); #ifdef IMPLEMENT_MEMSET void * __cdecl memset(void *pTarget, int value, size_t cbTarget) { char *p = reinterpret_cast
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Error Lnk2019 Unresolved External Symbol Public __thiscall Referenced In Function _main
ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join error lnk2019 unresolved external symbol void __cdecl the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a error lnk2019 unresolved external symbol main referenced in function __tmaincrtstartup minute: Sign up memcmp linker error Visual Studio 2015 up vote 2 down vote favorite 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 http://stackoverflow.com/questions/2938966/how-to-use-vc-intrinsic-functions-w-o-run-time-library 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 http://stackoverflow.com/questions/34285476/memcmp-linker-error-visual-studio-2015 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 c++ visual-studio-2015 linker-error memcmp share|improve this question edited Dec 15 '15 at 10:19 asked Dec 15 '15 at 9:30 Roop 113 1 Possible duplicate of Why am I not able to build Vim with Visual Studio 2015 RC command line tools? –Humam Helfawi Dec 15 '15 at 9:36 i am having issue only with memcmp function which i have not used. I have used memcpy and memset in my code and those do not have any issues. –Roop Dec 15 '15 at 9:41 The verbose output says xstrcoll.obj referenecs _memcmp, so there's probably the answer to your first question. –stijn Dec 15 '15 at 9:49 what third party libraries are you using? Looks like an extern C / name mangling issue. –Phil Williams Dec 15 '15 at 10:34 No use of 3rd party libraries. –Roop Dec 15 '15 at 12:55 add a comment| 1 Answer 1 active oldest votes up vote 5 down vote 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
to avoid C/C++ runtime on Windows Dec. 12, 2014, 5:58 p.m. Edited by Mārtiņš Možeiko on Feb. 18, 2016, 6:50 a.m. Reason: typos Couple of times Casey mentioned on https://hero.handmade.network/forums/code-discussion/t/94 stream that it would be nice to avoid C/C++ runtime, but it could take too much time explaining and doing that. So I made a guide how to do that. These instructions will make your executable to consist only with code you are writing, no hidden code from runtime will be added (we'll add necessary stuff ourselves). First of all, error lnk2019 let's look at empty Windows application: 1 2 3 4 5 6 7 8 9 10#include