includes <cstring> or <string> rises compile errors

Question

Have simple console application that builds fine:

#include "stdafx.h"
int _tmain(int argc, _TCHAR* argv[])
{
    return 0;
}

It alsow builds fine if I add line #include <cstring> (or (and) #include <string>)

#include <cstring>
#include "stdafx.h"

int _tmain(int argc, _TCHAR* argv[])
{
    return 0;
}

If I add file gc.c just with only one include line ,#include <cstring> (or (and) #include <string>), compiler generates a lot of errors:

Error   2   error C2061: syntax error : identifier 'using'  C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  18  1   cstringerr
Error   43  error C2061: syntax error : identifier 'strxfrm'    C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  26  1   cstringerr
Error   41  error C2061: syntax error : identifier 'strtok' C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  26  1   cstringerr
Error   39  error C2061: syntax error : identifier 'strstr' C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  25  1   cstringerr
Error   37  error C2061: syntax error : identifier 'strspn' C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  25  1   cstringerr
Error   35  error C2061: syntax error : identifier 'strrchr'    C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  25  1   cstringerr
Error   33  error C2061: syntax error : identifier 'strpbrk'    C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  24  1   cstringerr
Error   31  error C2061: syntax error : identifier 'strncpy'    C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  24  1   cstringerr
Error   29  error C2061: syntax error : identifier 'strncmp'    C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  24  1   cstringerr
Error   27  error C2061: syntax error : identifier 'strncat'    C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  23  1   cstringerr
Error   25  error C2061: syntax error : identifier 'strlen' C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  23  1   cstringerr
Error   23  error C2061: syntax error : identifier 'strerror'   C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  23  1   cstringerr
Error   21  error C2061: syntax error : identifier 'strcspn'    C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  22  1   cstringerr
Error   19  error C2061: syntax error : identifier 'strcpy' C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  22  1   cstringerr
Error   17  error C2061: syntax error : identifier 'strcoll'    C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  22  1   cstringerr
Error   15  error C2061: syntax error : identifier 'strcmp' C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  21  1   cstringerr
Error   13  error C2061: syntax error : identifier 'strchr' C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  21  1   cstringerr
Error   11  error C2061: syntax error : identifier 'strcat' C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  21  1   cstringerr
Error   9   error C2061: syntax error : identifier 'memset' C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  20  1   cstringerr
Error   7   error C2061: syntax error : identifier 'memmove'    C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  20  1   cstringerr
Error   5   error C2061: syntax error : identifier 'memcpy' C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  20  1   cstringerr
Error   3   error C2061: syntax error : identifier 'memcmp' C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  18  1   cstringerr
Error   4   error C2059: syntax error : ';' C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  18  1   cstringerr
Error   6   error C2059: syntax error : ';' C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  20  1   cstringerr
Error   8   error C2059: syntax error : ';' C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  20  1   cstringerr
Error   10  error C2059: syntax error : ';' C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  20  1   cstringerr
Error   12  error C2059: syntax error : ';' C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  21  1   cstringerr
Error   14  error C2059: syntax error : ';' C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  21  1   cstringerr
Error   16  error C2059: syntax error : ';' C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  21  1   cstringerr
Error   18  error C2059: syntax error : ';' C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  22  1   cstringerr
Error   20  error C2059: syntax error : ';' C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  22  1   cstringerr
Error   22  error C2059: syntax error : ';' C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  22  1   cstringerr
Error   24  error C2059: syntax error : ';' C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  23  1   cstringerr
Error   26  error C2059: syntax error : ';' C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  23  1   cstringerr
Error   28  error C2059: syntax error : ';' C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  23  1   cstringerr
Error   30  error C2059: syntax error : ';' C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  24  1   cstringerr
Error   32  error C2059: syntax error : ';' C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  24  1   cstringerr
Error   34  error C2059: syntax error : ';' C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  24  1   cstringerr
Error   36  error C2059: syntax error : ';' C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  25  1   cstringerr
Error   38  error C2059: syntax error : ';' C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  25  1   cstringerr
Error   40  error C2059: syntax error : ';' C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  25  1   cstringerr
Error   42  error C2059: syntax error : ';' C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  26  1   cstringerr
Error   44  error C2059: syntax error : ';' C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  26  1   cstringerr
Error   1   error C2054: expected '(' to follow 'using' C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\cstring  18  1   cstringerr

Looks like compiler does't understands anything that exists in include.

What is wrong with including <cstring> or <string> in additional cpp file?

BTW (not related to your compiler error), if you are using stdafx.h for precompiled headers, then stdafx.h must be the first file to include. — Werner Henze
– Werner Henze, Commented Oct 10, 2012 at 11:14

jiten · Accepted Answer · 2012-10-10 11:08:54Z

0

Go to Property

Properties > C/C++ > Advanced > Compile As and check Compile as C++ Code(/TP)

And allways make habit to include the file like this

#include "stdafx.h"    //Always include it first then other files.
#include <cstring>

edited Oct 10, 2012 at 11:08

answered Oct 10, 2012 at 11:03

jiten

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3 Comments

vico Over a year ago

'Compile as C++ Code(/TP)' helped, but I suppose this is not a solution, because in some projects I will have both C and C++ libs. Why compiler acts in such a strange way?. I have turned off precompiled headers

Werner Henze Over a year ago

@user1501700: I don't understand that. You are compiling gc.cpp, which is a cpp file (C++) and you are using the C++ include file cstring but you are complaining that this code does not compile as C?

vico Over a year ago

My fall. I have gc.c, but not gc.cpp file. I have updated it in problem description

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