Error including ctype.h source

[Veter]

I have included #include <ctype.h> into my souce.

It gives me error: Link Error   : Undefined : "__ctype_mapC" Referenced from "isprint" in *.cpp

The reference looks like this:

if ( isprint( dataBuffer[i] ) )
{
 //do your thing
}

Why I can't include regular header files?

Is there anything special I need to do in order to include c header files?

[mccPaul]

Hi Veter,

You can't include C headers in C++ files unless you tell the compiler that the included code is C and not C++. This is because the C and C++ functions are called in different ways.

You tell the compiler that the files are C by using this construct:

Code:

extern "C"{// C function declarations as normal...}

 

If you are including your own headers, it is a good idea to use #defines like so:

Code:

// At the start of the header file put this:#ifdef __cplusplusextern "C" {#endif // At the end of the header put this:#ifdef __cplusplus}#endif

 
If you are using system headers that you cannot modify do this where you include them:

Code:

extern "C"{#include "ctype.h"}

Cheers,

Paul.

[Veter]

Hi Paul,

I tried the same thing with <time.h>, but I still get error. It seems that "time_t" structure is not recognized in CodeWarrior for ColdFire version 6.3.

My include statement is following:

#ifdef __cplusplus

extern "C" {

#endif

#include <time.h>

#ifdef __cplusplus

}

#endif

Any idea how can I include support for time_t and time support bypassing MSL?

[mccPaul]

Hi,

It depends on the libraries you are using (I don't use CodeWarrior), but I suspect that the time_t type is typedef'd in sys/types.h, so you would need to do this:

#ifdef __cplusplus

extern "C" {

#endif

#include <sys/types.h>

#include <time.h>

#ifdef __cplusplus

}

#endif

What is the linker error that you are getting, if that doesn't work?

Paul.

Message Edited by mccp on 2007-04-2305:25 PM