a C++ problem

Im use gcc 2.95.3, and compiling some gnu sources I get this error:

debug.c: In method `void CDebugLog::log(const char *, ...)':
debug.c:206: ANSI C++ forbids implicit conversion from `void *' in argument passing

this line have:

vfprintf( m_debugFile, format, args );


can someone help me please?


regards

ps: excuse my ignorance ;)

[Drake1009]

I don't know what the error is, but I recall a lot of documentation for various programs under Linux warning you against using a certain version of gcc and above since they claim there are errors in these.

[§ane]

/*
We really need to see more of your code, exactly which line is failing?

vfprintf( m_debugFile, format, args ); // what relation does this have to CDebugLog::log()?

Possibly one of your arguments to log() are type void* and log() requires a pointer to const char

This is an example of using vprintf() to output a variable list of parameters to the stdout, it should work equally well for vfprintf()
*/

#include <stdio.h>
#include <stdarg.h>

void examplelog(const char *string, ...)
{
va_list arg_ptr;

va_start(arg_ptr, string);

vprintf(string, arg_ptr);

va_end(arg_ptr);
}

void main(void)
{
const char firststring[] = "I liek";
const char secondstring[] = "milk";

examplelog("%s %s!!\n", firststring, secondstring);
}

This is the entire function from debug.c:

/**
* Show a tracing string (line 175
*/
void CDebugLog::log( const char *format, ...)
{
if ( !m_tracingEnabled )
{
return;
}

if ( m_debugFile == NULL )
{
return;
}

/* Wait until we can safely write. */
m_mutex->lock();

if ( m_timeStamping )
{
printTimeStamp();
}

va_list args;
va_start(args, format);

pthread_t self = pthread_self();

/* Write the thread ID first.. */
fprintf( m_debugFile, "%d ", (int)self );

/* Then the message. */
vfprintf( m_debugFile, format, args );

/* Flush the logfile. */
fflush( m_debugFile );
va_end(args);

/* Release our mutex. */
m_mutex->unlock();
}


if I change vfprintf() to vprintf() the error was:

debug.c: In method `void CDebugLog::log(const char *, ...)':
debug.c:206: passing `FILE *' as argument 1 of `vprintf(const char *, char *)'

...¿?...


regards

ps: Drake1009: I dont understand very well, my english is not good, you have docs about solves to linux srcs means?...

[§ane]

Well the problem lies elsewhere, not in that function. It's just that it is having trouble interpreting one of the parameters passed to it, CDebugLog::log(), I am referring to.

Also you should not be touching "debug.c" as I believe this is a GNU helper library and not specifically code from the program you are trying to compile.

You must look through your application's source for the offending call to CDebugLog::log(), this may require tracing it back a few function calls to figure out why a void pointer is being passed to it.

Well..well... I fix the problem with a single line: #include <g++/iostdio.h> :-)


regards & thx ;)

[Minuous]

That's not a C problem, it's a C++ problem...

[andreas]

Just try to REMOVE the -ansi option from the gcc command line, probably in your makefile.
It might work then.

Ok,, thx for your answer :)