Re: [OT] gcc-warning: more info

[Erik Steffl <steffl@bigfoot.com>]

  see below

Erdmut Pfeifer wrote:
> 
> On Wed, Oct 18, 2000 at 11:08:23AM +0200, Daniel Reuter wrote:
> > Hello there,
> >
> > Thanks to all, who responded up to now. I think I'll give some more
> > information, as I still don't understand, why the warning
> > main.c:158: assignment makes pointer from integer without a cast
> > is generated in my case:
> >
> > I have the following (among some other function and structure
> > declarations) in my program-header-file 'bet.h':
> >
> >       #include <stdlib.h>
> >       #include <stdio.h>
> >
> >       struct provided_data{
> >               double sample_weight;
> >               struct datapoint *ppovolads;
> >               int value_count;
> >       };
> >
> >       struct provided_data *read_data(char *);
> >
> >
> > This function is in file 'scanner.c' and does the following:
> >
> >       #include "bet.h"
> >
> >       struct provided_data *read_data(char *input_file_name)
> >       {
> >               struct provided_data *prov_data_buffer;
> >
> >               Read in some data and put them into structure provided_data.
> >               Then return pointer to structure provided data using the
> >               following statement:
> >
> >               return(prov_data_buffer);
> >       }
> >
> >
> > In file main.c I have the following:
> >
> >       #include "bet.h"
> >
> >       int main(int argc, char **argv)
> >       {
> >               some code that reads commandline opts and so on.
> >
> >               Here I define input_data:
> >               struct provided_data *input_data;
> >
> >               Now call read_data:
> > --->          input_data=read_data(input_file_name);

  try:

input_data=(struct provided_data *)read_data(input_file_name);

  then try:

input_data=read_data((char *)input_file_name);

  and finally:

input_data=(struct provided_data *)read_data((char*)input_file_name);

  to figure out which one is the offending integer - it is either return
value (no warning when first line used) or parameter (second line) or
both (third line)... [of course, you can use all three lines at once, no
need to edit/compile for each of them]

  are you sure that the struct provided_data is known?

  try to simplify the code fragment and compile it alone... [without the
rest of you app]

	erik

> >       }
> >
> > line marked with ---> is the line, the compiler complains about.
> > I don't quite understand this, because I never declared function read_data
> > to return an int. Is something wrong with my function declaration?
> 
> sorry, I can't tell you what the problem is -- doesn't seem to be
> in the syntax. My gcc (egcs-2.91.66) doesn't have any problems with
> this code fragment.
> 
> --
> Erdmut Pfeifer
> science+computing gmbh
> 
> -- Bugs come in through open windows. Keep Windows shut! --
> 
> --
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