Thread: Compiler errors.

I have a c file which can be compiled in Linux via GCC , but when I compile it in NetBeans via Cygwin or MinGW , it doesn't work and keeps throwing a segmentation fault.

Any ideas on how to solve this ?

Much thanks.

Try looking into gdb (debugger) and use it to step through your code.
Maybe get traces back to see the behavior of your code.

GDB doesn't produce any errors as it can be compiled in GCC ..

I try to see if there's any errors lurking somewhere....

Hmm maybe my phrasing of the sentence is wrong.. When I run the file in GDB, it simply runs without any errors.

What I Did
gcc -ggdb main.c
gdb ./a.out
<run>

will simply run the file with no errors.

Originally Posted by Krabiki

Hmm maybe my phrasing of the sentence is wrong.. When I run the file in GDB, it simply runs without any errors.

What I Did
gcc -ggdb main.c
gdb ./a.out
<run>

will simply run the file with no errors.

Why not make it easier for someone to assist you by actually posting the code?
When you compile and run the code, does the output actually do what you want it to do?

Where did you allocate memory for that pointer?

Jim

A proper test case may help

Code:

#include <stdio.h>

struct st1 {
    int id;
};
typedef struct st1 ST;

int main(void)
{
    ST da[1000], *ptr[1000];
    int counter, x;
    
    // code...
    // da[] contains the struct variables
    // ptr[] contains the address of the da[] it points to
    const int len = sizeof da / sizeof da[0];
    for (counter = 0; counter < len; counter++) {
        ptr[counter] = &da[counter];
                
//        da[counter].id = 0;
    
        // checking if id in the struct is 0
        x = counter;
        
        if(!(*ptr[x]).id) {   // seg fault in this line
            puts("Not 0");
        }
    }
    return 0;
}

No segfaults here, so I am guessing your counter or x are going out of bounds.

Hmm I think setting the struct int variable id to 0 will solve the issue, but I can't figure out how to do it.

Sample code, working code snippet showing the seg fault at the line in which it checks if struct in variable is 0.

Code:

int x;
int val_id = 1;
int counter;

struct st1 {
    int id;
   };
   typedef struct st1 ST  ;
   ST *ptr[1000], da[1000];
   //ST da[1000]= { .id = 0 };
// code...
// da[] contains the struct variables
// ptr[] contains the address of the da[] it points to  

int main(){

for(counter=0;counter<1000;counter++){
    ptr[counter] = &da[counter];
}


for(x = 0; x<counter; x++) {
     if(!(*ptr[x]).id)
      {   
          // Assign each ptr[x] with id
          (*ptr[x]).id=val_id;
      }
}

// code...

// checking if id in the struct is 0
if(!(*ptr[x]).id)   // seg fault in this line
{
    printf("success\n");

}

return 0;
}