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#include <stdio.h>
#include <stdlib.h>
 
    void first(char **t)
    {
        *t = malloc(5*sizeof(char));
    }
 
    int main(int argc, char * argv[])
    {
        char * t = NULL;
        printf("%p\n", t);
        first(&t);
        printf("%p\n", t);
        return 0;
    }

prog.c: In function 'third':
prog.c:8:9: warning: implicit declaration of function 'strcpy' [-Wimplicit-function-declaration]
         strcpy(*msg, "third");
         ^
prog.c:8:9: warning: incompatible implicit declaration of built-in function 'strcpy'
prog.c:8:9: note: include '<string.h>' or provide a declaration of 'strcpy'
prog.c: In function 'change':
prog.c:15:9: warning: incompatible implicit declaration of built-in function 'strcpy'
         strcpy(*msg, "change");
         ^
prog.c:15:9: note: include '<string.h>' or provide a declaration of 'strcpy'
prog.c: In function 'test':
prog.c:23:9: warning: incompatible implicit declaration of built-in function 'strcpy'
         strcpy(*msg, "test");
         ^
prog.c:23:9: note: include '<string.h>' or provide a declaration of 'strcpy'
prog.c: In function 'main':
prog.c:33:9: warning: implicit declaration of function 'first' [-Wimplicit-function-declaration]
         first(&t);
         ^
/home/Szb08f/cc0dRSv2.o: In function `main':
prog.c:(.text.startup+0x1d): undefined reference to `first'
collect2: error: ld returned 1 exit status

Standard output is empty