https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100751
--- Comment #23 from Martin Liška <marxin at gcc dot gnu.org> ---
> So, for either a one time call of __gcov_dump (though we may attempt to call
> __gcov_dump many times) or at the exit of the program execution, the merge
> of profile happens due to which __gcov_reset doesn't get reflected at all.
> Am I right ?
Oh, I actually wrongly updated the documentation. When __gcov_reset is called,
run-time counters are reset to zero AND __gcov_dump can be called again (or
profile will be saved at exit).
Slightly modified test-case does now:
$ cat sample-prog.c
#include <stdio.h>
#include <ctype.h>
#include <unistd.h>
extern void __gcov_reset(void);
extern void __gcov_flush(void);
extern void __gcov_dump( void);
int main()
{
unsigned char c;
int count=0;
c = 'g';
do {
printf ("c: '%c'\n", c);
if(c == 'g'){
__gcov_dump();
printf("__gcov_dump() invoked!\n");
c = 'r';
}
else if(c == 'r'){
__gcov_reset();
printf("__gcov_reset() invoked!\n");
c = 'f';
}
if(count == 2)
c = 'g';
else if (count > 10)
c = 'e';
count++;
}while(c != 'e');
return 0;
}
$ gcc sample-prog.c --coverage -g && ./a.out && gcov -t sample-prog.c
c: 'g'
__gcov_dump() invoked!
c: 'r'
__gcov_reset() invoked!
c: 'f'
c: 'g'
__gcov_dump() invoked!
c: 'r'
__gcov_reset() invoked!
c: 'f'
c: 'f'
c: 'f'
c: 'f'
c: 'f'
c: 'f'
c: 'f'
-: 0:Source:sample-prog.c
-: 0:Graph:sample-prog.gcno
-: 0:Data:sample-prog.gcda
-: 0:Runs:1
-: 1:#include <stdio.h>
-: 2:#include <ctype.h>
-: 3:#include <unistd.h>
-: 4:
-: 5:extern void __gcov_reset(void);
-: 6:extern void __gcov_flush(void);
-: 7:extern void __gcov_dump( void);
-: 8:
1: 9:int main()
-: 10:{
-: 11: unsigned char c;
1: 12: int count=0;
1: 13: c = 'g';
-: 14:
-: 15: do {
10: 16: printf ("c: '%c'\n", c);
-: 17:
10: 18: if(c == 'g'){
2: 19: __gcov_dump();
#####: 20: printf("__gcov_dump() invoked!\n");
#####: 21: c = 'r';
-: 22: }
8: 23: else if(c == 'r'){
#####: 24: __gcov_reset();
2: 25: printf("__gcov_reset() invoked!\n");
2: 26: c = 'f';
-: 27: }
10: 28: if(count == 2)
1: 29: c = 'g';
9: 30: else if (count > 10)
1: 31: c = 'e';
10: 32: count++;
10: 33: }while(c != 'e');
-: 34:
1: 35: return 0;
-: 36:}
Which should be correct in my oppinion.
