https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100751
--- Comment #21 from Gejoe <gejoed at rediffmail dot com> ---
(In reply to Martin Liška from comment #20)
> > I'm trying to understand line #22 to #26 specifically of .c.gcov file(as
> > shown in commment #16. Let me know if the steps followed in compilation or
> > execution had any thing wrong.
>
> What is wrong with that? What values are expected?
Actually if we look at line #22 should have the value 16 (after a.out run) and
line #24,25 should have values 4 each instead of what is actually present there
in comment#16.Instead the value of 16,4,4 are shown for line # 24,26,27
respectively. That was my query.
Is that because of some difference with source files and .gcda files as shown
there (in .c.gcov file in Comment #16) as follows ?
0:Source is newer than graph
I did delete the gcda file and did the same compilation steps again :
$ gcc -v -save-temps -fprofile-arcs -ftest-coverage sample-prog.c
$ gcc -fprofile-arcs -ftest-coverage sample-prog.o
$./a.out
The output was :
$ ./a.out
__gcov_dump() invoked!
__gcov_reset() invoked!
__gcov_dump() invoked!
__gcov_reset() invoked!
The sample-prog.c.gcov file contents now look fine :
-: 0:Source:sample-prog.c
-: 0:Graph:sample-prog.gcno
-: 0:Data:sample-prog.gcda
-: 0:Runs:1
-: 0:Programs: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 {
-: 16:
10: 17: if(c == 'g'){
2: 18: __gcov_dump();
#####: 19: printf("__gcov_dump() invoked!\n");
#####: 20: c = 'r';
-: 21: }
8: 22: else if(c == 'r'){
#####: 23: __gcov_reset();
2: 24: printf("__gcov_reset() invoked!\n");
2: 25: c = 'f';
-: 26: }
10: 27: if(count == 2)
1: 28: c = 'g';
9: 29: else if (count > 10)
1: 30: c = 'e';
10: 31: count++;
10: 32: }while(c != 'e');
-: 33:
1: 34: return 0;
-: 35:}
==========================================================
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 ?
Thanks again!
