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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug gcov-profile/100751] __gcov_dump and __gcov_reset usage
Date: Tue, 25 May 2021 07:56:25 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100751

Martin Li=C5=A1ka <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                URL|                            |https://gcc.gnu.org/piperma
                   |                            |il/gcc-patches/2021-May/571
                   |                            |152.html
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2021-05-25
           Assignee|unassigned at gcc dot gnu.org      |marxin at gcc dot g=
nu.org

--- Comment #3 from Martin Li=C5=A1ka <marxin at gcc dot gnu.org> ---
> For the second time and then onwards, __gcov_dump() invocation (by giving
> 'g' character during the a.out run) doesn't happen.

Yes, one can call __gcov_dump only once per run.
>=20
> Another thing is  that, __gcov_reset() also doesn't appear to work. I tri=
ed
> giving the character 'r' during the run of the program but couldn't see t=
he
> counters getting reset to 0 in the sample-prog.gcov file. The previous
> values of lines covered were there.

No, __gcov_reset resets run-time counters (profile collected so far during =
an
application run). If you want to clear profile, then simply remove .gcda fi=
les.

I've just send documentation improvement for it:
https://gcc.gnu.org/pipermail/gcc-patches/2021-May/571152.html=