Fw: Regarding __gcov_dump and __gcov_reset usage

Martin Liška mliska@suse.cz
Mon May 24 14:02:08 GMT 2021


On 5/24/21 1:44 PM, Gejoe Daniel via Gcc wrote:
> Adding gcc mailing list for the clarification.
> 
> Thank you team ! 
> 
> From: "Gejoe Daniel"<gejoed@rediffmail.com>
> Sent: Mon, 24 May 2021 15:02:12
> To: "gcc-help@gcc.gnu.org"<gcc-help@gcc.gnu.org>
> Subject: Re: Regarding __gcov_dump and __gcov_reset usage
> 
> Hi team,
> 
> Any info/reply ?
> 
> Thanking you in advance,
> Gejoe
> 
> 
> From: "Gejoe Daniel"<gejoed@rediffmail.com>
> Sent: Sun, 16 May 2021 17:37:46
> To: <gcc-help@gcc.gnu.org>
> Subject: Regarding __gcov_dump and __gcov_reset usage
> 
> Hi team,
> 
> I did go through the online manual of gcc gcov  on __gcov_dump() and __gcov_reset() :
> https://gcc.gnu.org/onlinedocs/gcc/Gcov-and-Optimization.html#Gcov-and-Optimization
> 
> I tried out using the functions in a sample program (sample-prog.c) that is attached here.
> 
> The steps followed were :
> 
> (1)  gcc -fprofile-arcs -ftest-coverage sample-prog.c 
> (2)  ./a.out
> (3)  gcov sample-prog.c
> 
> While running a.out, when I give character 'g', the __gcov_dump() must be invoked.
> What I could observe is that first time __gcov_dump() is invoked , the sample-prog.gcda file gets created.
> For the second time and then onwards, __gcov_dump() invocation (by giving 'g' character during the a.out run) doesn't happen.
> This is concluded by looking at the time stamp of sample-prog.gcda file in the same folder. It was still having the same time stamp of first time invocation of __gcov_dump().
> 
> Another thing is  that, __gcov_reset() also doesn't appear to work. I tried giving the character 'r' during the run of the program but couldn't see the counters getting reset to 0 in the sample-prog.gcov file. The previous values of lines covered were there.
> 
> Let me know if my approach is correct or if I miss any information here.
> 
> Thanks,
> Gejoe
>  
> 

Hello.

Can you please create bug at: https://gcc.gnu.org/bugzilla/
Please upload there a test-case and series of commands executed and the expected result.

Thank you,
Martin


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