https://gcc.gnu.org/bugzilla/show_bug.cgi?id=47618
--- Comment #24 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to qinzhao from comment #23)
> (In reply to Andrew Pinski from comment #7)
> > Created attachment 27869 [details]
> > Patch for adding merge-gcda
> >
> > here is the patch which adds merge-gcda . I don't add any testcases as it
> > is currently designed only for how Cavium's Simple-exec works in that each
> > core writes out its own gcda file.
>
> I recently found this bug due to a similar problem. looks like that there
> are two parts of work for this problem:
>
> 1. GCC's new feature to guarantee that all pre-merged files are saved with
> different names for different instances of the same process.
> 2. a merge tool to merge all the gcda files afterwards.
>
> from my understanding, the patch for the above 1 has been committed into
> GCC9.
Yes.
> How about the patch for the above 2? has it been committed?
It has been there for a while, please take a look at:
$ gcov-tool merge --help
merge: unrecognized option '--help'
Merge subcomand usage: merge [options] <dir1> <dir2> Merge coverage
file contents
-o, --output <dir> Output directory
-v, --verbose Verbose mode
-w, --weight <w1,w2> Set weights (float point values)
