[Bug gcov-profile/47618] Collecting multiple profiles and using all for PGO

[qinzhao at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=47618

--- Comment #25 from qinzhao at gcc dot gnu.org ---
(In reply to Martin Liška from comment #24)
> 
> > 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)

two more questions on this merge tool:
1. it can only merge two directories at one time. So, for multiple directories,
for example "n", we have to invoke gcov-tool merge n-1 times in order to merge
all of them?
2. Intel compiler (icc)'s profmerge is able to merge all the .dyn files under
one directory, does gcc have such functionality currently?