[Bug gcov-profile/67097] gcov-tool merge (can) crash when dir2 contains files not in dir1

[gilles.gouaillardet at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67097

--- Comment #6 from Gilles Gouaillardet <gilles.gouaillardet at gmail dot com> ---
as a side note, would you be interested in me providing a patch so
gcov-tool merge
can merge n directories (currently, we are limited to n=2) ?

i would implement that via a binary tree, so under the hood, that would require
o(log(n)) elementary merge of two directories.

for extreme merge, i can also add an option that specifies the temporary
directory to be used (e.g. something different that /tmp/$TMPDIR)