-v should print also the revision number in repo

[U.Mutlu]

Hi,

currently -v (ie. gcc -v) prints these data:

gcc version 9.0.0 20180613 (experimental) (GCC)

It would be nice, when building from a repository that then the resulting
target should contain also the revision number (for example "r261543")
of the underlying repository, so that gcc -v then prints this info as well.

Maybe the respective revision nbr of the repository used (svn, git, ...),
or perhaps better: a new generic solution with a unique & common rev-nbr
for all repos (and non-repos): a new file with rev-info in the repo-root
could do the trick, IMO...

Thx