If working out of a custom git tree that lacks annotated tags, the
'git describe' operation spews "fatal: cannot describe" errors all
over the place.  So add some fallback code in case the best naming
was unable to locate something useful.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

Use the new "git <subcmd>" syntax instead of the deprecated
"git-<subcmd>".

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

Change the automatic local version to have the form -nnnnn-gSHA1SUMID,
where 'nnnnn' is the number of commits since the last tag (i.e.,
1.3.2-rc3).  This makes it much easier to recognize "newer" versions
and to see how much has been changed since the referenced tag.

Stolen from Linux kernel's scripts/setlocalversio, see commit d882421f.

Signed-off-by: Wolfgang Denk <wd@denx.de>

As done in the linux kernel, the U-Boot version (U_BOOT_VERSION)
of all unreleased (untagged) U-Boot images will be automatically
extended upon compiletime with a part of the GIT commit ID and
possibly with "dirty" if uncommited changes are detected.

Here an example for the resulting version:
"U-Boot 1.1.4-g3457ac18-dirty"

The version is now maintained in the toplevel Makefile and the
version headers are autogenerated.

Patch by Stefan Roese, 9 Feb 2006