version: derive from git tags instead of a hand-bumped constant

VERSION was a constant in the Makefile that had to be bumped by hand and
could silently disagree with the git tag a release was cut from. Derive it
instead, with a committed ./VERSION as the floor and no-git fallback:

  on a tag        v0.2.0            -> 0.2.0
  past a tag      v0.2.0-5-gabc123  -> 0.2.0-5-gabc123   (sorts after 0.2.0)
  before any tag  0.1.0-197-g2d1815 -> ./VERSION + commit count + short id
  no .git at all  0.1.0             -> ./VERSION verbatim (cgit snapshot ->
                                       Homebrew source build)
A dirty tree appends -dirty. The commit count keeps 'brew upgrade' ordering
monotonic before the first tag exists.

version.h now bakes just VERSION (dropping the redundant +GITDESC, which the
derived string already carries). contrib/brew-release reads the base from
./VERSION rather than grepping the Makefile's VERSION line, which is now a
$(shell ...) expression it could not parse.

0 files changed, 0 insertions, 0 deletions