build: provide git-head revision via githead.h

We need the git-revision for module-version checks so provide the
infrastructure now and print it in log_init().

Note that the git-describe string is distributed with the tarballs so
end-users will not have to generate it themself. But when building from
git, the revision will be automatically updated whenever something
changes.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
index 0f45cfe..0c9b5b4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -30,6 +30,7 @@ genshader
 genunifont
 src/static_shaders.c
 src/genshader.c
+src/githead.h
 src/text_font_unifont_data.c
 docs/reference/*.txt
 docs/reference/*.bak