doc: set actual revdate for manpages

manpages expect the date of the last revision, if that is not found
DocBook Stylesheets go through a series of hacks to generate one with
the format `%d/%d/%Y` which is not ideal.

In addition to this format not being standard, different tools generate
dates with different formats.

There's no need for any confusion if we specify the revision date, so
let's do so.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/Makefile b/Documentation/Makefile
index 3133ea31829ec3c1107e6075362d499f1f4a657c..b629176d7d2d6776e0a66fbda466915219f32bc2 100644 (file)
--- a/Documentation/Makefile
+++ b/Documentation/Makefile
@@ -144,13 +144,16 @@ man5dir = $(mandir)/man5
 man7dir = $(mandir)/man7
 # DESTDIR =
 
+GIT_DATE := $(shell git show --quiet --pretty='%as')
+
 ASCIIDOC = asciidoc
 ASCIIDOC_EXTRA =
 ASCIIDOC_HTML = xhtml11
 ASCIIDOC_DOCBOOK = docbook
 ASCIIDOC_CONF = -f asciidoc.conf
 ASCIIDOC_COMMON = $(ASCIIDOC) $(ASCIIDOC_EXTRA) $(ASCIIDOC_CONF) \
-               -amanmanual='Git Manual' -amansource='Git $(GIT_VERSION)'
+               -amanmanual='Git Manual' -amansource='Git $(GIT_VERSION)' \
+               -arevdate='$(GIT_DATE)'
 ASCIIDOC_DEPS = asciidoc.conf GIT-ASCIIDOCFLAGS
 TXT_TO_HTML = $(ASCIIDOC_COMMON) -b $(ASCIIDOC_HTML)
 TXT_TO_XML = $(ASCIIDOC_COMMON) -b $(ASCIIDOC_DOCBOOK)