doc: make HTML manual reproducible

Versions of docbook-xsl newer than 1.79.1 allows xsltproc to assign
IDs to nodes in the generated HTML consistently, to make the output
resulting from the same source stable and reproducible.

Pass the generate.consistent.ids parameter from the command line to
ask for this feature.  Older versions of the tool simply ignores the
parameter and produces their output the same way as before this
change, so there is no need to check for toolchain version.

Signed-off-by: Arnout Engelen <arnout@bzzt.net>
Helped-by: brian m. carlson <sandals@crustytoothpaste.net>
Helped-by: Todd Zullinger <tmz@pobox.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/Makefile b/Documentation/Makefile
index 80d1908a44ca38058c58dcc4e3444ee96060757b..69dbe4bb0b78813355a463d5508e8278c26645f5 100644 (file)
--- a/Documentation/Makefile
+++ b/Documentation/Makefile
@@ -380,7 +380,10 @@ SubmittingPatches.txt: SubmittingPatches
        $(QUIET_GEN) cp $< $@
 
 XSLT = docbook.xsl
-XSLTOPTS = --xinclude --stringparam html.stylesheet docbook-xsl.css
+XSLTOPTS =
+XSLTOPTS += --xinclude
+XSLTOPTS += --stringparam html.stylesheet docbook-xsl.css
+XSLTOPTS += --param generate.consistent.ids 1
 
 user-manual.html: user-manual.xml $(XSLT)
        $(QUIET_XSLTPROC)$(RM) $@+ $@ && \