[nongnu] elpa/with-editor 1380f7c488 1/2: make: Re-generate %.texi if HEAD changed since previous run

[ELPA Syncer]

branch: elpa/with-editor
commit 1380f7c4887e4f956a648baa33d4e05c419169ce
Author: Jonas Bernoulli <jonas@bernoul.li>
Commit: Jonas Bernoulli <jonas@bernoul.li>

    make: Re-generate %.texi if HEAD changed since previous run
---
 .gitignore    | 1 +
 default.mk    | 1 +
 docs/Makefile | 6 +++++-
 3 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/.gitignore b/.gitignore
index d9f1c87d2a..c2ac7de58b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,6 +3,7 @@
 /docs/*.info
 /docs/*.pdf
 /docs/*.texi
+/docs/.revdesc
 /docs/dir
 /docs/stats/
 /lisp/*-autoloads.el
diff --git a/default.mk b/default.mk
index f152f45afd..0577715daf 100644
--- a/default.mk
+++ b/default.mk
@@ -12,6 +12,7 @@ DOMAIN      ?= magit.vc
 CFRONT_DIST ?= E2LUHBKU1FBV02
 
 VERSION ?= $(shell test -e $(TOP).git && git describe --tags --abbrev=0 | cut 
-c2-)
+REVDESC := $(shell test -e $(TOP).git && git describe --tags)
 
 EMACS      ?= emacs
 EMACS_ARGS ?=
diff --git a/docs/Makefile b/docs/Makefile
index 7a39da8682..4285014e48 100644
--- a/docs/Makefile
+++ b/docs/Makefile
@@ -18,7 +18,11 @@ redo-docs:
        @touch $(PKG).org
        @make docs
 
-%.texi: %.org
+.revdesc: ;
+_    := $(shell test "$(REVDESC)" = "$$(cat .revdesc 2> /dev/null)" ||\
+        echo "$(REVDESC)" > .revdesc)
+
+%.texi: %.org .revdesc
        @printf "Generating $@\n"
        @$(EMACS) $(ORG_ARGS) $< $(ORG_EVAL)