Resync with gnulib.

* GNUmakefile: Grab from upstream, to fix issue where 'make
install' would allow installation of stale version string.

Signed-off-by: Eric Blake <ebb9@byu.net>

1 files changed, 11 insertions, 1 deletions

diff --git a/GNUmakefile b/GNUmakefile
index 31bd873f..0f1bba93 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -55,12 +55,22 @@ _have-git-version-gen := \
 ifeq ($(_have-git-version-gen)0,yes$(MAKELEVEL))
   _is-dist-target = $(filter-out %clean, \
     $(filter maintainer-% dist% alpha beta major,$(MAKECMDGOALS)))
-  ifneq (,$(_is-dist-target))
+  _is-install-target = $(filter-out %check, $(filter install%,$(MAKECMDGOALS)))
+  ifneq (,$(_is-dist-target)$(_is-install-target))
     _curr-ver := $(shell cd $(srcdir) \
                    && $(_build-aux)/git-version-gen .tarball-version)
     ifneq ($(_curr-ver),$(VERSION))
       ifeq ($(_curr-ver),UNKNOWN)
         $(info WARNING: unable to verify if $(VERSION) is correct version)
+      else ifneq (,$(_is-install-target))
+        # GNU Coding Standards state that 'make install' should not cause
+        # recompilation after 'make all'.  But as long as changing the version
+        # string alters config.h, the cost of having 'make all' always have an
+        # up-to-date version is prohibitive.  So, as a compromise, we merely
+        # refuse to install if the version string is out of date; the user
+        # must run 'autoreconf' (or something like 'make distcheck') to
+        # fix the version, 'make all' to propagate it, then 'make install'.
+        $(error version string $(VERSION) is out of date; run autoreconf before installing)
       else
         $(info INFO: running autoreconf for new version string: $(_curr-ver))
         _dummy := $(shell cd $(srcdir) && rm -rf autom4te.cache .version \