1 files changed, 52 insertions, 0 deletions
diff --git a/build-helpers/package-version.mk b/build-helpers/package-version.mk
new file mode 100644
index 0000000..126628e
--- /dev/null
+++ b/build-helpers/package-version.mk
@@ -0,0 +1,52 @@
+BUILD_SCRIPT_DIR = build-helpers
+
+# Check that package version matches git version before creating dist tarballs
+dist-hook: git-version-check git-version-stamp
+distcheck-hook: git-version-check
+
+# Note: We cannot run autogen.sh from here, because we would need some way to
+#       restart the whole dist process from the start and there is none.
+# FIXME: NEWS check uses ${foo%%-*} POSIX shell, tested
+#        with bash, dash, busybox.
+EXTRA_DIST += $(top_srcdir)/$(BUILD_SCRIPT_DIR)/package-version
+git-version-check:
+	@git_ver=`$(top_srcdir)/$(BUILD_SCRIPT_DIR)/package-version $(top_srcdir) version-stamp`; \
+	if test "x$${git_ver}" = "x$(PACKAGE_VERSION)"; then :; else \
+		echo "ERROR: PACKAGE_VERSION and 'git describe' version do not match:"; \
+		echo "         current 'git describe' version: $${git_ver}"; \
+		echo "         current PACKAGE_VERSION:        $(PACKAGE_VERSION)"; \
+		rm -rf "$(top_srcdir)/autom4te.cache"; \
+		if test -f "$(top_srcdir)/autogen.sh"; then \
+			echo "Update PACKAGE_VERSION by running $(top_srcdir)/autogen.sh."; \
+		else \
+			echo "Update PACKAGE_VERSION by running autoreconf(1)."; \
+		fi; \
+		exit 1; \
+	fi; \
+	case `sed 15q $(top_srcdir)/NEWS` in \
+	*"$${git_ver%%-*}"*) : ;; \
+	*) \
+	  echo "NEWS not updated for version $${git_ver%%-*}; not releasing" 1>&2; \
+	  exit 1;; \
+	esac
+
+# Version stamp files can only exist in tarball source trees.
+#
+# So there is no need to generate them anywhere else or to clean them
+# up anywhere.
+git-version-stamp:
+	echo "$(PACKAGE_VERSION)" > "$(distdir)/version-stamp"
+
+# Update *.h file to contain up-to-date version number
+A_V = package-version-internal
+CLEANFILES    += $(A_V).h
+BUILT_SOURCES += $(A_V).h.stamp
+$(A_V).h.stamp:
+	@current_ver=`$(SHELL) $(top_srcdir)/$(BUILD_SCRIPT_DIR)/package-version $(top_srcdir) version-stamp`; \
+	{ echo '#ifndef PACKAGE_VERSION_INTERNAL_H'; \
+	  echo "#define PACKAGE_VERSION_INTERNAL \"$${current_ver}\""; \
+	  echo "#endif /* !PACKAGE_VERSION_INTERNAL */"; } > "$(A_V).h.new"
+	@if test -f "$(A_V).h" \
+	&& cmp "$(A_V).h.new" "$(A_V).h"; then :; \
+	else cat "$(A_V).h.new" > "$(A_V).h"; fi; \
+	rm -f "$(A_V).h.new"