Avoid systematic doc POs rebuilding

This should avoid translated docs always being outdated when making
web on non-fresh builds.

diff --git a/Documentation/po/GNUmakefile b/Documentation/po/GNUmakefile
index 19b27e23be23468633e8f10dca501f698bf57cc1..4542740e1d21e3a45bcf10eb4c22a9e385071ab8 100644 (file)
--- a/Documentation/po/GNUmakefile
+++ b/Documentation/po/GNUmakefile
@@ -11,11 +11,14 @@ DOC_PO_SOURCES = add_html_footer.py texi-gettext.py
 TELY_FILES = $(shell ls $(depth)/Documentation/user/lilypond*.tely)
 TELY_FILES += $(foreach l, $(LANGS), $(shell ls $(depth)/Documentation/$(l)/user/lilypond*.tely))
 
-messages: $(MO_FILES)
+messages: $(outdir)/messages
+
+$(outdir)/messages: $(MO_FILES)
        for i in $(CATALOGS); do \
          mkdir -p $(doc-localedir)/$$i/LC_MESSAGES; \
          cp $(outdir)/$$i.mo $(doc-localedir)/$$i/LC_MESSAGES/$(DOMAIN).mo; \
        done
+       touch $@
 
 po-update:
        $(PYTHON) $(buildscript-dir)/texi-langutils.py -d $(outdir) -o texi.pot --gettext $(TELY_FILES:%.tely=../%.tely)