Always run recipe if deps are empty

While this may lead to unnecessary runs, it is better than never
running the recipe when the deps are empty, which is the current
behaviour.

diff --git a/GNUmakefile b/GNUmakefile
index a470b399c061894dec66c3db024483efbf995eb6..130312c188d17bb7c7fb8311be09493240f8a72b 100644 (file)
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -181,7 +181,7 @@ override ensuredirectory = if $(TEST) ! -d $(call quote,$1); then $(MKDIR) -p $(
 
 # (callable) Test to see if the dependencies provided by the second argument matches the value in the file corresponding to the first argument in `$(BUILDDIR)/lastprereqs´.
 # If not, return the third argument, plus an additional rule to save the new prerequisites.
-override makeandsavedeps = $(if $(subst $(shell $(CAT) $(call quote,$(BUILDDIR)/lastdeps/$1) 2> /dev/null || true),,$2),$3$(newline)$(silent)$(call ensuredirectory,$(BUILDDIR)/lastdeps)$(newline)$(silent)$(PRINTF) '%s\n' $(call quote,$2) > $(BUILDDIR)/lastdeps/$1,)
+override makeandsavedeps = $(if $(or $(if $2,,1),$(subst $(shell $(CAT) $(call quote,$(BUILDDIR)/lastdeps/$1) 2> /dev/null || true),,$2)),$3$(newline)$(silent)$(call ensuredirectory,$(BUILDDIR)/lastdeps)$(newline)$(silent)$(PRINTF) '%s\n' $(call quote,$2) > $(BUILDDIR)/lastdeps/$1,)
 
 # (callable) Make the catalog for the provided category.
 override define makecategorycatalog