[project @ 2002-11-19 13:46:26 by simonmar]

Don't recalculate dependencies if none of the source files have
changed.

From: Ian Lynagh <igloo@earth.li>

diff --git a/mk/target.mk b/mk/target.mk
index 2843334..79f0bd9 100644 (file)
--- a/mk/target.mk
+++ b/mk/target.mk
@@ -54,7 +54,7 @@ include $(TOP)/mk/suffix.mk
 #
 # depend:
 #
-#  The depend target has to cope with a set of files that may have
+#  The Depend target has to cope with a set of files that may have
 #  different ways of computing their dependencies, i.e., a Haskell
 #  module's dependencies are computed differently from C files.
 #
@@ -83,17 +83,19 @@ else
 PKGCONF_DEP =
 endif
 
-depend :: $(MKDEPENDHS_SRCS) $(MKDEPENDC_SRCS) $(STAMP_PKG_CONF)
-       @$(RM) .depend
-       @touch .depend
+depend :: .depend
+
+.depend: $(MKDEPENDHS_SRCS) $(MKDEPENDC_SRCS) $(STAMP_PKG_CONF)
+       @$(RM) $@
+       @touch $@
 ifneq "$(DOC_SRCS)" ""
-       $(MKDEPENDLIT) -o .depend $(MKDEPENDLIT_OPTS) $(filter %.lit,$(DOC_SRCS))
+       $(MKDEPENDLIT) -o $@ $(MKDEPENDLIT_OPTS) $(filter %.lit,$(DOC_SRCS))
 endif
 ifneq "$(MKDEPENDC_SRCS)" ""
-       $(MKDEPENDC) -f .depend $(MKDEPENDC_OPTS) $(foreach way,$(WAYS),-s $(way)) -- $(CC_OPTS) -- $(MKDEPENDC_SRCS) 
+       $(MKDEPENDC) -f $@ $(MKDEPENDC_OPTS) $(foreach way,$(WAYS),-s $(way)) -- $(CC_OPTS) -- $(MKDEPENDC_SRCS) 
 endif
 ifneq "$(MKDEPENDHS_SRCS)" ""
-       $(MKDEPENDHS) -M -optdep-f -optdep.depend $(foreach way,$(WAYS),-optdep-s -optdep$(way)) $(foreach obj,$(MKDEPENDHS_OBJ_SUFFICES),-osuf $(obj)) $(MKDEPENDHS_OPTS) $(filter-out -split-objs, $(HC_OPTS)) $(MKDEPENDHS_SRCS)
+       $(MKDEPENDHS) -M -optdep-f -optdep$@ $(foreach way,$(WAYS),-optdep-s -optdep$(way)) $(foreach obj,$(MKDEPENDHS_OBJ_SUFFICES),-osuf $(obj)) $(MKDEPENDHS_OPTS) $(filter-out -split-objs, $(HC_OPTS)) $(MKDEPENDHS_SRCS)
 endif