X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ian/git?p=subdirmk.git;a=blobdiff_plain;f=regen.mk.in;h=b9625d7bb28954405b31eab152888a45861ab155;hp=a9fd30c06b5e6bd1587ae4f4425dec389345aeba;hb=9699c3f9373ddec95edf58fd7a3b98c302783194;hpb=cf671b1e82db48e7eebe5909d9ae475ed992186a

diff --git a/regen.mk.in b/regen.mk.in
index a9fd30c..b9625d7 100644
--- a/regen.mk.in
+++ b/regen.mk.in
@@ -24,6 +24,9 @@ CONFIG_STATUS	?= config.status
 CONFIGURE_ACS	+= $(CONFIGURE_AC)
 CONFIGURE_ACS	+= subdirmk/subdirmk.ac
 
+# To turn on debugging here, export SUBDIRMK_REGEN_NDEBUG=''
+SUBDIRMK_REGEN_NDEBUG ?= @
+
 $(top_srcdir)/$(CONFIGURE): $(addprefix $(top_srcdir)/,$(CONFIGURE_ACS))
 	cd $(top_srcdir) && autoconf
 
@@ -35,7 +38,9 @@ MAKEFILE_TEMPLATES += $(addprefix $(top_srcdir)/, $(addsuffix .in, \
 	@_SUBDIRMK_MAKEFILES@ \
 	))
 
-main.mk $(SUBDIRMK_MAKEFILES) $(CONFIG_STATUS_OUTPUTS): .makefiles.stamp ;
+main.mk $(SUBDIRMK_MAKEFILES) $(CONFIG_STATUS_OUTPUTS): .makefiles.stamp
+	$(SUBDIRMK_REGEN_NDEBUG): REGEN STAMP CAUSES TARGET=$@
+
 .makefiles.stamp:						\
 		$(top_srcdir)/subdirmk/generate			\
 		$(CONFIG_STATUS)				\
@@ -43,11 +48,12 @@ main.mk $(SUBDIRMK_MAKEFILES) $(CONFIG_STATUS_OUTPUTS): .makefiles.stamp ;
 # This filtering arranges that we can often run config.status to
 # generate only particular output files.  We look for *inputs* that
 # have changed.  If the only inputs that have changed are ones that we
-# know affect only one output (Subdir.mk.in and regen.mk.in), we pass
+# know affect only one output (Subdir.sd.mk and *.mk.in), we pass
 # config.status the corresponding output file names.  Otherwise we
 # pass nothing and config.status does them all.  We need to mention
-# regen.mk.in twice because if $(top_srcdir) is `.', make elides the
+# Subdir.sd.mk twice because if $(top_srcdir) is `.', make elides the
 # directory part from $?.
+	$(SUBDIRMK_REGEN_NDEBUG): REGEN STAMP WANTS DEPS=$?
 	./$(CONFIG_STATUS) $(if					\
 		$(filter-out Subdir.sd.mk %/Subdir.sd.mk	\
 			     %.mk.in				\