X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=Makefile;h=4e5fcbb002324a4042204fdd68b87263ec0f8a0d;hb=4fa44a3ae9c36222ccb460ba3ed24e46bf7c70ae;hp=f51b9a8f7e1026d021a179d9bce785e584d50031;hpb=de4cc55e97ca2011ab3889a9e2dab9a745839a66;p=ghc-hetmet.git

diff --git a/Makefile b/Makefile
index f51b9a8..4e5fcbb 100644
--- a/Makefile
+++ b/Makefile
@@ -19,19 +19,20 @@ default:
 	@echo 'Run "make install" to install'
 	@false
 
-.PHONY: install
-install:
-	$(MAKE) -r --no-print-directory -f ghc.mk install BINDIST=YES NO_INCLUDE_DEPS=YES
-
-.PHONY: show
-show:
-	$(MAKE) -r --no-print-directory -f ghc.mk $@
+.PHONY: install show
+install show:
+	$(MAKE) -r --no-print-directory -f ghc.mk $@ BINDIST=YES NO_INCLUDE_DEPS=YES
 
 else
 
 default : all
 	@:
 
+# For help, type 'make help'
+.PHONY: help
+help :
+	@cat MAKEHELP
+
 ifneq "$(findstring clean,$(MAKECMDGOALS))" ""
 -include mk/config.mk
 else
@@ -44,12 +45,21 @@ endif
 include mk/custom-settings.mk
 
 # No need to update makefiles for these targets:
-REALGOALS=$(filter-out bootstrapping-files framework-pkg clean clean_% distclean maintainer-clean show,$(MAKECMDGOALS))
+REALGOALS=$(filter-out binary-dist bootstrapping-files framework-pkg clean clean_% distclean maintainer-clean show help,$(MAKECMDGOALS))
+
+# configure touches certain files even if they haven't changed.  This
+# can mean a lot of unnecessary recompilation after a re-configure, so
+# here we cache the old versions of these files so we can restore the
+# timestamps.
+%.old:  %
+	@set -x && test -f $@ && cmp -s $< $@ || cp -p $< $@
+	touch -r $@ $<
+
 
 # NB. not the same as saying '%: ...', which doesn't do the right thing:
 # it does nothing if we specify a target that already exists.
 .PHONY: $(REALGOALS)
-$(REALGOALS) all:
+$(REALGOALS) all: mk/config.mk.old mk/project.mk.old compiler/ghc.cabal.old
 	@echo "===--- updating makefiles phase 0"
 	$(MAKE) -r --no-print-directory -f ghc.mk phase=0 just-makefiles
 ifneq "$(OMIT_PHASE_1)" "YES"