Avoid unnecessary recompilation after ./configure (helps #3228)

[ghc-hetmet.git] / Makefile

diff --git a/Makefile b/Makefile
index 273c5c4..0d563df 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -1,3 +1,14 @@
+# -----------------------------------------------------------------------------
+#
+# (c) 2009 The University of Glasgow
+#
+# This file is part of the GHC build system.
+#
+# To understand how the build system works and how to modify it, see
+#      http://hackage.haskell.org/trac/ghc/wiki/Building/Architecture
+#      http://hackage.haskell.org/trac/ghc/wiki/Building/Modifying
+#
+# -----------------------------------------------------------------------------
 
 ifeq "$(wildcard distrib/)" ""
 
@@ -21,42 +32,102 @@ else
 default : all
        @:
 
+# For help, type 'make help'
+.PHONY: help
+help :
+       @cat MAKEHELP
+
+ifneq "$(findstring clean,$(MAKECMDGOALS))" ""
+-include mk/config.mk
+else
+include mk/config.mk
+ifeq "$(ProjectVersion)" ""
+$(error Please run ./configure first)
+endif
+endif
+
+include mk/custom-settings.mk
+
 # No need to update makefiles for these targets:
-REALGOALS=$(filter-out clean clean_% distclean maintainer-clean show,$(MAKECMDGOALS))
+REALGOALS=$(filter-out bootstrapping-files framework-pkg clean clean_% distclean maintainer-clean show help,$(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.
+#
+define check-configure-file
+# $1 = file
+if ! test -f $1.old; then \
+  echo "backing up $1"; \
+  cp $1 $1.old; \
+  touch -r $1 $1.old; \
+else \
+  if test $1 -nt $1.old; then \
+    if cmp $1 $1.old; then \
+       echo "$1 has been touched, but has not changed"; \
+       touch -r $1.old $1; \
+    else \
+       echo "$1 has changed"; \
+       cp $1 $1.old; \
+       touch -r $1 $1.old; \
+    fi \
+  fi \
+fi
+endef
 
 # 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)
 $(REALGOALS) all:
+       @$(call check-configure-file,mk/config.mk)
+       @$(call check-configure-file,mk/project.mk)
+       @$(call check-configure-file,compiler/ghc.cabal)
+
        @echo "===--- updating makefiles phase 0"
        $(MAKE) -r --no-print-directory -f ghc.mk phase=0 just-makefiles
+ifneq "$(OMIT_PHASE_1)" "YES"
        @echo "===--- updating makefiles phase 1"
        $(MAKE) -r --no-print-directory -f ghc.mk phase=1 just-makefiles
+endif
+ifneq "$(OMIT_PHASE_2)" "YES"
        @echo "===--- updating makefiles phase 2"
        $(MAKE) -r --no-print-directory -f ghc.mk phase=2 just-makefiles
+endif
+ifneq "$(OMIT_PHASE_3)" "YES"
        @echo "===--- updating makefiles phase 3"
        $(MAKE) -r --no-print-directory -f ghc.mk phase=3 just-makefiles
+endif
        @echo "===--- finished updating makefiles"
        $(MAKE) -r --no-print-directory -f ghc.mk $@
 
 binary-dist:
+ifeq "$(mingw32_TARGET_OS)" "1"
+       $(MAKE) -r --no-print-directory -f ghc.mk windows-binary-dist
+       $(MAKE) -r --no-print-directory -f ghc.mk windows-installer
+else
        rm -f bindist-list
        $(MAKE) -r --no-print-directory -f ghc.mk bindist BINDIST=YES
        $(MAKE) -r --no-print-directory -f ghc.mk binary-dist
+endif
 
 clean distclean maintainer-clean:
-       $(MAKE) -r --no-print-directory -f ghc.mk $@
+       $(MAKE) -r --no-print-directory -f ghc.mk $@ CLEANING=YES
        test ! -d testsuite || $(MAKE) -C testsuite $@
 
 $(filter clean_%, $(MAKECMDGOALS)) : clean_% :
-       $(MAKE) -r --no-print-directory -f ghc.mk $@
+       $(MAKE) -r --no-print-directory -f ghc.mk $@ CLEANING=YES
 
-show:
+bootstrapping-files show:
        $(MAKE) -r --no-print-directory -f ghc.mk $@
 
+ifeq "$(darwin_TARGET_OS)" "1"
+framework-pkg:
+       $(MAKE) -C distrib/MacOS $@
+endif
+
 # If the user says 'make A B', then we don't want to invoke two
 # instances of the rule above in parallel:
 .NOTPARALLEL:
 
 endif
-