# given explicitly on the command line) so mention it first.
all:
-# List all subdirectories here. Each contains its own Makefile.local
-subdirs = compat completion emacs lib
-
-# We make all targets depend on the Makefiles themselves.
-global_deps = Makefile Makefile.local \
- $(subdirs:%=%/Makefile) $(subdirs:%=%/Makefile.local)
-
# Sub-directory Makefile.local fragments can append to these variables
# to have directory-specific cflags as necessary.
extra_cflags :=
extra_cxxflags :=
+# Get settings from the output of configure by running it to generate
+# Makefile.config if it doesn't exist yet.
+
+# If Makefile.config doesn't exist, then srcdir won't be
+# set. Conditionally set it (assuming a plain srcdir build) so that
+# the rule to generate Makefile.config can actually work.
+srcdir ?= .
+
+include Makefile.config
+
+# We make all targets depend on the Makefiles themselves.
+global_deps = Makefile Makefile.config Makefile.local \
+ $(subdirs:%=%/Makefile) $(subdirs:%=%/Makefile.local)
+
+INCLUDE_MORE := yes
+ifneq ($(filter clean distclean dataclean, $(word 1, $(MAKECMDGOALS))),)
+CLEAN_GOAL := $(word 1, $(MAKECMDGOALS))
+
+# If there are more goals following CLEAN_GOAL, run $(MAKE)s in parts.
+ifneq ($(word 2, $(MAKECMDGOALS)),)
+INCLUDE_MORE := no
+FOLLOWING_GOALS := $(wordlist 2, 99, $(MAKECMDGOALS))
+
+.PHONY: $(FOLLOWING_GOALS) make_in_parts
+$(FOLLOWING_GOALS):
+ @true
+$(CLEAN_GOAL): make_in_parts
+make_in_parts:
+ $(MAKE) $(CLEAN_GOAL)
+ $(MAKE) $(FOLLOWING_GOALS) configure_options="$(configure_options)"
+endif
+
+else
+CLEAN_GOAL :=
+endif
+
+# Potentially speedup make clean, distclean and dataclean ; avoid
+# re-creating Makefile.config if it exists but configure is newer.
+ifneq ($(CLEAN_GOAL),)
+Makefile.config: | $(srcdir)/configure
+else
+Makefile.config: $(srcdir)/configure
+endif
+ifeq ($(configure_options),)
+ @echo ""
+ @echo "Note: Calling ./configure with no command-line arguments. This is often fine,"
+ @echo " but if you want to specify any arguments (such as an alternate prefix"
+ @echo " into which to install), call ./configure explicitly and then make again."
+ @echo " See \"./configure --help\" for more details."
+ @echo ""
+endif
+ $(srcdir)/configure $(configure_options)
+
+ifeq ($(INCLUDE_MORE),yes)
+# runtime variable definitions available in all subdirs
+include $(srcdir)/Makefile.global
# Finally, include all of the Makefile.local fragments where all the
# real work is done.
include $(subdirs:%=%/Makefile.local) Makefile.local
+endif