X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=mk%2Ftarget.mk;h=353bdd04bd5f169ca90eec2b25968340ff03b085;hb=4f0e92bcf620776077d167598e93159e14c41276;hp=5e8d60f06083a9720df59a8921ab365dc6d244cd;hpb=9f3b6ad3eb33cf1a0e9036d2ef9d78ac47a18973;p=ghc-hetmet.git

diff --git a/mk/target.mk b/mk/target.mk
index 5e8d60f..353bdd0 100644
--- a/mk/target.mk
+++ b/mk/target.mk
@@ -16,6 +16,7 @@
 # 2.  GNU standard targets
 #	all*
 #	install* uninstall installcheck installdirs
+#       install-docs*
 #	clean* distclean* mostlyclean* maintainer-clean*
 #	tags*
 #	dvi ps (no info) FPTOOLS adds: pdf rtf html
@@ -32,90 +33,16 @@
 # 
 #
 
-
-##################################################################
-#
-# 		Recursive stuff
-#
-# At the top of the file so that recursive makes happen before
-# makes in the main directory. This is needed for some targets,
-# e.g. when building DLLs in hslibs.
-#
 ##################################################################
+# Pre-compute the list of sources so we don't have to do this 
+# multiple times.  See paths.mk.
 
-# Here are the diabolically clever rules that
-# 
-# (a) for each "recursive target" <t>
-#     propagates "make <t>" to directories in SUBDIRS
-#
-# (b) when SUBDIRS is empty,
-#     for each "multi-way-target" <t>
-#     calls "make way=w <t>" for each w in $(WAYS)
-#
-#     This has the effect of making the standard target
-#     in each of the specified ways (as well as in the normal way
+PRE_SRCS := $(ALL_SRCS)
 
-# Controlling variables
-#	WAYS    = extra (beyond the normal way) ways to build things in
-# 	SUBDIRS = subdirectories to recurse into
-
-# No ways, so iterate over the SUBDIRS
-
-# note about recursively invoking make: we'd like make to drop all the
-# way back to the top level if it fails in any of the
-# sub(sub-...)directories.  This is done by setting the -e flag to the
-# shell during the loop, which causes an immediate failure if any of
-# the shell commands fail.
-
-# One exception: if the user gave the -i or -k flag to make in the
-# first place, we'd like to reverse this behaviour.  So we check for
-# these flags, and set the -e flag appropriately.  NOTE: watch out for
-# the --no-print-directory flag which is passed to recursive
-# invocations of make.
-#
-# NOTE: Truly weird use of exit below to stop the for loop dead in
-# its tracks should any of the sub-makes fail. By my reckoning, 
-#  "cmd || exit $?" should be equivalent to "cmd"
-
-ifneq "$(SUBDIRS)" ""
-
-# we override the boot & all targets in the top level Makefile
-ifneq "$(NO_ALL_TARGETS)" "YES"
-ALL_TARGET     = all
-BOOT_TARGET    = boot
-INSTALL_TARGET = install
-endif
-
-$(ALL_TARGET) docs runtests $(BOOT_TARGET) TAGS clean distclean mostlyclean maintainer-clean $(INSTALL_TARGET) html ps dvi txt::
-	@echo "------------------------------------------------------------------------"
-	@echo "===fptools== Recursively making \`$@' in $(SUBDIRS) ..."
-	@echo "PWD = $(shell pwd)"
-	@echo "------------------------------------------------------------------------"
-# Don't rely on -e working, instead we check exit return codes from sub-makes.
-	@case '${MFLAGS}' in *-[ik]*) x_on_err=0;; *-r*[ik]*) x_on_err=0;; *) x_on_err=1;; esac; \
-	for i in $(SUBDIRS); do \
-	  echo "------------------------------------------------------------------------"; \
-	  echo "==fptools== $(MAKE) $@ $(MFLAGS);"; \
-	  echo " in $(shell pwd)/$$i"; \
-	  echo "------------------------------------------------------------------------"; \
-	  $(MAKE) --no-print-directory -C $$i $(MFLAGS) $@; \
-	  if [ $$? -eq 0 -o $$x_on_err -eq 0 ] ;  then true; else exit 1; fi; \
-	done
-	@echo "------------------------------------------------------------------------"
-	@echo "===fptools== Finished making \`$@' in $(SUBDIRS) ..."
-	@echo "PWD = $(shell pwd)"
-	@echo "------------------------------------------------------------------------"
+##################################################################
+# Include package building machinery
 
-endif
-
-#
-# Selectively building subdirectories.
-#
-#
-ifneq "$(SUBDIRS)" ""
-$(SUBDIRS) ::
-	  $(MAKE) -C $@ $(MFLAGS)
-endif
+include $(TOP)/mk/package.mk
 
 ##################################################################
 # 		FPtools standard targets
@@ -155,7 +82,7 @@ ifneq "$(MKDEPENDC_SRCS)" ""
 	$(MKDEPENDC) -f .depend $(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) $(HC_OPTS) $(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)
 endif
 
 
@@ -165,8 +92,12 @@ endif
 #  The boot target, at a minimum generates dependency information
 
 .PHONY: boot
-boot :: depend
 
+ifeq "$(NO_BOOT_TARGET)" "YES"
+boot ::
+else
+boot :: depend
+endif
 
 ##################################################################
 # 		GNU Standard targets
@@ -297,23 +228,12 @@ ifneq "$(BootingFromHc)" "YES"
 $(HS_PROG) :: $(HS_OBJS)
 	$(HC) -o $@ $(HC_OPTS) $(LD_OPTS) $(HS_OBJS)
 else
-# see bootstrp.mk
+# see bootstrap.mk
 $(HS_PROG) :: $(HS_OBJS)
 	$(CC) -o $@ $(HC_BOOT_CC_OPTS) $(HC_BOOT_LD_OPTS) $(HS_OBJS) $(HC_BOOT_LIBS)
 endif
-endif
-
-# Object and interface files have suffixes tagged with their ways
-ifneq "$(way)" ""
-SRC_HC_OPTS += -hisuf $(way_)hi -hcsuf $(way_)hc -osuf $(way_)o
-endif
 
-# add syslib dependencies and current package name
-SRC_HC_OPTS += $(patsubst %, -package %, $(PACKAGE_DEPS))
-ifneq "$(PACKAGE)" ""
-SRC_HC_OPTS += -package-name $(PACKAGE)
-else
-# No library, we are actually building the tools
+# for building a Haskell program, we add FptoolsHcOpts
 SRC_HC_OPTS += $(FptoolsHcOpts)
 endif
 
@@ -327,63 +247,10 @@ $(C_PROG) :: $(C_OBJS)
 	$(CC) -o $@ $(CC_OPTS) $(LD_OPTS) $(C_OBJS) $(LIBS)
 endif
 
-
-#----------------------------------------
-#	Building HsLibs libraries.
-#
-# Inputs:
-#   $(PACKAGE) is the name of the library to build
-#   $(IS_CBITS_LIB) should be "YES" for a "cbits" library
-#
-# Outputs:
-#   $(LIBRARY)		the name of the library.a
-#   $(GHIC_LIBRARY)	the name of the library.o (for GHCi)
-#   $(LIBOBJS)		objects to put in library
-#   $(STUBOBJS)		more objects to put in library
-# 
-# $(LIBOBJS) is set to $(HS_OBJS) or $(C_OBJS) depending
-# on whether or not it's a "cbits" library.  But you can
-# override this by setting $(LIBOBJS) yourself
-
-ifneq "$(PACKAGE)" ""
-
-ifeq "$(IS_CBITS_LIB)" "YES"
-_cbits := _cbits
-STUBOBJS += $(HSC_C_OBJS)
-# Add _hsc.c files to the cbits library
-SRCS       += $(wildcard ../*_hsc.c)
-endif
-
-LIBRARY      = libHS$(PACKAGE)$(_cbits)$(_way).a
-GHCI_LIBRARY = HS$(PACKAGE)$(_cbits)$(_way).o
-
-ifneq "$(IS_CBITS_LIB)" "YES"
-WAYS=$(GhcLibWays)
-endif
-
-ifeq "$(LIBOBJS)" ""
-  ifeq "$(IS_CBITS_LIB)" "YES"
-  LIBOBJS = $(C_OBJS)
-  else
-  LIBOBJS = $(HS_OBJS)
-  endif
-endif
-
-SRC_CC_OPTS += -I$(GHC_INCLUDE_DIR) -I$(GHC_RUNTIME_DIR)
-
-ifeq "$(IS_CBITS_LIB)" "YES"
-override datadir:=$(libdir)/includes
-INSTALL_DATAS += Hs$(shell perl -e 'print ucfirst "$(PACKAGE)"').h
-else
-SRC_CC_OPTS += -Icbits
-endif
-
-endif # PACKAGE
-
 #----------------------------------------
 #	Libraries/archives
 #
-# Build $(LIBRARY) from $(LIBOJBS)+$(STUBOBJS)
+# Build $(LIBRARY) from $(LIBOBJS)+$(STUBOBJS)
 #
 # Inputs:
 #   $(LIBOBJS)
@@ -395,11 +262,18 @@ endif # PACKAGE
 ifneq "$(LIBRARY)" ""
 all :: $(LIBRARY)
 
+ifneq "$(way)" "i"
 define BUILD_LIB
 $(RM) $@
 $(AR) $(AR_OPTS) $@ $(STUBOBJS) $(LIBOBJS)
 $(RANLIB) $@
 endef
+else
+define BUILD_LIB
+$(RM) $@
+al -out:$@ $(STUBOBJS) $(LIBOBJS)
+endef
+endif
 
 #
 # For Haskell object files, we might have chosen to split
@@ -416,19 +290,35 @@ ifneq "$(way)" "u"
 
 SRC_HC_OPTS += -split-objs
 
+# We generate the archive into a temporary file libfoo.a.tmp, then
+# rename it at the end.  This avoids the problem that ar may sometimes
+# fail, leaving a partially built archive behind.
+ifeq "$(ArSupportsInput)" ""
 define BUILD_LIB
-$(RM) $@
-(echo $(STUBOBJS); $(FIND) $(patsubst %.$(way_)o,%,$(LIBOBJS)) -name '*.$(way_)o') | xargs ar q $@
-$(RANLIB) $@
+$(RM) $@ $@.tmp
+(echo $(STUBOBJS); $(FIND) $(patsubst %.$(way_)o,%_split,$(HS_OBJS)) -name '*.$(way_)o') | xargs ar q $@.tmp
+$(RANLIB) $@.tmp
+$(MV) $@.tmp $@
+endef
+else
+define BUILD_LIB
+$(RM) $@ $@.tmp
+echo $(STUBOBJS) > $@.list
+$(FIND) $(patsubst %.$(way_)o,%_split,$(HS_OBJS)) -name '*.$(way_)o' >> $@.list
+$(AR) $(AR_OPTS) $@.tmp $(ArSupportsInput) $@.list
+$(RM) $@.list
+$(RANLIB) $@.tmp
+$(MV) $@.tmp $@
 endef
+endif
 
 # Extra stuff for compiling Haskell files with $(SplitObjs):
 
 HC_SPLIT_PRE = \
-    $(RM) $@; if [ ! -d $(basename $@) ]; then mkdir $(basename $@); else \
-    $(FIND) $(basename $@) -name '*.$(way_)o' | xargs $(RM) __rm_food; fi
+    $(RM) $@; if [ ! -d $(basename $@)_split ]; then mkdir $(basename $@)_split; else \
+    $(FIND) $(basename $@)_split -name '*.$(way_)o' | xargs $(RM) __rm_food; fi
 ifeq "$(GhcWithInterpreter)" "YES"
-HC_SPLIT_POST = ld -r -x -o $@ $(basename $@)/*.$(way_)o
+HC_SPLIT_POST = $(LD) -r $(LD_X) -o $@ $(basename $@)_split/*.$(way_)o
 else
 HC_SPLIT_POST = touch $@
 endif # GhcWithInterpreter == YES
@@ -443,8 +333,8 @@ SRC_HC_POST_OPTS += $(HC_SPLIT_POST);
 #
 
 extraclean ::
-	$(FIND) $(patsubst %.$(way_)o,%,$(HS_OBJS)) -name '*.$(way_)o' -print | xargs $(RM) __rm_food
-	-rmdir $(patsubst %.$(way_)o,%,$(HS_OBJS)) > /dev/null 2>&1
+	$(FIND) $(patsubst %.$(way_)o,%_split,$(HS_OBJS)) -name '*.$(way_)o' -print | xargs $(RM) __rm_food
+	-rmdir $(patsubst %.$(way_)o,%_split,$(HS_OBJS)) > /dev/null 2>&1
 
 endif # $(way) == u
 endif # $(SplitObjs)
@@ -457,74 +347,32 @@ endif # $(HS_SRCS)
 ifeq "$(StripLibraries)" "YES"
 ifeq "$(SplitObjs)" "YES"
 SRC_HC_POST_OPTS += \
-  for i in $(basename $@)/*; do \
-	ld -r -x -o $$i.tmp $$i; \
+  for i in $(basename $@)_split/*; do \
+	$(LD) -r $(LD_X) -o $$i.tmp $$i; \
 	$(MV) $$i.tmp $$i; \
   done
 else
 SRC_HC_POST_OPTS += \
-  ld -r -x -o $@.tmp $@; $(MV) $@.tmp $@
+  $(LD) -r $(LD_X) -o $@.tmp $@; $(MV) $@.tmp $@
 endif # SplitObjs
 endif # StripLibraries
 
-$(LIBRARY) :: $(STUBOBJS) $(LIBOBJS)
+$(LIBRARY) : $(STUBOBJS) $(LIBOBJS)
 	$(BUILD_LIB)
 endif # LIBRARY = ""
 
-#--------------------------------------------------------------
-#	Build dynamically-linkable libraries for GHCi
-#
-# Build $(GHCI_LIBRARY) from $(LIBOBJS)+$(STUBOBJS)
-#
-# Why?  GHCi can only link .o files (at the moment), not .a files
-# so we have to build libFoo.o as well as libFoo.a
-#
-# Furthermore, GHCi currently never loads 
-# profiling libraries (or other non-std ways)
-#
-# Inputs:
-#   $(GHCI_LIBRARY)
-#
-# Outputs:
-#   Rule to build $(GHCI_LIBRARY)
-
-
-ifneq "$(GHCI_LIBRARY)" ""
-ifeq "$(way)" ""
-ifeq "$(GhcWithInterpreter)" "YES"
-
-
-INSTALL_LIBS += $(GHCI_LIBRARY)
-CLEAN_FILES += $(GHCI_LIBRARY)
-
-all :: $(GHCI_LIBRARY)
-
-ifneq "$(GHCI_LIBRARY)" "HSstd.o"
-# An annoying gotcha is that the Prelude is a bit special,
-# for reasons described in ghc/lib/std/Makefile.
-# So we only put in this standard rule for packages other than std
-# The rule for the Prelude is in ghc/lib/std/Makefile
-# We check for GHCI_LIBRARY being HSstd.o rather than
-# PACKAGE being std, because we want to still use the boilerplate rule 
-# for cbits.
-$(GHCI_LIBRARY) :: $(LIBOBJS)
-	ld -r -x -o $@ $(LIBOBJS) $(STUBOBJS)
-endif
-
-endif # GhcWithInterpreter
-endif # way
-endif # GHCI_LIBRARY
-
-
 #----------------------------------------
 #	Building Win32 DLLs
 #
 
 ifeq "$(DLLized)" "YES"
+SRC_CC_OPTS += -DDLLized
 
 ifneq "$(PACKAGE)" ""
 
 SRC_BLD_DLL_OPTS += --export-all --output-def=HS$(PACKAGE)$(_cbits)$(_way).def DllVersionInfo.$(way_)o
+
+ifneq "$(PACKAGE) $(IS_CBITS_LIB)" "std YES"
 ifneq "$(PACKAGE)" "rts"
 SRC_BLD_DLL_OPTS += -lHSstd_cbits_imp -L$(GHC_LIB_DIR)/std/cbits
 SRC_BLD_DLL_OPTS += -lHSrts_$(way_)imp -L$(GHC_RUNTIME_DIR)
@@ -534,6 +382,8 @@ ifneq "$(PACKAGE)" "std"
   endif
 endif
 endif
+endif
+
 SRC_BLD_DLL_OPTS += -lgmp -L. -L$(GHC_RUNTIME_DIR)/gmp
 ifeq "$(IS_CBITS_LIB)" ""
 SRC_BLD_DLL_OPTS += $(patsubst %,-lHS%_$(way_)imp, $(PACKAGE_DEPS))
@@ -798,7 +648,7 @@ endif # LINK
 # friends can be overridden from their original settings in mk/config.mk.in
 # || mk/build.mk
 #
-.PHONY: install installdirs install-strip install-dirs uninstall install-docs show-install
+.PHONY: install install-docs installdirs install-strip install-dirs uninstall install-docs show-install
 
 show-install :
 	@echo "bindir = $(bindir)"
@@ -821,16 +671,6 @@ install-dirs ::
 # within the various install targets instead.
 #install:: install-dirs
 
-# Install libraries automatically
-ifneq "$(LIBRARY)" ""
-INSTALL_LIBS  += $(LIBRARY)
-ifeq "$(DLLized)" "YES"
-INSTALL_PROGS += $(DLL_NAME)
-INSTALL_LIBS += $(patsubst %.a,%_imp.a, $(LIBRARY))
-endif
-INSTALL_DATAS += $(HS_IFACES)
-endif
-
 ifneq "$(INSTALL_PROGS)" ""
 
 #
@@ -842,13 +682,7 @@ ifneq "$(INSTALL_PROGS)" ""
 # entry in the INSTALL_PROGS list. If there's no suffix, use
 # $(exeext).
 # 
-# This is bit of a pain to express since GNU make doesn't have
-# something like $(if ...), but possible using $(subst ...)
-# [Aside: I added support for $(if ...) to my local copy of GNU
-# make at one stage, perhaps I should propagate the patch to
-# the GNU make maintainers...] 
-#
-INSTALL_PROGS := $(foreach p, $(INSTALL_PROGS), $(addsuffix $(subst _,,$(subst __,$(exeext),_$(suffix $(p))_)), $(basename $(p))))
+INSTALL_PROGS := $(foreach p, $(INSTALL_PROGS), $(addsuffix $(if $(suffix $(p)),,$(exeext)), $(basename $(p))))
 
 install:: $(INSTALL_PROGS)
 	@$(INSTALL_DIR) $(bindir)
@@ -896,6 +730,8 @@ install:: $(INSTALL_LIBS)
 		    $(RANLIB) $(libdir)/`basename $$i` ;; \
 		  *.dll) \
 		    $(INSTALL_DATA) -s $(INSTALL_OPTS) $$i $(libdir) ;; \
+		  *.so) \
+		    $(INSTALL_SHLIB) $(INSTALL_OPTS) $$i $(libdir) ;; \
 		  *) \
 		    $(INSTALL_DATA) $(INSTALL_OPTS) $$i $(libdir); \
 		esac; \
@@ -924,6 +760,14 @@ install:: $(INSTALL_DATAS)
 	done
 endif
 
+ifneq "$(INSTALL_DATAS_WITH_DIRS)" ""
+install:: $(INSTALL_DATAS_WITH_DIRS)
+	@$(INSTALL_DIR) $(datadir)
+	for i in $(INSTALL_DATAS_WITH_DIRS); do \
+		$(INSTALL_DATA) $(INSTALL_OPTS) $$i $(datadir)/`dirname $$i`; \
+	done
+endif
+
 ifneq "$(INSTALL_INCLUDES)" ""
 install:: $(INSTALL_INCLUDES)
 	@$(INSTALL_DIR) $(includedir)
@@ -932,6 +776,28 @@ install:: $(INSTALL_INCLUDES)
 	done
 endif
 
+ifneq "$(INSTALL_DOCS)" ""
+install-docs:: $(INSTALL_DOCS)
+	@$(INSTALL_DIR) $(datadir)	
+	for i in $(INSTALL_DOCS); do \
+		$(INSTALL_DATA) $(INSTALL_OPTS) $$i $(datadir); \
+	done
+endif
+
+ifneq "$(INSTALL_SGML_DOC)" ""
+ifneq "$(SGMLDocWays)" ""
+install-docs:: $(foreach i,$(SGMLDocWays),$(INSTALL_SGML_DOC).$i)
+	@$(INSTALL_DIR) $(datadir)	
+	for i in $(SGMLDocWays); do \
+		if [ $$i = "html" ]; then \
+			$(CP) -r $(INSTALL_SGML_DOC) $(datadir); \
+		else \
+			$(INSTALL_DATA) $(INSTALL_OPTS) $(INSTALL_SGML_DOC).$$i $(datadir); \
+		fi \
+	done
+endif
+endif
+
 #
 # Use with care..
 #
@@ -969,11 +835,11 @@ install-strip::
 	@$(MAKE) EXTRA_INSTALL_OPTS='-s' install                                	
 endif
 
-###########################################
+##############################################################################
 #
 #	Targets: check tags show
 #
-###########################################
+##############################################################################
 
 #------------------------------------------------------------
 # 			Check
@@ -1011,15 +877,20 @@ endif
 #
 
 show:
-	@echo '$(VALUE)=$($(VALUE))'
+	@echo '$(VALUE)="$($(VALUE))"'
 
-#--------------------------------------------------------------------------
-# SGML Documentation
+################################################################################
+#
+#			SGML Documentation
 #
+################################################################################
+
 .PHONY: dvi ps html pdf rtf
 
 ifneq "$(SGML_DOC)" ""
 
+all :: $(SGMLDocWays)
+
 # multi-file SGML document: main document name is specified in $(SGML_DOC),
 # sub-documents (.sgml files) listed in $(SGML_SRCS).
 
@@ -1054,11 +925,11 @@ extraclean ::
 	$(RM) -rf $(SGML_DOC)
 endif
 
-###########################################
+##############################################################################
 #
 #	Targets: clean
 #
-###########################################
+##############################################################################
 
 # we have to be careful about recursion here; since all the clean
 # targets are recursive, we don't want to make eg. distclean depend on
@@ -1083,11 +954,11 @@ maintainer-clean:: extraclean
 	@echo 'deletes files that may need special tools to rebuild.'
 	rm -f $(MOSTLY_CLEAN_FILES) $(CLEAN_FILES) $(DIST_CLEAN_FILES) $(MAINTAINER_CLEAN_FILES)
 
-#################################################################################
+################################################################################
 #
 #			Way management
 #
-#################################################################################
+################################################################################
 
 # Here is the ingenious jiggery pokery that allows you to build multiple versions
 # of a program in a single build tree.
@@ -1142,6 +1013,16 @@ $(LIB_WAY_TARGETS) :
 
 endif	# if way
 
+# -------------------------------------------------------------------------
+# Object and interface files have suffixes tagged with their ways
+
+ifneq "$(way)" ""
+SRC_HC_OPTS += -hisuf $(way_)hi -hcsuf $(way_)hc -osuf $(way_)o
+endif
+
+# -------------------------------------------------------------------------
+# Rules to invoke the current target recursively for each way
+
 ifneq "$(WAYS)" ""
 ifeq "$(way)" ""
 
@@ -1170,3 +1051,104 @@ all docs TAGS clean distclean mostlyclean maintainer-clean install ::
 
 endif
 endif
+
+
+##################################################################
+#
+# 		Recursive stuff
+#
+# This was once at the top of the file, allegedly because it was
+# needed for some targets, e.g. when building DLLs in libraries.  But
+# since this reason is a little short on information, and I'm having
+# trouble with subdirectory builds happening before the current
+# directory when building hslibs (bad interaction with including
+# _hsc.o files in the cbits lib) so I'm moving the recursive makes to
+# the end --SDM 12/12/2001
+#
+##################################################################
+
+# Here are the diabolically clever rules that
+# 
+# (a) for each "recursive target" <t>
+#     propagates "make <t>" to directories in SUBDIRS
+#
+# (b) when SUBDIRS is empty,
+#     for each "multi-way-target" <t>
+#     calls "make way=w <t>" for each w in $(WAYS)
+#
+#     This has the effect of making the standard target
+#     in each of the specified ways (as well as in the normal way
+
+# Controlling variables
+#	WAYS    = extra (beyond the normal way) ways to build things in
+# 	SUBDIRS = subdirectories to recurse into
+
+# No ways, so iterate over the SUBDIRS
+
+# note about recursively invoking make: we'd like make to drop all the
+# way back to the top level if it fails in any of the
+# sub(sub-...)directories.  This is done by setting the -e flag to the
+# shell during the loop, which causes an immediate failure if any of
+# the shell commands fail.
+
+# One exception: if the user gave the -i or -k flag to make in the
+# first place, we'd like to reverse this behaviour.  So we check for
+# these flags, and set the -e flag appropriately.  NOTE: watch out for
+# the --no-print-directory flag which is passed to recursive
+# invocations of make.
+#
+ifneq "$(SUBDIRS)" ""
+
+# we override the 'boot', 'all' and 'install' targets in the top
+# level Makefile. Some of the sub-projects also set 'boot' to empty.
+
+ifeq "$(NO_ALL_TARGET)" "YES"
+ALL_TARGET     =
+else
+ALL_TARGET     = all
+endif
+
+ifeq "$(NO_BOOT_TARGET)" "YES"
+BOOT_TARGET    =
+else
+BOOT_TARGET    = boot
+endif
+
+ifeq "$(NO_INSTALL_TARGET)" "YES"
+INSTALL_TARGET =
+INSTALL_DOCS_TARGET =
+else
+INSTALL_TARGET = install
+INSTALL_DOCS_TARGET = install-docs
+endif
+
+$(ALL_TARGET) docs runtests $(BOOT_TARGET) TAGS clean distclean mostlyclean maintainer-clean $(INSTALL_TARGET) $(INSTALL_DOCS_TARGET) html ps dvi txt::
+	@echo "------------------------------------------------------------------------"
+	@echo "===fptools== Recursively making \`$@' in $(SUBDIRS) ..."
+	@echo "PWD = $(shell pwd)"
+	@echo "------------------------------------------------------------------------"
+# Don't rely on -e working, instead we check exit return codes from sub-makes.
+	@case '${MFLAGS}' in *-[ik]*) x_on_err=0;; *-r*[ik]*) x_on_err=0;; *) x_on_err=1;; esac; \
+	for i in $(SUBDIRS); do \
+	  echo "------------------------------------------------------------------------"; \
+	  echo "==fptools== $(MAKE) $@ $(MFLAGS);"; \
+	  echo " in $(shell pwd)/$$i"; \
+	  echo "------------------------------------------------------------------------"; \
+	  $(MAKE) --no-print-directory -C $$i $(MFLAGS) $@; \
+	  if [ $$? -eq 0 -o $$x_on_err -eq 0 ] ;  then true; else exit 1; fi; \
+	done
+	@echo "------------------------------------------------------------------------"
+	@echo "===fptools== Finished making \`$@' in $(SUBDIRS) ..."
+	@echo "PWD = $(shell pwd)"
+	@echo "------------------------------------------------------------------------"
+
+endif
+
+#
+# Selectively building subdirectories.
+#
+#
+ifneq "$(SUBDIRS)" ""
+$(SUBDIRS) ::
+	  $(MAKE) -C $@ $(MFLAGS)
+endif