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SUBSYS.o step and allow for better optimization by the linker. Instead of partial linking into SUBSYS.o, the list of object files is assembled in objfiles.txt files that are expanded when the final linking is done. Because we are not yet sure how long command lines different platforms can handle, the old way of linking is still available, by defining the make variable PARTIAL_LINKING (e.g., make all PARTIAL_LINKING=1). If we determine that this is necessary for some platforms, then we will document this in a more prominent place.
48 lines
1.3 KiB
Makefile
48 lines
1.3 KiB
Makefile
#
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# Common make rules for backend
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#
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# $PostgreSQL: pgsql/src/backend/common.mk,v 1.2 2008/02/25 17:55:42 petere Exp $
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#
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# When including this file, set OBJS to the object files created in
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# this directory and SUBDIRS to subdirectories containing more things
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# to build.
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ifdef PARTIAL_LINKING
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# old style: linking using SUBSYS.o
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subsysfilename = SUBSYS.o
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else
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# new style: linking all object files at once
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subsysfilename = objfiles.txt
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endif
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SUBDIROBJS = $(SUBDIRS:%=%/$(subsysfilename))
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# top-level backend directory obviously has its own "all" target
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ifneq ($(subdir), src/backend)
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all: $(subsysfilename)
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endif
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SUBSYS.o: $(SUBDIROBJS) $(OBJS)
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$(LD) $(LDREL) $(LDOUT) $@ $^
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objfiles.txt: $(SUBDIROBJS) $(OBJS)
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( $(if $(SUBDIROBJS),cat $(SUBDIROBJS); )echo $(addprefix $(subdir)/,$(OBJS)) ) >$@
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# make function to expand objfiles.txt contents
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expand_subsys = $(foreach file,$(filter %/objfiles.txt,$(1)),$(patsubst ../../src/backend/%,%,$(addprefix $(top_builddir)/,$(shell cat $(file))))) $(filter-out %/objfiles.txt,$(1))
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# Parallel make trickery
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$(SUBDIROBJS): $(SUBDIRS:%=%-recursive) ;
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.PHONY: $(SUBDIRS:%=%-recursive)
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$(SUBDIRS:%=%-recursive):
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$(MAKE) -C $(subst -recursive,,$@) all
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clean: clean-local
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clean-local:
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ifdef SUBDIRS
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for dir in $(SUBDIRS); do $(MAKE) -C $$dir clean || exit; done
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endif
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rm -f $(subsysfilename) $(OBJS)
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