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Link postgres from all object files at once, to avoid the error-prone

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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.
This commit is contained in:
Peter Eisentraut
2008-02-25 17:55:42 +00:00
parent ad20c990f7
commit 9956ddc191
2 changed files with 44 additions and 28 deletions
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32
src/backend/common.mk
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@@ -1,25 +1,47 @@
#
# Common make rules for backend
#
# $PostgreSQL: pgsql/src/backend/common.mk,v 1.1 2008/02/19 10:30:06 petere Exp $
# $PostgreSQL: pgsql/src/backend/common.mk,v 1.2 2008/02/25 17:55:42 petere Exp $
#
SUBDIROBJS = $(SUBDIRS:%=%/SUBSYS.o)
# When including this file, set OBJS to the object files created in
# this directory and SUBDIRS to subdirectories containing more things
# to build.
all: SUBSYS.o
ifdef PARTIAL_LINKING
# old style: linking using SUBSYS.o
subsysfilename = SUBSYS.o
else
# new style: linking all object files at once
subsysfilename = objfiles.txt
endif
SUBDIROBJS = $(SUBDIRS:%=%/$(subsysfilename))
# top-level backend directory obviously has its own "all" target
ifneq ($(subdir), src/backend)
all: $(subsysfilename)
endif
SUBSYS.o: $(SUBDIROBJS) $(OBJS)
$(LD) $(LDREL) $(LDOUT) $@ $^
objfiles.txt: $(SUBDIROBJS) $(OBJS)
( $(if $(SUBDIROBJS),cat $(SUBDIROBJS); )echo $(addprefix $(subdir)/,$(OBJS)) ) >$@
# make function to expand objfiles.txt contents
expand_subsys = $(foreach file,$(filter %/objfiles.txt,$(1)),$(patsubst ../../src/backend/%,%,$(addprefix $(top_builddir)/,$(shell cat $(file))))) $(filter-out %/objfiles.txt,$(1))
# Parallel make trickery
$(SUBDIROBJS): $(SUBDIRS:%=%-recursive) ;
.PHONY: $(SUBDIRS:%=%-recursive)
$(SUBDIRS:%=%-recursive):
$(MAKE) -C $(subst -recursive,,$@) SUBSYS.o
$(MAKE) -C $(subst -recursive,,$@) all
clean: clean-local
clean-local:
ifdef SUBDIRS
for dir in $(SUBDIRS); do $(MAKE) -C $$dir clean || exit; done
endif
rm -f SUBSYS.o $(OBJS)
rm -f $(subsysfilename) $(OBJS)