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Make the yacc rules safe for parallel make. See discussion on pgsql-patches

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and comment in src/backend/parser/Makefile for the technical details.
This commit is contained in:
Peter Eisentraut
2001-11-16 16:32:33 +00:00
parent 7c50767f08
commit aff53b27f0
6 changed files with 38 additions and 17 deletions
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19
src/backend/parser/Makefile
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@@ -2,7 +2,7 @@
#
# Makefile for parser
#
# $Header: /cvsroot/pgsql/src/backend/parser/Makefile,v 1.34 2001/08/09 18:13:23 petere Exp $
# $Header: /cvsroot/pgsql/src/backend/parser/Makefile,v 1.35 2001/11/16 16:32:33 petere Exp $
#
#-------------------------------------------------------------------------
@@ -20,15 +20,26 @@ all: SUBSYS.o
SUBSYS.o: $(OBJS)
$(LD) $(LDREL) $(LDOUT) $@ $^
$(srcdir)/gram.c $(srcdir)/parse.h: gram.y
# There is no correct way to write a rule that generates two files.
# Rules with two targets don't have that meaning, they are merely
# shorthand for two otherwise separate rules. To be safe for parallel
# make, we must chain the dependencies like this. The semicolon is
# important, otherwise make will choose the built-in rule for
# gram.y=>gram.c.
$(srcdir)/gram.c: $(srcdir)/parse.h ;
$(srcdir)/parse.h: gram.y
ifdef YACC
$(YACC) -d $(YFLAGS) $<
mv y.tab.c $(srcdir)/gram.c
mv y.tab.h $(srcdir)/parse.h
mv -f y.tab.c $(srcdir)/gram.c
mv -f y.tab.h $(srcdir)/parse.h
else
@$(missing) bison $< $@
endif
$(srcdir)/scan.c: scan.l
ifdef FLEX
$(FLEX) $(FLEXFLAGS) -Pbase_yy -o'$@' $<