On Windows, we know the backend stack size limit because we have to

specify it explicitly in backend/Makefile.  Arrange for this value to
be known by get_stack_depth_rlimit() too.  Per suggestion from Magnus.

src/Makefile.global.in

 # -*-makefile-*-
-# $PostgreSQL: pgsql/src/Makefile.global.in,v 1.231 2006/10/03 22:18:22 tgl Exp $
+# $PostgreSQL: pgsql/src/Makefile.global.in,v 1.232 2006/10/08 17:15:33 tgl Exp $
 
 #------------------------------------------------------------------------------
 # All PostgreSQL makefiles include this file and use the variables it sets,
@@ -311,6 +311,9 @@ HAVE_POSIX_SIGNALS= @HAVE_POSIX_SIGNALS@
 # systems now.  May be applicable to other systems to?
 ELF_SYSTEM= @ELF_SYS@
 
+# Backend stack size limit has to be hard-wired on Windows (it's in bytes)
+WIN32_STACK_RLIMIT=4194304
+
 # Pull in platform-specific magic
 include $(top_builddir)/src/Makefile.port
 

src/backend/Makefile

@@ -4,7 +4,7 @@
 #
 # Copyright (c) 1994, Regents of the University of California
 #
-# $PostgreSQL: pgsql/src/backend/Makefile,v 1.119 2006/09/09 03:15:40 tgl Exp $
+# $PostgreSQL: pgsql/src/backend/Makefile,v 1.120 2006/10/08 17:15:33 tgl Exp $
 #
 #-------------------------------------------------------------------------
 
@@ -52,7 +52,7 @@ postgres: $(OBJS) postgres.def libpostgres.a
 	$(DLLTOOL) --dllname $@$(X) --output-exp $@.exp --def postgres.def
 	$(CC) $(CFLAGS) $(LDFLAGS) -o $@$(X) -Wl,--base-file,$@.base $@.exp $(OBJS) $(LIBS)
 	$(DLLTOOL) --dllname $@$(X) --base-file $@.base --output-exp $@.exp --def postgres.def
-	$(CC) $(CFLAGS) $(LDFLAGS) -Wl,--stack,4194304 -o $@$(X) $@.exp $(OBJS) $(LIBS)
+	$(CC) $(CFLAGS) $(LDFLAGS) -Wl,--stack,$(WIN32_STACK_RLIMIT) -o $@$(X) $@.exp $(OBJS) $(LIBS)
 	rm -f $@.exp $@.base
 
 postgres.def: $(OBJS)
@@ -69,7 +69,7 @@ postgres: $(OBJS) postgres.def libpostgres.a $(WIN32RES)
 	$(DLLTOOL) --dllname $@$(X) --output-exp $@.exp --def postgres.def
 	$(CC) $(CFLAGS) $(LDFLAGS) -o $@$(X) -Wl,--base-file,$@.base $@.exp $(OBJS) $(WIN32RES) $(LIBS)
 	$(DLLTOOL) --dllname $@$(X) --base-file $@.base --output-exp $@.exp --def postgres.def
-	$(CC) $(CFLAGS) $(LDFLAGS) -Wl,--stack=4194304 -o $@$(X) $@.exp $(OBJS) $(WIN32RES) $(LIBS)
+	$(CC) $(CFLAGS) $(LDFLAGS) -Wl,--stack=$(WIN32_STACK_RLIMIT) -o $@$(X) $@.exp $(OBJS) $(WIN32RES) $(LIBS)
 	rm -f $@.exp $@.base
 
 postgres.def: $(OBJS)

src/backend/tcop/Makefile

@@ -4,7 +4,7 @@
 #    Makefile for tcop
 #
 # IDENTIFICATION
-#    $PostgreSQL: pgsql/src/backend/tcop/Makefile,v 1.25 2003/11/29 19:51:57 pgsql Exp $
+#    $PostgreSQL: pgsql/src/backend/tcop/Makefile,v 1.26 2006/10/08 17:15:34 tgl Exp $
 #
 #-------------------------------------------------------------------------
 
@@ -14,6 +14,8 @@ include $(top_builddir)/src/Makefile.global
 
 OBJS= dest.o fastpath.o postgres.o pquery.o utility.o
 
+override CPPFLAGS += -DWIN32_STACK_RLIMIT=$(WIN32_STACK_RLIMIT)
+
 all: SUBSYS.o
 
 SUBSYS.o: $(OBJS)

src/backend/tcop/postgres.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/tcop/postgres.c,v 1.513 2006/10/07 20:16:57 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/tcop/postgres.c,v 1.514 2006/10/08 17:15:34 tgl Exp $
  *
  * NOTES
  *	  this is the "main" module of the postgres backend and
@@ -3678,8 +3678,13 @@ get_stack_depth_rlimit(void)
 	}
 	return val;
 #else /* no getrlimit */
+#if defined(WIN32) || defined(__CYGWIN__)
+	/* On Windows we set the backend stack size in src/backend/Makefile */
+	return WIN32_STACK_RLIMIT;
+#else  /* not windows ... give up */
 	return -1;
 #endif
+#endif
 }