Add support for VPATH builds, that is, building somewhere else than in the

source directory.  This involves mostly makefiles using $(srcdir) when they
might have used ".".  (Regression tests don't work with this, yet.)

Sort out usage of CPPFLAGS, CFLAGS (and CXXFLAGS).  Add "override" keyword
in most places, to preserve necessary flags even when the user overrode the
flags.

src/makefiles/Makefile.irix5

@@ -6,4 +6,5 @@ MK_NO_LORDER= true
 %.so: %.o
 	$(LD) -G -Bdynamic -shared -o $@ $< 
 
-CFLAGS+= -U_NO_XOPEN4 -woff 1164,1171,1185,1195,1552 -Wl,-woff,15 -Wl,-woff,84
+override CPPFLAGS += -U_NO_XOPEN4
+override CFLAGS += -woff 1164,1171,1185,1195,1552 -Wl,-woff,15 -Wl,-woff,84

src/makefiles/Makefile.sco

@@ -1,4 +1,4 @@
-CFLAGS += -dy
+override CFLAGS += -dy
 export_dynamic = -W l,-Bexport
 
 %.so: %.o

src/makefiles/Makefile.ultrix4

@@ -1,9 +1,7 @@
-# install creates intermediate directories
-NO_BEFOREINSTL= true
 SHELL=/bin/sh5
 
 #
 # "-G 0" works for both DEC cc and GNU cc.
 #
 %.so: %.c
-	$(CC) -c -G 0 $(CFLAGS) -o $@ $<
+	$(CC) -c -G 0 $(CPPFLAGS) $(CFLAGS) -o $@ $<

src/makefiles/Makefile.win

@@ -1,4 +1,4 @@
-# $Header: /cvsroot/pgsql/src/makefiles/Attic/Makefile.win,v 1.5 2000/09/29 13:36:50 petere Exp $
+# $Header: /cvsroot/pgsql/src/makefiles/Attic/Makefile.win,v 1.6 2000/10/20 21:04:13 petere Exp $
 LDFLAGS+= -g
 DLLTOOL= dlltool
 DLLWRAP= dllwrap
@@ -18,5 +18,5 @@ LIBS:=$(filter-out -lm -lc, $(LIBS))
 
 curdir:=$(shell pwd)
 ifeq ($(findstring backend,$(curdir)), backend)
-CPPFLAGS+= -DBUILDING_DLL=1
+override CPPFLAGS+= -DBUILDING_DLL=1
 endif