[PATCH/take 2] ppc: fix build with O=$(output_dir)

[Roland Dreier]

Subject: [PATCH/take 2] ppc: fix build with O=$(output_dir)

OK, here's a patch that builds a separate copy for arch/ppc/boot/lib.

Recent changes to arch/ppc/boot/lib/Makefile cause

      CC      arch/ppc/boot/lib/../../../../lib/zlib_inflate/infblock.o
    Assembler messages:
    FATAL: can't create arch/ppc/boot/lib/../../../../lib/zlib_inflate/infblock.o: No such file or directory

when building a ppc kernel using O=$(output_dir) with CONFIG_ZLIB_INFLATE=n,
because the $(output_dir)/lib/zlib_inflate directory doesn't get created.

This patch, which uses the lib/zlib_inflate sources to build objects
in the arch/ppc/boot/lib/directory, is one fix for the problem.

Signed-off-by: Roland Dreier <roland@xxxxxxxxxxx>

Index: linux-2.6.9/arch/ppc/boot/lib/Makefile
===================================================================
--- linux-2.6.9.orig/arch/ppc/boot/lib/Makefile	2004-10-18 14:54:55.000000000 -0700
+++ linux-2.6.9/arch/ppc/boot/lib/Makefile	2004-10-19 11:10:07.000000000 -0700
@@ -4,7 +4,10 @@
 
 CFLAGS_kbd.o	+= -Idrivers/char
 
-lib-y := $(addprefix ../../../../lib/zlib_inflate/, \
-           infblock.o infcodes.o inffast.o inflate.o inftrees.o infutil.o)
-lib-y += div64.o
+ZLIB_OBJS := infblock.o infcodes.o inffast.o inflate.o inftrees.o infutil.o
+
+lib-y := $(ZLIB_OBJS) div64.o
 lib-$(CONFIG_VGA_CONSOLE) += vreset.o kbd.o
+
+$(addprefix $(obj)/, $(ZLIB_OBJS)): $(obj)/%.o: lib/zlib_inflate/%.c
+	$(call if_changed,cc_o_c)
-
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