[PATCH] powerpc/boot: Copy serial.c in Makefile

[Daniel Axtens <dja@axtens.net>]

A couple of weeks ago, I found my powerpc64e builds were broken
when building out-of-tree with make O=../destination:

  BOOTCC  arch/powerpc/boot/serial.o
powerpc64-linux-gnu-gcc: error: arch/powerpc/boot/serial.c: No such file or directory
powerpc64-linux-gnu-gcc: fatal error: no input files

This is because 5e9dcb6188a4 ("powerpc/boot: Expose Kconfig symbols
to wrapper") adds a more specific rule for serial.c which doesn't
include a copy command. Add it.

Cc: Joel Stanley <joel@jms.id.au>
Fixes: 5e9dcb6188a4 ("powerpc/boot: Expose Kconfig symbols to wrapper")
Signed-off-by: Daniel Axtens <dja@axtens.net>
---
 arch/powerpc/boot/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile
index 111f97b1ccec..3d5b24b02228 100644
--- a/arch/powerpc/boot/Makefile
+++ b/arch/powerpc/boot/Makefile
@@ -203,6 +203,7 @@ $(obj)/zImage.coff.lds $(obj)/zImage.ps3.lds : $(obj)/%: $(srctree)/$(src)/%.S
 	$(Q)cp $< $@
 
 $(obj)/serial.c: $(obj)/autoconf.h
+	$(Q)cp $< $@
 
 $(obj)/autoconf.h: $(obj)/%: $(objtree)/include/generated/%
 	$(Q)cp $< $@
-- 
2.17.1