parisc: decompressor: do not copy source files while building

As commit 7ae4a78d ("ARM: 8969/1: decompressor: simplify libfdt
builds") stated, copying source files during the build time may not
end up with as clean code as expected.

Do similar for parisc to clean up the Makefile.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Acked-by: Helge Deller <deller@gmx.de>
Signed-off-by: Helge Deller <deller@gmx.de>

arch/parisc/boot/compressed/.gitignore

 # SPDX-License-Identifier: GPL-2.0-only
-firmware.c
-real2.S
 sizes.h
 vmlinux
 vmlinux.lds

arch/parisc/boot/compressed/Makefile

@@ -13,7 +13,6 @@ OBJECTS := head.o real2.o firmware.o misc.o piggy.o
 targets := vmlinux.lds vmlinux vmlinux.bin vmlinux.bin.gz vmlinux.bin.bz2
 targets += vmlinux.bin.xz vmlinux.bin.lzma vmlinux.bin.lzo vmlinux.bin.lz4
 targets += $(OBJECTS) sizes.h
-targets += real2.S firmware.c
 
 KBUILD_CFLAGS := -D__KERNEL__ -O2 -DBOOTLOADER
 KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
@@ -42,14 +41,7 @@ $(obj)/head.o: $(obj)/sizes.h
 CFLAGS_misc.o += -I$(objtree)/$(obj)
 $(obj)/misc.o: $(obj)/sizes.h
 
-$(obj)/firmware.o: $(obj)/firmware.c
-$(obj)/firmware.c: $(srctree)/arch/$(SRCARCH)/kernel/firmware.c
-	$(call cmd,shipped)
-
 AFLAGS_real2.o += -DBOOTLOADER
-$(obj)/real2.o: $(obj)/real2.S
-$(obj)/real2.S: $(srctree)/arch/$(SRCARCH)/kernel/real2.S
-	$(call cmd,shipped)
 
 CPPFLAGS_vmlinux.lds += -I$(objtree)/$(obj) -DBOOTLOADER
 $(obj)/vmlinux.lds: $(obj)/sizes.h

arch/parisc/boot/compressed/firmware.c

+// SPDX-License-Identifier: GPL-2.0-only
+#include "../../kernel/firmware.c"

arch/parisc/boot/compressed/real2.S

+/* SPDX-License-Identifier: GPL-2.0-only */
+#include "../../kernel/real2.S"

scripts/remove-stale-files

@@ -33,4 +33,9 @@ if [ -n "${building_out_of_srctree}" ]; then
 	do
 		rm -f arch/mips/boot/compressed/${f}
 	done
+
+	for f in firmware.c real2.S
+	do
+		rm -f arch/parisc/boot/compressed/${f}
+	done
 fi