[PATCH] powerpc/boot: regenerate zImage linker script when options change

[Nicholas Piggin <npiggin@gmail.com>]

Changing config options (e.g., endianness) does not always seem to
regenerate zImage.lds properly. Adapt the standard kernel linker script
build command and use that.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 arch/powerpc/boot/Makefile | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile
index 0442516..cf60936 100644
--- a/arch/powerpc/boot/Makefile
+++ b/arch/powerpc/boot/Makefile
@@ -175,9 +175,12 @@ $(addprefix $(obj)/,$(libfdt) $(libfdtheader)): $(obj)/%: $(srctree)/scripts/dtc
 $(obj)/empty.c:
 	$(Q)touch $@
 
-$(obj)/zImage.lds: $(obj)/%: $(srctree)/$(src)/%.S
-	$(CROSS32CC) $(cpp_flags) -E -Wp,-MD,$(depfile) -P -Upowerpc \
-		-D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
+quiet_cmd_cpp_lds_S = LDS     $@
+	cmd_cpp_lds_S = $(CROSS32CC) $(cpp_flags) -E -Wp,-MD,$(depfile) -P \
+			-Upowerpc -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
+
+$(obj)/zImage.lds: $(obj)/%: $(srctree)/$(src)/%.S FORCE
+	$(call if_changed_dep,cpp_lds_S)
 
 $(obj)/zImage.coff.lds $(obj)/zImage.ps3.lds : $(obj)/%: $(srctree)/$(src)/%.S
 	$(Q)cp $< $@
-- 
2.10.2