linux-kernel - [PATCH] cris: Only build flash rescue image if CONFIG_ETRAX

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Date:   Sun, 30 Oct 2016 09:09:18 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Mikael Starvik <starvik@...s.com>
Cc:     Jesper Nilsson <jesper.nilsson@...s.com>,
        linux-cris-kernel@...s.com, linux-kernel@...r.kernel.org,
        Guenter Roeck <linux@...ck-us.net>
Subject: [PATCH] cris: Only build flash rescue image if CONFIG_ETRAX_AXISFLASHMAP is selected

If CONFIG_ETRAX_AXISFLASHMAP is not configured, the flash rescue image
object file is empty. With recent versions of binutils, this results
in the following build error.

cris-linux-objcopy: error:
	the input file 'arch/cris/boot/rescue/rescue.o' has no sections

This is seen, for example, when trying to build cris:allnoconfig
with recently generated toolchains.

Since it does not make sense to build a flash rescue image if there is
no flash, only build it if CONFIG_ETRAX_AXISFLASHMAP is enabled.

Reported-by: kbuild test robot <fengguang.wu@...el.com>
Fixes: 66ab3a74c5ce ("CRIS: Merge machine dependent boot/compressed ..")
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
 arch/cris/boot/rescue/Makefile | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/cris/boot/rescue/Makefile b/arch/cris/boot/rescue/Makefile
index 52bd0bd1dd22..d98edbb30a18 100644
--- a/arch/cris/boot/rescue/Makefile
+++ b/arch/cris/boot/rescue/Makefile
@@ -10,6 +10,9 @@
 
 asflags-y += $(LINUXINCLUDE)
 ccflags-y += -O2 $(LINUXINCLUDE)
+
+ifdef CONFIG_ETRAX_AXISFLASHMAP
+
 arch-$(CONFIG_ETRAX_ARCH_V10) = v10
 arch-$(CONFIG_ETRAX_ARCH_V32) = v32
 
@@ -28,6 +31,11 @@ $(obj)/rescue.bin: $(obj)/rescue.o FORCE
 	$(call if_changed,objcopy)
 	cp -p $(obj)/rescue.bin $(objtree)
 
+else
+$(obj)/rescue.bin:
+
+endif
+
 $(obj)/testrescue.bin: $(obj)/testrescue.o
 	$(OBJCOPY) $(OBJCOPYFLAGS) $(obj)/testrescue.o tr.bin
 # Pad it to 784 bytes
-- 
2.5.0