ARCv3: "uImage" target doesn't have proper dependency on "loader" and fail to build

[abrodkin]

On attempt to create uImage for ARCv3 processors (be it ARC HS58 or ARC HS68) skipping make all or simple make leads to the following error:

$ make haps_arc64_defconfig
$ make uImage
...
  SORTTAB vmlinux
  SYSMAP  System.map
  OBJCOPY arch/arc/boot/vmlinux.bin
  GZIP    arch/arc/boot/vmlinux.bin.gz
arc64-linux-nm: 'arch/arc/boot/loader': No such file
arc64-linux-nm: 'arch/arc/boot/loader': No such file
arc64-linux-nm: 'arch/arc/boot/loader': No such file
  UIMAGE  arch/arc/boot/uImage.gz
/u/abrodkin/.local/bin/mkimage: invalid entry point 0x
make[2]: *** [arch/arc/boot/uImage.gz] Error 1
make[1]: *** [uImage.gz] Error 2
make: *** [__sub-make] Error 2

That happens because apparently loader is not a dependency for uImage target.

I guess the following will fix it:

diff --git a/arch/arc/boot/Makefile b/arch/arc/boot/Makefile
index 48633d8b182b..b60aae98e5e4 100644
--- a/arch/arc/boot/Makefile
+++ b/arch/arc/boot/Makefile
@@ -9,7 +9,6 @@ OBJCOPYFLAGS= -O binary -R .note -R .note.gnu.build-id -R .comment -S
 LINUX_ENTRY_VIRT = 0x$(shell $(NM) vmlinux | awk '$$NF == "res_service" {print $$1}')

 ifeq ($(CONFIG_ISA_ARCV3),y)
-$(obj)/uImage*: $(obj)/loader
 LINUX_ENTRY_PHY = 0x$(shell $(NM) $(obj)/loader | awk '$$NF == "_entry_point" {print $$1}')
 else
 LINUX_ENTRY_PHY = $(LINUX_ENTRY_VIRT)
@@ -25,6 +24,8 @@ targets += uImage.bin
 targets += uImage.gz
 targets += uImage.lzma
 targets += loader
+targets += loader.gz
+targets += loader.lzma

 $(obj)/vmlinux.bin: vmlinux FORCE
        $(call if_changed,objcopy)
@@ -35,13 +36,31 @@ $(obj)/vmlinux.bin.gz: $(obj)/vmlinux.bin FORCE
 $(obj)/vmlinux.bin.lzma: $(obj)/vmlinux.bin FORCE
        $(call if_changed,lzma)

+$(obj)/loader.gz: $(obj)/loader FORCE
+       $(call if_changed,gzip)
+
+$(obj)/loader.lzma: $(obj)/loader FORCE
+       $(call if_changed,lzma)
+
+ifeq ($(CONFIG_ISA_ARCV3),y)
+$(obj)/uImage.bin: $(obj)/loader FORCE
+else
 $(obj)/uImage.bin: $(obj)/vmlinux.bin FORCE
+endif
        $(call if_changed,uimage,none)

+ifeq ($(CONFIG_ISA_ARCV3),y)
+$(obj)/uImage.gz: $(obj)/loader.gz FORCE
+else
 $(obj)/uImage.gz: $(obj)/vmlinux.bin.gz FORCE
+endif
        $(call if_changed,uimage,gzip)

+ifeq ($(CONFIG_ISA_ARCV3),y)
+$(obj)/uImage.lzma: $(obj)/loader.lzma FORCE
+else
 $(obj)/uImage.lzma: $(obj)/vmlinux.bin.lzma FORCE
+endif
        $(call if_changed,uimage,lzma)

 $(obj)/loader.o: $(src)/loader.S $(obj)/vmlinux.bin

[abrodkin]

Also, let's add a GitHub CI test builds to https://github.com/foss-for-synopsys-dwc-arc-processors/linux/blob/arc64/.github/workflows/ci.yml for automated testing of uImage building.

[xxkent]

Fixed here: https://github.com/foss-for-synopsys-dwc-arc-processors/linux/tree/bolsh-arc64-uImage-fix