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scripts/kconfig/Makefile: Allow KBUILD_DEFCONFIG to be a target
Arch Makefiles can set KBUILD_DEFCONFIG to tell kbuild the name of the defconfig that should be built by default. However currently there is an assumption that KBUILD_DEFCONFIG points to a file at arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG). We would like to use a target, using merge_config, as our defconfig, so adapt the logic in scripts/kconfig/Makefile to allow that. To minimise the chance of breaking anything, we first check if KBUILD_DEFCONFIG is a file, and if so we do the old logic. If it's not a file, then we call the top-level Makefile with KBUILD_DEFCONFIG as the target. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Acked-by: Michal Marek <mmarek@suse.com>
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@ -96,9 +96,12 @@ savedefconfig: $(obj)/conf
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defconfig: $(obj)/conf
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ifeq ($(KBUILD_DEFCONFIG),)
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$< $(silent) --defconfig $(Kconfig)
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else
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else ifneq ($(wildcard arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG)),)
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@$(kecho) "*** Default configuration is based on '$(KBUILD_DEFCONFIG)'"
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$(Q)$< $(silent) --defconfig=arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG) $(Kconfig)
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else
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@$(kecho) "*** Default configuration is based on target '$(KBUILD_DEFCONFIG)'"
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$(Q)$(MAKE) -f $(srctree)/Makefile $(KBUILD_DEFCONFIG)
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endif
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%_defconfig: $(obj)/conf
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