make ARCH=arm sama5_defconfig

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1. make ARCH=arm sama5_defconfig

%config: scripts_basic outputmakefile FORCE
$(Q)$(MAKE) $(build)=scripts/kconfig $@

sama5_defconfig: scripts_basic

make -f ./scripts/Makefile.build obj=scripts/kconfig sama5_defconfig

scripts_basic:
$(Q)$(MAKE) $(build)=scripts/basic
$(Q)rm -f .tmp_quiet_recordmcount

scripts_basic:
make -f ./scripts/Makefile.build obj=scripts/basic
rm -f .tmp_quiet_recordmcount

从上面看到实际要执行的指令如下

make -f ./scripts/Makefile.build obj=scripts/basic

rm -f .tmp_quiet_recordmcount

make -f ./scripts/Makefile.build obj=scripts/kconfig sama5_defconfig

2. make -f ./scripts/Makefile.build obj=scripts/basic

因为没有指定目标，因此，__build为默认目标

__build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
$(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
$(subdir-ym) $(always)
@:

__build: scripts/basic/fixdep

最终这条命令会将fixdep.c编译出fixdep

3. make -f ./scripts/Makefile.build obj=scripts/kconfig sama5_defconfig

从执行的输出来看，这句话是先用zconf.tab.c和conf.c编译出了conf，然后执行

scripts/kconfig/conf --defconfig=arch/arm/configs/sama5_defconfig Kconfig

来生成.config文件

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