Makefile 配置文件

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Makefile 文件中制定了软件编译构建过程中的源文件依赖关系及编译参数，其中一些编译配置是架构相关的。

配置架构相关源文件及参数

示例：kexec-tools 的 Makefile 文件多架构组织结构

项目名称：kexec-tools
项目版本：
相关文件：/kexec/Makefile
简介：在 /kexec/arch 文件夹下有多个以架构名命名的文件夹，各自包括一个 Makefile 文件。顶层目录中的 Makefile 中引用各架构下的 Makefile 文件。

在 /kexec/arch 文件夹下有多个以架构名命名的子文件夹，每个子文件夹都包括一个 Makefile 文件。这些 Makefile 中均存在 架构名_KEXEC_SRCS 和 dist 变量，它们在 src/Makefile.in 参与编译构建。

不同架构下的 Makefile 文件中的主要区别体现在 架构名_KEXEC_SRCS 和 dist 中增减依赖的源文件。其中 RISC-V 架构与 ARM64 架构对应的 Makefile 内容相似度较高，下面列出了二者的相似部分：

变量	RISC-V	ARM64
`架构名_KEXEC_SRCS`	`riscv_KEXEC_SRCS = kexec/arch/riscv/kexec-riscv.c riscv_KEXEC_SRCS += kexec/arch/riscv/kexec-elf-riscv.c`	`arm64_KEXEC_SRCS += \ kexec/arch/arm64/crashdump-arm64.c \ kexec/arch/arm64/kexec-arm64.c \ kexec/arch/arm64/kexec-elf-arm64.c \ kexec/arch/arm64/kexec-uImage-arm64.c \ kexec/arch/arm64/kexec-image-arm64.c \ kexec/arch/arm64/kexec-zImage-arm64.c`
`架构名_MEM_REGIONS`	`riscv_MEM_REGIONS = kexec/mem_regions.c`	`arm64_MEM_REGIONS = kexec/mem_regions.c`
`架构名_DT_OPS`	`riscv_DT_OPS += kexec/dt-ops.c`	`arm64_DT_OPS += kexec/dt-ops.c`
`架构名_ARCH_REUSE_INITRD`	`riscv_ARCH_REUSE_INITRD =`	`arm64_ARCH_REUSE_INITRD =`
`架构名_CPPFLAGS`	`riscv_CPPFLAGS += -I $(srcdir)/kexec/`	`arm64_CPPFLAGS += -I $(srcdir)/kexec/`
`dist`	`dist += kexec/arch/riscv/Makefile $(riscv_KEXEC_SRCS) \ kexec/arch/riscv/kexec-riscv.h \ kexec/arch/riscv/include/arch/options.h`	`dist += $(arm64_KEXEC_SRCS) \ kexec/arch/arm64/include/arch/options.h \ kexec/arch/arm64/crashdump-arm64.h \ kexec/arch/arm64/image-header.h \ kexec/arch/arm64/iomem.h \ kexec/arch/arm64/kexec-arm64.h \ kexec/arch/arm64/Makefile`
`HAVE_LIBFDT`	`ifdef HAVE_LIBFDT LIBS += -lfdt else include $(srcdir)/kexec/libfdt/Makefile.libfdt libfdt_SRCS += $(LIBFDT_SRCS:%=kexec/libfdt/%) riscv_CPPFLAGS += -I$(srcdir)/kexec/libfdt riscv_KEXEC_SRCS += $(libfdt_SRCS) endif`	`ifdef HAVE_LIBFDT LIBS += -lfdt else include $(srcdir)/kexec/libfdt/Makefile.libfdt libfdt_SRCS += $(LIBFDT_SRCS:%=kexec/libfdt/%) arm64_CPPFLAGS += -I$(srcdir)/kexec/libfdt arm64_KEXEC_SRCS += $(libfdt_SRCS) endif`

/kexec/arch/arm64/Makefile 还有一些其他变量定义：

arm64_FS2DT += kexec/fs2dt.c
arm64_FS2DT_INCLUDE += \
 -include $(srcdir)/kexec/arch/arm64/crashdump-arm64.h \
 -include $(srcdir)/kexec/arch/arm64/kexec-arm64.h
arm64_UIMAGE = kexec/kexec-uImage.c
arm64_ADD_SEGMENT =
arm64_VIRT_TO_PHYS =
arm64_PHYS_TO_VIRT =

src\kexec\Makefile 文件中包含了 src\kexec\arch\ 中的各子文件夹中的 Makefile 文件：

# Line 81-95
include $(srcdir)/kexec/arch/alpha/Makefile
include $(srcdir)/kexec/arch/arm/Makefile
include $(srcdir)/kexec/arch/arm64/Makefile
include $(srcdir)/kexec/arch/i386/Makefile
include $(srcdir)/kexec/arch/ia64/Makefile
include $(srcdir)/kexec/arch/m68k/Makefile
include $(srcdir)/kexec/arch/mips/Makefile
include $(srcdir)/kexec/arch/cris/Makefile
include $(srcdir)/kexec/arch/ppc/Makefile
include $(srcdir)/kexec/arch/ppc64/Makefile
include $(srcdir)/kexec/arch/riscv/Makefile     # Line 91: RISC-V Support
include $(srcdir)/kexec/arch/s390/Makefile
include $(srcdir)/kexec/arch/sh/Makefile
include $(srcdir)/kexec/arch/x86_64/Makefile
include $(srcdir)/kexec/arch/hppa/Makefile

src/Makefile.in 对编译构建的操作做了配置，其中包含了 src\kexec\Makefile ：

#
# kexec (linux booting linux)
#
include $(srcdir)/kexec/Makefile # Line 166