uboot顶层makefile部分解析

VERSION = 2016

PATCHLEVEL = 03

SUBLEVEL =

EXTRAVERSION =

NAME =

MAKEFLAGS += -rR --include-dir=$(CURDIR)

unexport LC_ALL

LC_COLLATE=C

LC_NUMERIC=C

export LC_COLLATE LC_NUMERIC

unexport GREP_OPTIONS

ifeq ("$(origin V)", "command line")

KBUILD_VERBOSE = $(V)

endif

ifndef KBUILD_VERBOSE

KBUILD_VERBOSE = 0

endif

ifeq ($(KBUILD_VERBOSE),1)

quiet =

Q =

else

quiet=quiet_

Q = @

endif

ifneq ($(filter 4.%,$(MAKE_VERSION)),)

ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)

quiet=silent_

endif

else

ifneq ($(filter s% -s%,$(MAKEFLAGS)),)

quiet=silent_

endif

endif

export quiet Q KBUILD_VERBOSE

mytest:

@echo 'firstword=' $(firstword x$(MAKEFLAGS))

export srctree objtree VPATH

unexport CDPATH

HOSTARCH := $(shell uname -m |

sed -e s/i.86/x86/

-e s/sun4u/sparc64/

-e s/arm.*/arm/

-e s/sa110/arm/

-e s/ppc64/powerpc/

-e s/ppc/powerpc/

-e s/macppc/powerpc/

-e s/sh.*/sh/)

HOSTOS := $(shell uname -s | tr '[:upper:]' '[:lower:]' |

sed -e 's/(cygwin).*/cygwin/')

exportHOSTARCH HOSTOS