Makefile文件中的sed介绍

haoxin$ sed --help
Usage: sed [OPTION]... {script-only-if-no-other-script} [input-file]...

-n, --quiet, --silent
suppress automatic printing of pattern space
-e script, --expression=script
add the script to the commands to be executed
-f script-file, --file=script-file
add the contents of script-file to the commands to be executed
--follow-symlinks
follow symlinks when processing in place
-i[SUFFIX], --in-place[=SUFFIX]
edit files in place (makes backup if extension supplied)
-l N, --line-length=N
specify the desired line-wrap length for the `l' command
--posix
disable all GNU extensions.
-r, --regexp-extended
use extended regular expressions in the script.
-s, --separate
consider files as separate rather than as a single continuous
long stream.
-u, --unbuffered
load minimal amounts of data from the input files and flush
the output buffers more often
--help display this help and exit
--version output version information and exit

If no -e, --expression, -f, or --file option is given, then the first
non-option argument is taken as the sed script to interpret. All
remaining arguments are names of input files; if no input files are
specified, then the standard input is read.

HOSTARCH := $(shell uname -m | \        执行shell命令  uname -m 查看主机类型//此处的：=相当于强制执行不管HOSTARCH怎么定义，都在此重新赋值
 
sed -e s/i.86/i386/ \
 
    -e s/sun4u/sparc64/ \
 
    -e s/arm.*/arm/ \
 
    -e s/sa110/arm/ \
 
    -e s/ppc64/powerpc/ \
 
    -e s/ppc/powerpc/ \
 
    -e s/macppc/powerpc/)