多行变量定义在Makefile中不起作用

Question

我正在尝试使用multiline variable definition in my Makefile，但它似乎对我不起作用：

$ cat Makefile
define foo =
I'm a little teapot
short and stout
here is my handle
here is my spout
endef

all:
    echo "$(foo)"
$ make all
echo ""

$ make --version
GNU Make 3.81
Copyright (C) 2006  Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.

This program built for i386-apple-darwin11.3.0

我做错了什么？

Answer 1

试试这个：

define foo
I'm a little teapot
short and stout
here is my handle
here is my spout
endef

$(info $(foo))


all:
    echo the shell dislikes multiline variables

正在定义的变量名称后面的=似乎不适用于3.81中的define语句，如果 echo 是多行变量， shell会将第一行之后的行解释为命令。