使用 GNU Make 将多行变量输出到文件
我很难编写在文件中输出多行变量的 makefile 规则。
这是我的代码：
define VAR1
/dev d 755 - - - - -
endef
define VAR2
/test d 777 - - - - -
/test2 d 777 - - - - -
endef
VARS += $(VAR1)
VARS += $(VAR2)
all:
echo "$(VARS)" > test
但是，由于我未知的原因，回显无法告诉“未终止的引用字符串”。 我怎样才能将在单独的行上声明的每一行放入文件中？
I'm having hard time writing a makefile rule that outputs a multiline variable in a file.
Here is the code I have :
define VAR1
/dev d 755 - - - - -
endef
define VAR2
/test d 777 - - - - -
/test2 d 777 - - - - -
endef
VARS += $(VAR1)
VARS += $(VAR2)
all:
echo "$(VARS)" > test
However, the echo fails telling "Unterminated quoted string" for a reason unknown to me.
How could i put in the file every lines declared on a separate line ?
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如果将变量导出到 shell 并将其作为 shell 变量而不是 make 变量引用，那么您的运气会更好：
请注意对 makefile 的以下调整：
define来创建VARS，而不是一系列+=赋值，这样可以更轻松地在VAR1和VAR2.export VARS添加到您的 makefile 中，以将变量推送到 shell 调用的环境中。$$VARS而不是$(VARS)来取消引用它——这将扩展留给 shell，而不是 make，这将避免“未终止的引用”字符串”错误。If you export the variable to the shell and reference it as a shell variable, rather than a make variable, you will have better luck:
Note the following adjustments to your makefile:
defineto createVARS, rather than a series of+=assignments, which makes it easier to get a newline between the value ofVAR1andVAR2.export VARSto your makefile, to get the variable pushed into the environment for the shell invocation.$$VARSrather than$(VARS)to dereference it -- that leaves the expansion to the shell, rather than to make, which will avoid the "Unterminated quoted string" error.直接写入文件的功能：
GNU make 4.0 添加了 您仍然需要使用
define来定义VARS，或者VAR1的最后一行和VAR2的第一行> 将被粘在一个上 线。另外，不要在$(file ...)构造中的逗号后面添加空格，否则输出中将会有一个前导空格！GNU make 4.0 adds the ability to write files directly:
Note that you still need to use
defineto defineVARS, or the last line ofVAR1and the first line ofVAR2will be glommed onto one line. Also, don't put a space after the comma in the$(file ...)construct, or there will be a leading space in the output!看起来好像您收到“未终止的引号字符串”，因为 Make 在单独的 shell 中执行配方的每一行，第一行是：
这是我能想到的最佳解决方案（我承认这不是很好，但你违背了 Make 的原则）是将 VARS 传递给调用
$(info ...)的子 Make：Makefile:
Makefile.print:
It looks as if you're getting "Unterminated quoted string" because Make executes each line of the recipe in a separate shell, and the first line is:
Here's the best solution I could come up with (and I admit it's not very good, but you're going against the grain of Make) is to pass
VARSto a sub-Make which invokes$(info ...):Makefile:
Makefile.print: