blocks|key|104231|text|来自“Make+post先生”的https://www.cmcrossroads.com/article/printing-value-makefile-variable|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|104232|将以下规则添加到Makefile中：|104233|print-%25++:+;+@echo+$*+=+$($*)|code-block|syntax|javascript|104234|然后，如果您想要找出makefile变量的值，只需：|104235|make+print-VARIABLE|104236|然后它就会返回：|104237|VARIABLE+=+the_value_of_the_variable|104238|entityMap|0|LINK|mutability|MUTABLE|url|https://www.cmcrossroads.com/article/printing-value-makefile-variable^0|G|1X|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@$A|11|B|12|1|13]]|C|$]]|$1|D|3|E|5|6|7|14|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|15|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|16|8|@]|9|@]|C|$]]|$1|M|3|N|5|H|7|17|8|@]|9|@]|C|$I|J]]|$1|O|3|P|5|6|7|18|8|@]|9|@]|C|$]]|$1|Q|3|R|5|H|7|19|8|@]|9|@]|C|$I|J]]|$1|S|3|-4|5|6|7|1A|8|@]|9|@]|C|$]]]|T|$U|$5|V|W|X|C|$Y|Z]]]]

from a "Mr. Make post"
<a href="https://www.cmcrossroads.com/article/printing-value-makefile-variable" rel="noreferrer">https://www.cmcrossroads.com/article/printing-value-makefile-variable</a>

Add the following rule to your Makefile:

<pre><code>print-% : ; @echo $* = $($*)
</code></pre>

Then, if you want to find out the value of a makefile variable, just:

<pre><code>make print-VARIABLE
</code></pre>

and it will return:

<pre><code>VARIABLE = the_value_of_the_variable
</code></pre>

blocks|key|321103|text|所有版本的make都要求命令行的第一个字符使用制表符(而不是空格)进行缩进。如果您向我们展示了整个规则，而不仅仅是这两行，我们就可以给出更清晰的答案，但它应该是这样的：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|321104|myTarget:+myDependencies
++++++++@echo+hi|code-block|syntax|javascript|321105|其中第二行的第一个字符必须是TAB。|321106|entityMap^0|5|4|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

All versions of <code>make</code> require that command lines be indented with a TAB (not space) as the first character in the line. If you showed us the entire rule instead of just the two lines in question we could give a clearer answer, but it should be something like:

<pre><code>myTarget: myDependencies
 @echo hi
</code></pre>

where the first character in the second line must be TAB.

blocks|key|321076|text|@echo+$(NDK_PROJECT_PATH)是一种很好的方法。我不认为错误来自那里。通常，当您输入错误的提示时，会出现此错误:我认为您应该有制表符的地方有空格。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|321077|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

@echo $(NDK_PROJECT_PATH) is the good way to do it.
I don't think the error comes from there.
Generally this error appears when you mistyped the intendation : I think you have spaces where you should have a tab.

blocks|key|321447|text|不需要修改Makefile。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|321448|$+cat+printvars.mak
print-%25:
++++++++@echo+'$*=$($*)'

$+cd+/to/Makefile/dir
$+make+-f+~/printvars.mak+-f+Makefile+print-VARIABLE|code-block|syntax|javascript|321449|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

No need to modify the Makefile.

<pre><code>$ cat printvars.mak
print-%:
 @echo '$*=$($*)'

$ cd /to/Makefile/dir
$ make -f ~/printvars.mak -f Makefile print-VARIABLE
</code></pre>

blocks|key|104169|text|运行make+-n；它将显示变量的值。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|104170|生成文件...|104171|all:
++++++++@echo+$(NDK_PROJECT_PATH)|code-block|syntax|javascript|104172|命令：|104173|export+NDK_PROJECT_PATH=/opt/ndk/project
make+-n+|104174|输出：|104175|echo+/opt/ndk/project|104176|entityMap^0|2|7|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Z|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|10|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|11|8|@]|D|@]|E|$]]|$1|O|3|P|5|J|7|12|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|13|8|@]|D|@]|E|$]]|$1|S|3|T|5|J|7|14|8|@]|D|@]|E|$K|L]]|$1|U|3|-4|5|6|7|15|8|@]|D|@]|E|$]]]|V|$]]

Run <code>make -n</code>; it shows you the value of the variable..

Makefile...

<pre><code>all:
 @echo $(NDK_PROJECT_PATH)
</code></pre>

Command:

<pre><code>export NDK_PROJECT_PATH=/opt/ndk/project
make -n 
</code></pre>

Output:

<pre><code>echo /opt/ndk/project
</code></pre>

blocks|key|104203|text|此makefile将生成“缺少分隔符”错误消息：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|104204|all
++++@echo+NDK_PROJECT_PATH=$(NDK_PROJECT_PATH)

done:
++++++++@echo+"All+done"|code-block|syntax|javascript|104205|在@echo+"All+done"之前有一个选项卡(尽管done:规则和操作在很大程度上是多余的)，但不是在@echo+PATH=$(PATH)之前。|104206|问题是，开始all的行应具有冒号:或等于=，以指示它是目标行或宏行，并且两者都没有，因此缺少分隔符。|104207|回显变量值的操作必须与目标关联，可能是虚拟目标或伪目标。并且目标行上必须有冒号。如果您在示例makefile中的all之后添加一个:，并用制表符替换下一行的前导空白，它将正常工作。|104208|您可能在原始makefile的第102行附近遇到了类似的问题。如果在回显操作失败之前显示了5行非空白、非注释行，则可能可以完成诊断。然而，由于这个问题是在2013年5月提出的，故障的makefile现在(2014年8月)不太可能仍然存在，所以这个答案不能被正式验证。它只能用来说明问题发生的一种合理方式。|104209|entityMap^0|1|8|0|0|1|G|S|5|1I|I|0|6|3|G|1|K|1|0|1A|8|1K|3|1T|1|0|6|8|2J|8|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|Y|8|@$9|Z|A|10|B|C]|$9|11|A|12|B|C]|$9|13|A|14|B|C]]|D|@]|E|$]]|$1|M|3|N|5|6|7|15|8|@$9|16|A|17|B|C]|$9|18|A|19|B|C]|$9|1A|A|1B|B|C]]|D|@]|E|$]]|$1|O|3|P|5|6|7|1C|8|@$9|1D|A|1E|B|C]|$9|1F|A|1G|B|C]|$9|1H|A|1I|B|C]]|D|@]|E|$]]|$1|Q|3|R|5|6|7|1J|8|@$9|1K|A|1L|B|C]|$9|1M|A|1N|B|C]]|D|@]|E|$]]|$1|S|3|-4|5|6|7|1O|8|@]|D|@]|E|$]]]|T|$]]

This <code>makefile</code> will generate the 'missing separator' error message:

<pre><code>all
 @echo NDK_PROJECT_PATH=$(NDK_PROJECT_PATH)

done:
 @echo "All done"
</code></pre>

There's a tab before the <code>@echo "All done"</code> (though the <code>done:</code> rule and action are largely superfluous), but not before the <code>@echo PATH=$(PATH)</code>.

The trouble is that the line starting <code>all</code> should either have a colon <code>:</code> or an equals <code>=</code> to indicate that it is a target line or a macro line, and it has neither, so the separator is missing.

The action that echoes the value of a variable must be associated with a target, possibly a dummy or PHONEY target. And that target line must have a colon on it. If you add a <code>:</code> after <code>all</code> in the example <code>makefile</code> and replace the leading blanks on the next line by a tab, it will work sanely.

You probably have an analogous problem near line 102 in the original <code>makefile</code>. If you showed 5 non-blank, non-comment lines before the echo operations that are failing, it would probably be possible to finish the diagnosis. However, since the question was asked in May 2013, it is unlikely that the broken <code>makefile</code> is still available now (August 2014), so this answer can't be validated formally. It can only be used to illustrate a plausible way in which the problem occurred.

blocks|key|321281|text|问题是echo只能在执行块下工作。即"xx:“之后的任何内容|type|unstyled|depth|inlineStyleRanges|entityRanges|data|321282|因此，第一个执行块以上的任何内容都只是初始化，因此不能使用任何执行命令。|321283|所以创建一个执行区块|321284|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

The problem is that echo works only under an execution block. i.e. anything after "xx:"

So anything above the first execution block is just initialization so no execution command can used.

So create a execution blocl

blocks|key|321363|text|如果不想修改Makefile本身，可以使用--eval添加一个新目标，然后执行新目标，例如|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|321364|make+--eval='print-tests:+++++++++@echo+TESTS+$(TESTS)+'+print-tests|321365|可以使用CTRL-V,+TAB在命令行中插入所需的制表符|321366|上面的Makefile示例：|321367|all:+do-something

TESTS=
TESTS%2B='a'
TESTS%2B='b'
TESTS%2B='c'

do-something:
++++++++@echo+"doing+something"
++++++++@echo+"running+tests+$(TESTS)"
++++++++@exit+1|code-block|syntax|javascript|321368|entityMap^0|L|6|0|0|1W|0|4|B|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|V|8|@$9|W|A|X|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|J|3|K|5|6|7|11|8|@]|D|@]|E|$]]|$1|L|3|M|5|N|7|12|8|@]|D|@]|E|$O|P]]|$1|Q|3|-4|5|6|7|13|8|@]|D|@]|E|$]]]|R|$]]

If you don't want to modify the Makefile itself, you can use <code>--eval</code> to add a new target, and then execute the new target, e.g.

<code>make --eval='print-tests:
 @echo TESTS $(TESTS)
' print-tests
</code>

You can insert the required TAB character in the command line using <code>CTRL-V, TAB</code>

example Makefile from above:

<pre><code>all: do-something

TESTS=
TESTS+='a'
TESTS+='b'
TESTS+='c'

do-something:
 @echo "doing something"
 @echo "running tests $(TESTS)"
 @exit 1
</code></pre>

blocks|key|104335|text|这可以通过一种通用的方式来完成，并且在调试复杂的makefile时非常有用。遵循与another+answer中所述的相同技术，您可以将以下内容插入到任何makefile中：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|104336|#+if+the+first+command+line+argument+is+"print"
ifeq+($(firstword+$(MAKECMDGOALS)),print)

++#+take+the+rest+of+the+arguments+as+variable+names
++VAR_NAMES+:=+$(wordlist+2,$(words+$(MAKECMDGOALS)),$(MAKECMDGOALS))

++#+turn+them+into+do-nothing+targets
++$(eval+$(VAR_NAMES):;@:))

++#+then+print+them
++.PHONY:+print
++print:
++++++++++@$(foreach+var,$(VAR_NAMES),\
++++++++++++echo+'$(var)+=+$($(var))';)
endif|code-block|syntax|javascript|104337|然后，您可以执行"make+print“来转储任何变量的值：|104338|$+make+print+CXXFLAGS
CXXFLAGS+=+-g+-Wall|104339|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/14061796/109744^0|15|E|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|Z|8|@]|9|@]|C|$]]|$1|K|3|L|5|F|7|10|8|@]|9|@]|C|$G|H]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]]]

This can be done in a generic way and can be very useful when debugging a complex makefile. Following the same technique as described in <a href="https://stackoverflow.com/a/14061796/109744">another answer</a>, you can insert the following into any makefile:

<pre><code># if the first command line argument is "print"
ifeq ($(firstword $(MAKECMDGOALS)),print)

 # take the rest of the arguments as variable names
 VAR_NAMES := $(wordlist 2,$(words $(MAKECMDGOALS)),$(MAKECMDGOALS))

 # turn them into do-nothing targets
 $(eval $(VAR_NAMES):;@:))

 # then print them
 .PHONY: print
 print:
 @$(foreach var,$(VAR_NAMES),\
 echo '$(var) = $($(var))';)
endif
</code></pre>

Then you can just do "make print" to dump the value of any variable:

<pre><code>$ make print CXXFLAGS
CXXFLAGS = -g -Wall
</code></pre>

blocks|key|104414|text|如果你使用android+make，@echo+$(NDK_PROJECT_PATH)将无法工作，如果你试图在android+make中打印变量，会出现***+missing+separator.++Stop."+this+answer错误|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|104415|NDK_PROJECT_PATH+:=+some_value
$(warning+$(NDK_PROJECT_PATH))|code-block|syntax|javascript|104416|这对我很管用|104417|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/9499993/402488^0|I|P|24|U|2Z|B|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|F|3|G|5|H|7|12|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|13|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|14|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

if you use android make (mka) <code>@echo $(NDK_PROJECT_PATH)</code> will not work and gives you error <code>*** missing separator. Stop."</code>
use <a href="https://stackoverflow.com/a/9499993/402488">this answer</a> if you are trying to print variables in android make

<pre><code>NDK_PROJECT_PATH := some_value
$(warning $(NDK_PROJECT_PATH))
</code></pre>

that worked for me

blocks|key|321247|text|您可以在make文件中创建一个vars规则，如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|321248|dispvar+=+echo+$(1)=$($(1))+;+echo

.PHONY:+vars
vars:
++++@$(call+dispvar,SOMEVAR1)
++++@$(call+dispvar,SOMEVAR2)|code-block|syntax|javascript|321249|这里有一些更健壮的方法来转储所有变量：gnu+make:+list+the+values+of+all+variables+(or+"macros")+in+a+particular+run。|offset|length|321250|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/7117978/gnu-make-list-the-values-of-all-variables-or-macros-in-a-particular-run^0|0|0|J|24|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

You could create a vars rule in your make file, like this:

<pre><code>dispvar = echo $(1)=$($(1)) ; echo

.PHONY: vars
vars:
 @$(call dispvar,SOMEVAR1)
 @$(call dispvar,SOMEVAR2)
</code></pre>

There are some more robust ways to dump all variables here: <a href="https://stackoverflow.com/questions/7117978/gnu-make-list-the-values-of-all-variables-or-macros-in-a-particular-run">gnu make: list the values of all variables (or &quot;macros&quot;) in a particular run</a>.

In my makefile, I have a variable 'NDK_PROJECT_PATH', my question is how can I print it out when it compiles?

I read <a href="https://stackoverflow.com/questions/3707517/make-file-echo-displaying-path-string">Make file echo displaying &quot;$PATH&quot; string</a> and I tried:

<pre><code>@echo $(NDK_PROJECT_PATH)
@echo $(value NDK_PROJECT_PATH)
</code></pre>

Both gives me 

<pre><code>"build-local.mk:102: *** missing separator. Stop."
</code></pre>

Any one knows why it is not working for me?

How to print out a variable in makefile

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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在我的makefile中，我有一个变量'NDK_PROJECT_PATH'，我的问题是，当它编译时，我如何打印它？我读了，我试着：@echo $(NDK_PROJECT_PATH)@echo $(value NDK_PROJECT_PATH)两者都给了我"build-local.mk:102: *** missing separator.  Stop."有人知道为什么它对我不起作用吗？

问如何在makefile中打印出变量
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问如何在makefile中打印出变量
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