blocks|key|1144933|text|默认情况下，它首先处理第一个不是以.+(也称为the+default+goal)开头的目标；为此，它可能必须处理其他目标-具体地说，就是第一个目标所依赖的目标。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1144934|GNU+Make+Manual涵盖了所有这些内容，并且是一个令人惊讶的简单和内容丰富的读物。|1144935|entityMap|0|LINK|mutability|MUTABLE|url|https://www.gnu.org/software/make/manual/html_node/How-Make-Works.html|1|http://www.gnu.org/software/make/manual/^0|H|1|N|G|0|0|0|F|1|0^^$0|@$1|2|3|4|5|6|7|R|8|@$9|S|A|T|B|C]]|D|@$9|U|A|V|1|W]]|E|$]]|$1|F|3|G|5|6|7|X|8|@]|D|@$9|Y|A|Z|1|10]]|E|$]]|$1|H|3|-4|5|6|7|11|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]|P|$5|K|L|M|E|$N|Q]]]]

By default, it begins by processing the first target that does not begin with a <code>.</code> aka <a href="https://www.gnu.org/software/make/manual/html_node/How-Make-Works.html" rel="noreferrer">the default goal</a>; to do that, it may have to process other targets - specifically, ones the first target depends on.

The <a href="http://www.gnu.org/software/make/manual/" rel="noreferrer">GNU Make Manual</a> covers all this stuff, and is a surprisingly easy and informative read.

blocks|key|1144966|text|GNU+Make还允许您使用一个名为.DEFAULT_GOAL的特殊变量来指定默认的make目标。您甚至可以在Makefile中间取消设置此变量，从而使文件中的下一个目标成为默认目标。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1144967|参考：The+Gnu+Make+manual+-+Special+Variables|1144968|entityMap|0|LINK|mutability|MUTABLE|url|http://www.gnu.org/software/make/manual/make.html#Special-Variables^0|I|D|0|3|13|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|S|8|@]|D|@$9|T|A|U|1|V]]|E|$]]|$1|H|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]]]

GNU Make also allows you to specify the default make target using a special variable called <code>.DEFAULT_GOAL</code>. You can even unset this variable in the middle of the Makefile, causing the next target in the file to become the default target. 

Ref: <a href="http://www.gnu.org/software/make/manual/make.html#Special-Variables" rel="noreferrer">The Gnu Make manual - Special Variables</a>

blocks|key|1360075|text|为了节省其他人几秒钟的时间，并让他们不必阅读手册，这里有一个简短的答案。将此代码添加到make文件的顶部：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1360076|.DEFAULT_GOAL+:=+mytarget|code-block|syntax|javascript|1360077|如果执行了"make“并且没有指定目标，那么mytarget现在将成为运行的目标。|1360078|如果你有一个旧版本的make+(<=+3.80)，这将无法工作。如果是这种情况，那么您可以执行anon提到的操作，只需将以下代码添加到make文件的顶部：|1360079|.PHONY:+default
default:+mytarget+;|1360080|参考资料：https://www.gnu.org/software/make/manual/html_node/How-Make-Works.html|offset|length|1360081|entityMap|0|LINK|mutability|MUTABLE|url|https://www.gnu.org/software/make/manual/html_node/How-Make-Works.html^0|0|0|0|0|0|5|1Y|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|10|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|11|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|12|8|@]|9|@]|A|$E|F]]|$1|M|3|N|5|6|7|13|8|@]|9|@$O|14|P|15|1|16]]|A|$]]|$1|Q|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]]]

To save others a few seconds, and to save them from having to read the manual, here's the short answer. Add this to the top of your make file:

<pre><code>.DEFAULT_GOAL := mytarget
</code></pre>

mytarget will now be the target that is run if "make" is executed and no target is specified.

If you have an older version of make (&lt;= 3.80), this won't work. If this is the case, then you can do what anon mentions, simply add this to the top of your make file:

<pre><code>.PHONY: default
default: mytarget ;
</code></pre>

References:
<a href="https://www.gnu.org/software/make/manual/html_node/How-Make-Works.html" rel="noreferrer">https://www.gnu.org/software/make/manual/html_node/How-Make-Works.html</a>

blocks|key|1360126|text|相当于GNU+Make的.DEFAULT_GOAL的bmake是.MAIN|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1360127|$+cat+Makefile
.MAIN:+foo

all:
++++@echo+all

foo:
++++@echo+foo
$+bmake
foo|code-block|syntax|javascript|1360128|请参阅bmake(1)+manual+page。|1360129|entityMap|0|LINK|mutability|MUTABLE|url|https://www.freebsd.org/cgi/man.cgi?query=make&manpath=FreeBSD%2B13.0-RELEASE%2Band%2BPorts^0|C|D|W|5|0|0|3|K|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|Z|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|10|8|@]|D|@$9|11|A|12|1|13]]|E|$]]|$1|M|3|-4|5|6|7|14|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

bmake's equivalent of GNU Make's <code>.DEFAULT_GOAL</code> is <code>.MAIN</code>:
<pre><code>$ cat Makefile
.MAIN: foo

all:
 @echo all

foo:
 @echo foo
$ bmake
foo
</code></pre>
See the <a href="https://www.freebsd.org/cgi/man.cgi?query=make&amp;manpath=FreeBSD+13.0-RELEASE+and+Ports" rel="nofollow noreferrer">bmake(1) manual page</a>.

Most Linux apps are compiled with:
<pre><code>make
make install clean
</code></pre>
As I understand it, the <code>make</code> command takes names of build targets as arguments. So for example <code>install</code> is usually a target that copies some files to standard locations, and <code>clean</code> is a target that removes temporary files.
But what target will <code>make</code> build if no arguments are specified (e.g. the first command in my example)?

How does "make" app know default target to build if no target is specified?

Linux

大多数Linux应用程序都是使用以下命令编译的：makemake install clean据我所知，make命令将构建目标的名称作为参数。例如，install通常是将一些文件复制到标准位置的目标，而clean是删除临时文件的目标。但是，如果没有指定参数(例如，我示例中的第一个命令)，make将构建什么目标？

问如果没有指定目标，"make“应用程序如何知道要构建的默认目标？
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问如果没有指定目标，"make“应用程序如何知道要构建的默认目标？
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