下面的命令在Windows上为我做了这件事:

Path | tr ; "\n"

@echo $(NDK_PROJECT_PATH)是一个很好的方法。 我不认为错误来自这里。 通常，当您键入错误的意图时，会出现此错误:我认为您在应该有制表符的地方有空格。

运行make -n;它告诉你变量的值。

Makefile……

all:
        @echo $(NDK_PROJECT_PATH)

命令:

export NDK_PROJECT_PATH=/opt/ndk/project
make -n 

输出:

echo /opt/ndk/project

来自“Mr. Make post” https://www.cmcrossroads.com/article/printing-value-makefile-variable

在Makefile中添加以下规则:

print-%  : ; @echo $* = $($*)

然后，如果你想找出makefile变量的值，只需:

make print-VARIABLE

它会返回:

VARIABLE = the_value_of_the_variable

如果您只是想要一些输出，则需要单独使用$(info)。你可以在Makefile的任何地方这样做，它会显示这一行何时被求值:

$(info VAR="$(VAR)")

将输出VAR="<值的VAR>"每当make处理该行。这种行为非常依赖于位置，所以你必须确保$(info)展开发生在所有可以修改$(VAR)的事情已经发生之后!

一个更通用的选项是创建一个特殊的规则来打印变量的值。一般来说，规则是在变量赋值之后执行的，因此这将显示实际使用的值。(尽管规则可以改变变量。)良好的格式将有助于阐明变量的设置，而$(flavor)函数将告诉您某个变量的类型。所以在这个规则中:

print-% : ; $(info $* is a $(flavor $*) variable set to [$($*)]) @true

$* expands to the stem that the % pattern matched in the rule. $($*) expands to the value of the variable whose name is given by by $*. The [ and ] clearly delineate the variable expansion. You could also use " and " or similar. $(flavor $*) tells you what kind of variable it is. NOTE: $(flavor) takes a variable name, and not its expansion. So if you say make print-LDFLAGS, you get $(flavor LDFLAGS), which is what you want. $(info text) provides output. Make prints text on its stdout as a side-effect of the expansion. The expansion of $(info) though is empty. You can think of it like @echo, but importantly it doesn't use the shell, so you don't have to worry about shell quoting rules. @true is there just to provide a command for the rule. Without that, make will also output print-blah is up to date. I feel @true makes it more clear that it's meant to be a no-op.

运行它，你得到

$ make print-LDFLAGS
LDFLAGS is a recursive variable set to [-L/Users/...]

根据GNU制作手册以及下面答案中的“bobbogo”所指出的， 你可以使用info / warning / error来显示文本。

$(error   text…)
$(warning text…)
$(info    text…)

要打印变量，

$(error   VAR is $(VAR))
$(warning VAR is $(VAR))
$(info    VAR is $(VAR))

'error'将在显示错误字符串后停止make执行