'=' 的转义字符是什么？ GNU make 中的符号？
我想通过将环境变量 CPU_TYPE 及其值 -mcpu=603 作为命令行参数传递给该 makefile 来调用 makefile。我正在输入以下命令
make -f make_file CPU_TYPE=-mcpu=603
但它给出了错误，因为环境变量值具有 = 符号。如何在环境值中转义这个等号。
注意：我无法在 make_file 中添加此环境变量或任何其他变量。我必须仅将其作为命令行参数传递。
I want to call a makefile by passing the environment variable CPU_TYPE and its value -mcpu=603 as command line argument to that makefile. I am entering the below command
make -f make_file CPU_TYPE=-mcpu=603
But its given error because environment variable value is having = symbol. How to escape this equal symbol in the environment value.
Note : I cant add this environment variable or any other variable inside make_file. I have to pass it as command line arugments only.
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不太可能
应该不会有任何问题，但也许您遇到了很少使用的 shell 功能。
如果您在正在运行的 shell 中使用
set -k或使用sh -k运行 shell，它会将任何看起来像环境变量的内容视为环境变量。您可能已经知道，C shell 系列以外的 shell 可以通过在命令之前添加环境变量来为单个命令设置环境变量：
命令本身会看到修改后的环境； shell 对
cmdname的搜索不会改变。但是，在set -k生效后，任何看起来像环境变量的变量都会被视为环境变量：例如，您可以使用
env作为命令来验证这一点。有充分的理由（例如 dd 命令）不将此设置为默认行为。反对这个假设
反对这个假设，我不知道有哪个 shell 会反对环境值中的“
=”。如果有这样的限制，那就太麻烦了。普通 GNU Make 是可以的
但是，我可以这样做：
并且，在
set -k生效的情况下，我还可以这样做：在这两种情况下，编译都会采用通过命令行指定的值覆盖 makefile 中的设置。
make看不到单引号；当然，它们会被外壳去除。你完全可以忽略它们，我得到相同的结果。我在 MacOS X 上使用 bash 运行，但我希望在任何使用任何标准 POSIX-ish shell（Bourne、Korn、Bash）的类 Unix 系统上得到相同的结果。Improbable possibility
There shouldn't be any problem, but maybe you are running afoul of a seldom-used shell feature.
If you use
set -kin a running shell, or usesh -kto run a shell, it will treat anything that looks like an environment variable as an environment variable.You probably already know that shells other than the C shell family can set an environment variable for a single command by adding it before the command:
The command itself sees the modified environment; the shell's search for
cmdnameis not altered. However, withset -kin effect, anything that looks like an environment variable is treated as one:You can validate this by using
env, for example, as the command. There are sound reasons (such as theddcommand) for not making this the default behaviour.Against the hypothesis
Against this hypothesis, I don't know of a shell that objects to the '
=' in the environment value. It would be a nuisance if there was such a restriction.Plain GNU Make is OK
However, I'm able to do:
and, with
set -kin effect, I can also do:In both cases, the compilation takes the value specified via the command line as overriding what is set in the makefile.
The single quotes aren't seen by
make; they are removed by the shell, of course. You can perfectly well omit them and I get the same result. I'm running usingbashon MacOS X, but I'd expect the same results on any Unix-like system using any of the standard POSIX-ish shells (Bourne, Korn, Bash).尝试用\=代替=。 本教程显示您提供了一些示例，但不包含如何转义等号。
try \= instead of =. this tutorial shows you some examples but dosnt contain how to escape the equal symbol.
我不确定是否有直接的方法来实现你想要的。
但也许您可以修改您的Makefile，以便它通过例如读取文件来设置
CPU_TYPE。您可以在make_file中放入类似的内容，然后使用eg创建一个文件
my603.cputype，最后运行 make 作为
I'm not sure there is a direct way to achieve what you want.
But perhaps you might modify your Makefile so that it sets the
CPU_TYPEby e.g. reading a file. You might put in yourmake_filesomething likeand then create a file
my603.cputypewith e.g.and finally run make as