Makefile:7: target ( given more than once in the same rule

Question

im not familiar with make system. when i tried to execute the program like below, there is no problem: ``` ./prog.out arg1 arg2 arg3 ``` when i decided to it with make, i added the following script to makefile ``` parse ${parameters}: ./prog.out ${parameters} ``` its strange when the this works well; ``` make parse parameters="aaa bbb ccc" ``` and these characters: '(' and ')' generates errors! ``` make parse parameters="( d , ( d , ( d , d ) ) )" Makefile:7: target `(' given more than once in the same rule. Makefile:7: target `d' given more than once in the same rule. Makefile:7: target `,' given more than once in the same rule. Makefile:7: target `(' given more than once in the same rule. Makefile:7: target `d' given more than once in the same rule. Makefile:7: target `,' given more than once in the same rule. Makefile:7: target `d' given more than once in the same rule. Makefile:7: target `)' given more than once in the same rule. Makefile:7: target `)' given more than once in the…

Accepted Answer

```
parse ${parameters}:
     ./prog.out ${parameters}
```

The above makefile snippet creates a target named `parse` and one for each word in the expansion of the variable `parameters`.

So in your invocation `make parse parameters="aaa bbb ccc"` the line expands to `parse aaa bbb ccc:` and you end up defining four targets `parse`, `aaa`, `bbb` and `ccc`.

With the invocation `make parse parameters="( d , ( d , ( d , d ) ) )"` it expands to `parse ( d , ( d , ( d , d ) ) ):` and you define the targets `parse,`d`,`(`,`,`and`)`with`d`being listed four times,`,`three times,`(`three times` and `)` three times. (Which is why make complains about the targets being redefined.

If you just want `parameters` used as a variable in the command that is run then you don't need it in the target line at all.

```
parse:
     ./prog.out "${parameters}"
```

and then use

```
make parse parameters="aaa bbb ccc
```

or

```
make parse parameters="( d , ( d , ( d , d ) ) )"
```

Makefile:7: target ( given more than once in the same rule

Solution

Problem