llvm dev - May 2013 - [LLVMdev] CommandLine: using cl::Positional with enum

Hi,

I've been trying to code through CommandLine the options I want my tool
accepts, but I find find quite impossible to achieve robustly what I need.

Look, I want the tool accepts a list of arguments in a particular order. For
this goal, I know the cl::Positional flag. But, the problem is that the first
argument must be one of a set of options. In my case, only the three next
commands are possible:

myTool option1
myTool option2  arg1  arg2
myTool option3  arg1

and I don't want a different order is possible, for instance, this is not
permitted:
myTool arg2 option2 arg1
So, I thought about using an enum for this first argument:

enum OptLevel{
 option1, option2, option3
};

cl::opt<OptLevel> OptionsLevel(cl::Positional, cl::desc("Choose one
of these options:"),
  cl::values(
    clEnumVal(option1, "..."),
    clEnumVal(option2, "..."),
    clEnumVal(option3, "..."),
    clEnumValEnd)
);

After that, the rest of arguments are also particular of the option selected as
the first argument, i.e, the rest of arguments are related with the first one.
So I thought I could independently parse these arguments with:

cl::list<std::string>  Argv (cl::ConsumeAfter, cl::desc("<program
arguments>..."));

But, doing this when I run:
myTool option1 file.cpp --
I got the next error:

"error - this positional option will never be matched, because it does not
Require a value and a cl::ConsumeAfter option is active!"

So, I modify "OptionsLevelOptionsLevel" including the cl::Required
flagThe error is now:

"option: does not allow a value! option1 specified.
option: must be specified at least once!
option: must be specified at least once!
option: must be specified at least once!"

Then, I decided to use cl::PositionalEatsArgs instead of cl::ConsumeAfter. Then,
this is the result:

"option: does not allow a value! option1 specified."

But, this time, the program continues. However, if I run "myTool option3
arg1 file.cpp --" it
gives me a different problem:

"warning: ../build/arg1: 'linker' input unused

error: unable to handle compilation, expected exactly one compiler job in '
'"

But the program still goes on.

Is there a way to accomplish what I have explained? I don't want those
errors and warnings.

Thanks,

Pedro.

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