[llvm-dev] libOption

PaweĊ‚ Bylica via llvm-dev llvm-dev at lists.llvm.org
Wed Apr 20 08:42:48 PDT 2016


Can the cl::opt be used in the way where all options from LLVM libraries
are not exposed by default? I used it for a small project where I try to
avoid dependencies other than LLVM. The issue is the result of `my-project
-help` is a mix of my options and LLVM options.

On Wed, Apr 20, 2016 at 10:29 AM Russell Wallace via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Okay, that makes sense, thanks. I'll go with cl::opt, then.
>
> On Wed, Apr 20, 2016 at 8:08 AM, Sean Silva <chisophugis at gmail.com> wrote:
>
>> libOption's key feature is being able implement command line parsing
>> compatible with basically any program under the sun. For example, you have
>> control over distinguishing between `-foo` and `--foo` if you need that.
>> It is used in clang for command line parsing compatible cl.exe and gcc.
>> In LLD it is used for command line option parsing compatible with
>> link.exe, gnu ld, and ld64.
>> If you're writing a program from scratch, this is probably too
>> heavyweight and not the right choice (e.g. it involves running a TableGen
>> step as part of your build).
>>
>> On the other hand, cl::opt has its oddities. But overall cl::opt is a
>> reasonable basic option parsing library I would say. If you just need some
>> basic option parsing, already have LLVM as a dependency, and don't want to
>> roll your own option parsing, it is probably a decent choice.
>>
>> Overall I would not consider LLVM to provide a general purpose "option
>> parsing" solution. But cl::opt is the closest thing we have.
>>
>> -- Sean Silva
>>
>> On Tue, Apr 19, 2016 at 5:47 AM, Russell Wallace via llvm-dev <
>> llvm-dev at lists.llvm.org> wrote:
>>
>>> I'm given to understand that the recommendation these days is to use
>>> libOption instead of cl::opt, on the grounds that it has a number of
>>> advantages including more control of which options are made available.
>>>
>>> Is there any information available on how to use libOption, any
>>> documentation or example programs? Do any existing programs use it except
>>> the clang driver programs? Those customise their commandline handling
>>> heavily enough that it's hard to use them as examples.
>>>
>>> _______________________________________________
>>> LLVM Developers mailing list
>>> llvm-dev at lists.llvm.org
>>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>>>
>>>
>>
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