Hi,

It seems there might be a misunderstanding regarding the go mod why 
command. Please note that any transitive dependencies will not be displayed 
in the output. For instance, x/exp/shiny could be a transitive dependency 
of a direct dependency in your main module, which is why you see the 
message "(main module does not need package golang.org/x/exp/shiny)."

To understand why dmitri.shuralyov.com/gpu/mtl is used by x/mobile, I 
recommend checking the source code of both x/mobile and x/exp/shiny.


Xudong

在2024年7月17日星期三 UTC+8 23:42:28<Alvaro Crespo> 写道:

> Hi!
>
> Sadly, "go mod why" doesn't really work for gomobile (
> https://cs.opensource.google/go/x/mobile) and its dependencies since they 
> are technically not used in my library/package. They are used at build time 
> to generate language bindings that make it possible to call Go functions 
> from Java and Objective-C.
>
> go mod why golang.org/x/exp/shiny 
>
> go: downloading golang.org/x/exp v0.0.0-20190731235908-ec7cb31e5a56
>
> # golang.org/x/exp/shiny
>
> (main module does not need package golang.org/x/exp/shiny)
>
> My doubt is: why is dmitri.shuralyov.com/gpu/mtl, a package for gpu use 
> and geometry rendering, listed as a dependency of 
> https://cs.opensource.google/go/x/mobile (a package to generate language 
> bindings to call Go functions from Java/Obj-C)? That doesn't sound right to 
> me. Given the widely known supply chain attacks this is something that 
> should be looked into, right?
>
>
>
> On Thu, Jul 11, 2024 at 9:04 PM Kurtis Rader <kra...@skepticism.us> wrote:
>
>> Try "go mod why $dependency"; e.g.,
>>
>> > go mod why github.com/sourcegraph/jsonrpc2
>> # github.com/sourcegraph/jsonrpc2
>> src.elv.sh/pkg/lsp
>> github.com/sourcegraph/jsonrpc2
>>
>> There's also "go mod graph". 
>>
>> On Thu, Jul 11, 2024 at 4:44 PM Alvaro Crespo <alvaro.and...@gmail.com> 
>> wrote:
>>
>>> Hi there!
>>>
>>> I'm not an expert go dev but I'm using 
>>> https://cs.opensource.google/go/x/mobile to build a domain layer for 
>>> both an Android and an iOS app. First of all, congrats on the good work. 
>>> The project is amazing.
>>>
>>> I recently updated the gomobile package version and found out a strange 
>>> looking new addition to my go.sum. Namely, this one:
>>>
>>> dmitri.shuralyov.com/gpu/mtl v0.0.0-20221208032759-85de2813cf6b/go.mod 
>>> h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
>>>
>>> I researched a bit and found out Dmitri (great job!) and his package (
>>> https://dmitri.shuralyov.com/gpu/mtl). But from the description it 
>>> doesn't look like something the gomobile project would need to use:
>>>
>>> Package mtl provides access to Apple's Metal API (
>>> https://developer.apple.com/documentation/metal).
>>> (...)
>>> This package is in very early stages of development. The API will change 
>>> when opportunities for improvement are discovered; it is not yet frozen. 
>>> Less than 20% of the Metal API surface is implemented. Current 
>>> functionality is sufficient to render very basic geometry.
>>>
>>> Is this ok? Using *go mod graph*it appears this is a dependency of 
>>> *golang.org/x/exp/shiny 
>>> <http://golang.org/x/exp/shiny>,*  which I'm also not entirely sure why 
>>> its included as a whole.
>>>
>>> Is this something that should be reported? I would love some 
>>> clarification on this.
>>>
>>>
>>> -- 
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>>>  
>>> <https://groups.google.com/d/msgid/golang-nuts/aaa96093-696e-469a-895e-9cb99c82fc58n%40googlegroups.com?utm_medium=email&utm_source=footer>
>>> .
>>>
>>
>>
>> -- 
>> Kurtis Rader
>> Caretaker of the exceptional canines Junior and Hank
>>
>

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