[question] How to specify visible=False for tool_requires in a profile

[tkielan]

What is your question?

Hi,

I have a host profile with tool_requires for ccache. I do not want to put this neither into recipes nor into host profiles.
If I do that, all ccache dependencies go downstream as I see no way of specifying visible=False in conanfile.txt or in a profile.
The opposite situation is with conanfile.py, where I can use explicit parameter to tool_requires method to achieve this.

Have you read the CONTRIBUTING guide?

• I've read the CONTRIBUTING guide

[AbrilRBS]

Hi @tkielan thanks a lot for your question.

Note that tool_requires are already visible=False by default, so it's not clear to me what behaviour you're observing. Using ccache like this is a totally valid approach, and it's one of the recommended ways to use the new recipe being proposed in conan-io/conan-toolchains#2, and the dependency is not propagated downstream, as with any other tool requires.

Let me know if you can give me some more context, or if this was a misunderstanding about tool_requires, happy to help where possible :)

[tkielan]

You might be right, it is False according to the docs.
I have a weird behavior and was suspecting they got propagated downstream, but this might not be the case.

This one seems not valid anymore.

Just a quick question...
How to apply this in a profile to exclude ccache recipe itself:

[tool_requires]
ccache!: ccache/version

The ! keyword seems only documented for &!, but not to inverse any pattern.

[AbrilRBS]

To avoid ccache having a loop on itself, there are two approaches.

• The recommended one would be to only set the [tool_requires] section in the host profile.
  • Note that this can be done by adding an if using jinja syntax, see the branching section in https://docs.conan.io/2/reference/config_files/profiles.html#profile-rendering
• Your approach to exclude the recipe itself from applying the tool_requires, it's just that the negation should be done at the start of the pattern (And ideally, contain a version pattern), so like: !ccache/*: ccache/[*]

Let me know if this helps!

[AbrilRBS]

The ! keyword seems only documented for &!, but not to inverse any pattern.

I'll track this issue in the docs repo, see if we can improve that aspect.

Meanwhile, I'm closing this as solved, but please feel free to create new issues/reopen this if you have any other questions, thanks!