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[feature] set jobs parameter in CMakePreset buildPresets to get parallel builds when invoking cmake after conan install #15419

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Hailios opened this issue Jan 9, 2024 · 1 comment · Fixed by #15422
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@Hailios
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Hailios commented Jan 9, 2024

What is your suggestion?

the generated CMakePresets.json does not contain the "jobs" parameter, making it default to 1 (at least sometimes).
when manually set to a higher number, the cmake build command builds in parallel as expected.
it would be good if Conan could set this parameter while generating the preset file(s).

example "buildPresets" section before this feature is implemented:

    "buildPresets": [
        {
            "name": "conan-relwithdebinfo",
            "configurePreset": "conan-relwithdebinfo"
        }
    ],

example "buildPresets" section with the proposed feature:

    "buildPresets": [
        {
            "name": "conan-relwithdebinfo",
            "configurePreset": "conan-relwithdebinfo",
            "jobs": 16
        }
    ],

this allows cmake to be invoked as follows, cmake --build --target all --preset conan-relwithdebinfo and have it build in parallel (much faster).

the issue was observed on Ubuntu 23.10

 $ lsb_release -a
Distributor ID:	Ubuntu
Description:	Ubuntu 23.10
Release:	23.10
Codename:	mantic

Conan version 2.0.14
cmake version 3.27.4

Have you read the CONTRIBUTING guide?

  • I've read the CONTRIBUTING guide
@memsharded
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Hi @Hailios

Thanks for your suggestion.
I think this could make sense, might be doable, I'll check with the team.

Hailios added a commit to Hailios/conan that referenced this issue Jan 9, 2024
@memsharded memsharded added this to the 2.1 milestone Jan 10, 2024
memsharded added a commit that referenced this issue Jan 10, 2024
* set jobs parameter in cmake build presets(#15419)

* import build_jobs directly instead of using scoping

* test

* fix, remove from testPresets

---------

Co-authored-by: memsharded <james@conan.io>
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2 participants