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Docs for compiler.cppstd subsetting #1266

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merged 5 commits into from May 3, 2019

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@jgsogo jgsogo commented Apr 30, 2019

Doc for conan-io/conan#4917

@ghost ghost assigned jgsogo Apr 30, 2019
@ghost ghost added the stage: review label Apr 30, 2019
@jgsogo jgsogo added this to the 1.15 milestone Apr 30, 2019

The setting representing the C++ standard is ``compiler.cppstd``.
The detected default profile doesn't set any value for the ``compiler.cppstd`` setting, but
Conan will use the default for each compiler if no value is provided.
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@lasote lasote May 3, 2019

Not accurate. Conan won't do anything if no value is specified. But the compiler will use, of course, the default value.

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@jgsogo jgsogo May 3, 2019

That's right, and very important!

By default Conan will detect the default standard of your compiler to not generate different binary packages.
For example, you already built some ``gcc > 6.1`` packages, where the default std is ``gnu14``.
If you introduce the ``cppstd`` setting in your recipes and specify the ``gnu14`` value, Conan won't generate
By default Conan will use the default standard for your compiler, so it won't generate different
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@lasote lasote May 3, 2019

Idem. Not accurate. You can say that when no value is specified, Conan will compute by default the same package_id corresponding to the default std of the compiler, so when you explicit the std value for the default of the compiler, the id will be the same as no specifying it.

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@jgsogo jgsogo May 3, 2019

That's right, and very important

@lasote lasote merged commit 02e0c4e into conan-io:develop May 3, 2019
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@ghost ghost removed the stage: review label May 3, 2019
@jgsogo jgsogo deleted the pr/4917-compiler-cppstd branch May 3, 2019
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3 participants