[boost] PSA: C++11 libraries need to update their libraries.json and CMakeLists.txt

[Peter Dimov via Boost]

Libraries that now require C++11, such as Atomic, TypeIndex, LexicalCast,
need to update their libraries.json files to now state "cxxstd": 11, and
to add the C++11 requirement to their CMakeLists.txt files, e.g.

target_compile_features(boost_lexical_cast INTERFACE cxx_std_11)

boostdep --cmake looks at libraries.json and automatically adds the
above requirement, so for generated CMakeLists.txt files (such as the
one in lexical_cast), a simple regeneration with e.g.
`boostdep --cmake lexical_cast` will suffice.

Note that cxx_std_11 requires CMake 3.8, so the
cmake_minimum_required line may need to be adjusted as well.

(`boostdep --cmake` does that automatically.)



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[Zach Laine via Boost]

Could you clarify why this is happening for these libs in particular?
Not a complaint; just curious.

Zach

[Peter Dimov via Boost]

Zach Laine wrote:
> Could you clarify why this is happening for these libs in particular?
> Not a complaint; just curious.

Sorry, why what is happening?

[Zach Laine via Boost]

I'm just curious why these three libraries are needing a change to
their libraries.json files. Was it just an oversight that should have
been done along with a code change, or was there some other reason?

Zach

On Mon, Oct 2, 2023 at 10:54 AM Peter Dimov via Boost

[Peter Dimov via Boost]

Zach Laine wrote:
> I'm just curious why these three libraries are needing a change to
> their libraries.json files. Was it just an oversight that should have
> been done along with a code change, or was there some other reason?

It's not just these three libraries; any library that increases its
minimal requirement should do that. I'm just listing these as
examples.