Add support for upcoming Boost 1.87.0

[cho-m]

Issue Description

While testing the beta of upcoming Boost 1.87.0 in Homebrew (Homebrew/homebrew-core#198115), UHD failed to build due to using deprecated Boost Asio APIs that were removed, e.g. boostorg/asio@ec0908c

uhd/host/lib/deps/rpclib/include/rpc/detail/async_writer.h

Line 22 in 635ad36

async_writer(boost::asio::io_service *io,

This issue is mainly intended as advance notice. Boost 1.87.0 release is planned for December 11.

Setup Details

Homebrew build environment. Shouldn't be OS/arch specific. CI hit this on macOS 13-14 (x86_64), macOS 13-15 (arm64) and Ubuntu 22.04 (x86_64).

Expected Behavior

Successful build.

Actual Behaviour

Compilation fails with errors like:

host/lib/deps/rpclib/include/rpc/detail/async_writer.h:22:31: error: no type named 'io_service' in namespace 'boost::asio'
   22 |     async_writer(boost::asio::io_service *io,
      |                  ~~~~~~~~~~~~~^

Steps to reproduce the problem

Easiest way to reproduce may using CXXFLAGS=-DBOOST_ASIO_NO_DEPRECATED on Boost 1.66.0 - 1.86.0

An identical reproduction would be building recent 1.87.0.beta1.

Additional Information

Updating Boost minimum to 1.66.0 should allow replacing most/all deprecated APIs. If older Boost support is needed, then will require various #if BOOST_VERSION checks to support.

[mbr0wn]

Thanks for the report! Yes we want to support the upcoming Boost.

[mbr0wn]

@cho-m Thanks again for reporting. We just finished an internal review of the required changes, and they will go live soon. Next time we push UHD public, the master branch will have this fix, as will the next stable release of UHD.

We did in fact increase the minimum Boost version to 1.66, as you hinted.