in boost 1.87 io_service has been removed, use io_context instead

[stefanottili]

Describe the bug

Mac M1: brew upgrade upgraded boost from 1.86 to 1.87, now the compile fails with:

OpenROAD/src/dst/src/WorkerConnection.h:46:26: error: no type named 'io_service' in namespace 'boost::asio'
   46 |   WorkerConnection(asio::io_service& io_service,
      |                    ~~~~~~^

googling found this:

boost 1.87:

io_service was deprecated in favor of io_context back in 1.66.0 
(https://github.com/boostorg/asio/commit/b60e92b13ef68dfbb9af180d76eae41d22e19356).
Easiest approach is to require a minimum of Boost 1.66.0 and use newer APIs.
Otherwise, would need to create many #if BOOST_VERSION ... conditions for compatibility.

Expected Behavior

compile using boost 1.87

Environment

M1 Mac homebrew

To Reproduce

build using boost 1.87

Relevant log output

No response

Screenshots

No response

Additional Context

No response

[stefanottili]

I found that boost unlink/link allows cmake to find and use an older boost version.
brew unlink boost@1.87
brew link boost@1.85