boost::serialization from the boost 1.74 library fails to compile on AppleClang

[jngrad]

Description
brew install boost install boost 1.74, which is not compatible with the AppleClang 12 compiler. Compiling C++ code containing a include to boost::serialization headers can fail with error: explicit specialization of undeclared template struct 'version'. Can be solved by rolling back to boost 1.73.

Area for Triage:

Question, Bug, or Feature?:
Bug

Virtual environments affected

• Ubuntu 16.04
• Ubuntu 18.04
• Ubuntu 20.04
• macOS 10.15
• macOS 11.0
• Windows Server 2016 R2
• Windows Server 2019

Expected behavior
brew install boost boost-mpi should install a boost version other than 1.74.
brew install [email protected] [email protected] should install the 1.73 version.

Actual behavior
brew install boost boost-mpi install the 1.74 version, which cannot compile with AppleClang: run 1322746536.
The previous version of boost available until today was 1.73, but cannot be installed anymore: run 1322911956, run 1322700474.

Repro steps

1. run brew install boost boost-mpi
2. compile any .cpp file containing #include <boost/serialization/optional.hpp> with AppleClang

Here is a minimal project: jngrad/espresso@boost174-appleclang12. The GitHub Action fails.

The regression was introduced in the boost 1.74 library and will probably get fixed in 1.75. See tickets boostorg/serialization#210 and boostorg/serialization#217. Here are links to the MWE that passes with 1.73 and fails with 1.74.

[maxim-lobanov]

@jngrad Hello,
Could you please clarify what is the issue with GitHub Actions images? We don't provide boost on MacOS images and don't control version that is installed from brew.

[jngrad]

We don't provide boost on MacOS images and don't control version that is installed from brew.

My mistake. Ticket can be closed. Sorry for the inconvenience!

[maxim-lobanov]

Sure, no problem.
I suggest reporting this issue to brew or boost team. Probably they can provide formula for 1.73 separately from 1.74