On Mon, Mar 11, 2019 at 10:40 AM Marshall Clow <mclow.lists@gmail.com> wrote:
A new release candidates for the first 1.70.0 beta release are now available at:

    
Changes since RC2:
* Relative paths for --prefix, --libdir, etc. are now bound relative
to the current working directory, instead of being relative to the Jamfile. Thanks to Tom Kent for the report, and Steven and Peter for the fixes.

Changes since RC1:
* The Jamfile for Boost.Predef has been updated to allow running the tests from /status. Thanks to mike.dev@gmx.de for the report, and to Rene for the fix.

The release notes are not yet available.

The SHA256 checksums are as follows:

dbf89645e509acb2e53eac3c633834f1dec80bd8622e6e652a9741dcf0807f17  ./boost_1_70_0_b1_rc3.7z
957b984b58656a3ec00661ecad7ef82e3a094bad36e37b9e6624843237854679  ./boost_1_70_0_b1_rc3.tar.bz2
76d149c1fb9e8a5ceb3bc1e5587edc40fa79a43e8b990d877c2210f0382b9421  ./boost_1_70_0_b1_rc3.tar.gz
71e990b2c26880521fd98459b184ee172ce1c46dcf554b6eaab7776b8b6369a6  ./boost_1_70_0_b1_rc3.zip

As always, the release managers would appreciate it if you download
the candidate of your choice and give building it a try. Please report
both success and failure, and anything else that is noteworthy.

I got tired of the 'register' warnings in the python headers, and added '-Wno-register' to my user-config.jam.
Given that, I have successfully built this with the following configurations.

Mac OS X 10.14.3 with Apple LLVM version 10.0.0 (clang-1000.10.44.4):
Successful build with C++03/11/14/17/2a

Mac OS X 10.11.6 with Apple LLVM version 8.0.0
Successful build with C++03/11/14/1z

Mac OS X 10.11.6 with clang built from trunk:
Successful build with C++03/11/14/17/2a

Ubuntu 18.04 with gcc 7.3.2:
Successful build with C++03/11/14/17

Ubuntu 18.04 with clang built from trunk:
Successful build with C++03/11/14/17/2a

-- Marshall