[mpich-announce] Announcing the availability of MPICH 3.4a2

[Raffenetti, Kenneth J.]

A new preview release of MPICH, 3.4a2, is now available for download. 
This release previews the 3.4 major series. In the 3.4 series, ch4 
replaces ch3 as the default device configuration.

Also in this release are several bug fixes and improvements in ch3, 
hydra, and common MPICH code. You can find the release on our downloads 
page (https://www.mpich.org/downloads/).

Regards,
The MPICH team

===============================================================================
                                Changes in 3.4
===============================================================================

# ch4 replaces ch3 as the default device configuration. Users must
   select a netmod in order to build ch4, else configure will prompt
   the user to choose.

# Further improvements to ch4 business card exchange: extra
   long address support and fixes for PMIx integration.

# Un-inline non-critical ch4 code for improved build times.

# Add DAOS ADIO driver to ROMIO (contributed by Intel).

# Add support for Arm compiler toolchain

# Add support for flang/f18 Fortran compiler

# Remove mxm, llc, and portals4 netmods from ch3.

# Remove support for logical reduction operations on floating point
   types.

# Remove MPIX_Mutex interfaces.

# Fix several test program bugs.

# Fix several static analysis and compiler warnings.

   A full list of changes is available at the following link:

     https://github.com/pmodels/mpich/compare/v3.3...v3.4a2