[Bug 1873406] Re: EpicsHostArch script does not detect recent MSYS2/MinGW setups on Windows

[Ralph Lange via Core-talk <core-talk at aps.anl.gov>]

Your proposal is actually not producing the correct output.

On a plain MSYS2 system without any of the MinGW toolchains configured
(that's the third icon "MSYS2 shell" the installer creates) setting the
EPICS Host arch to any of the MinGW variants will not work. Plain MSYS2
is not an EPICS supported platform.

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https://bugs.launchpad.net/bugs/1873406

Title:
  EpicsHostArch script does not detect recent MSYS2/MinGW setups on
  Windows

Status in EPICS Base:
  New
Status in EPICS Base 3.15 series:
  New
Status in EPICS Base 7.0 series:
  New

Bug description:
  On MSYS2/MinGW installations, the EpicsHostArch script does not
  recognize the host platform correctly.

  64bit:
  $ ./startup/EpicsHostArch
  lib/perl/EpicsHostArch.pl: Architecture 'x86_64-msys-thread-multi' not recognized

  32bit:
  $ ./startup/EpicsHostArch
  lib/perl/EpicsHostArch.pl: Architecture 'x86_64-msys-thread-multi' not recognized

  Which is not surprising, as the underlying MSYS2 subsystem is the
  same, and the difference is in the environment settings that point to
  the appropriate toolchain.

  64bit:
  $ echo $PATH
  /mingw64/bin:/usr/local/bin:/usr/bin:/bin:/c/Windows/System32:/c/Windows:/c/Windows/System32/Wbem:/c/Windows/System32/WindowsPowerShell/v1.0/:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl
  $ printenv | grep MSYSTEM
  MSYSTEM_CARCH=x86_64
  MSYSTEM_CHOST=x86_64-w64-mingw32
  MSYSTEM_PREFIX=/mingw64
  MSYSTEM=MINGW64

  32bit:
  $ echo $PATH
  /mingw32/bin:/usr/local/bin:/usr/bin:/bin:/c/Windows/System32:/c/Windows:/c/Windows/System32/Wbem:/c/Windows/System32/WindowsPowerShell/v1.0/:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl
  $ printenv | grep MSYSTEM
  MSYSTEM_CARCH=i686
  MSYSTEM_CHOST=i686-w64-mingw32
  MSYSTEM_PREFIX=/mingw32
  MSYSTEM=MINGW32

  
  NB: I am impressed by the clarity and simplicity of MSYS2 / MinGW

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