Please backport gcc-mingw-w64 20.2 (universe) from bionic-proposed

[michagogo]

Please backport gcc-mingw-w64 20.2 (universe) from bionic-proposed to xenial.

Reason for the backport:
========================
The version in Xenial is broken, resulting in broken results when building e.g. Bitcoin Core.

Testing:
========
Mark off items in the checklist [X] as you test them, but please leave the checklist so that backporters can quickly evaluate the state of testing.

You can test-build the backport in your PPA with backportpackage:
$ backportpackage -u ppa:<lp username>/<ppa name> -s bionic -d xenial gcc-mingw-w64

* xenial:
[ ] Package builds without modification
[ ] gnat-mingw-w64-i686 installs cleanly and runs
[ ] gnat-mingw-w64-i686-dbgsym installs cleanly and runs
[ ] g++-mingw-w64-x86-64 installs cleanly and runs
[ ] gobjc-mingw-w64 installs cleanly and runs
[ ] gcc-mingw-w64-base installs cleanly and runs
[ ] gnat-mingw-w64-x86-64 installs cleanly and runs
[ ] gobjc++-mingw-w64-x86-64-dbgsym installs cleanly and runs
[ ] gcc-mingw-w64-i686-dbgsym installs cleanly and runs
[ ] gfortran-mingw-w64 installs cleanly and runs
[ ] gobjc++-mingw-w64-i686-dbgsym installs cleanly and runs
[ ] gcc-mingw-w64-x86-64 installs cleanly and runs
[ ] gfortran-mingw-w64-i686 installs cleanly and runs
[ ] g++-mingw-w64-i686-dbgsym installs cleanly and runs
[ ] gcc-mingw-w64-i686 installs cleanly and runs
[ ] gnat-mingw-w64-x86-64-dbgsym installs cleanly and runs
[ ] g++-mingw-w64 installs cleanly and runs
[ ] gobjc++-mingw-w64-x86-64 installs cleanly and runs
[ ] gcc-mingw-w64-x86-64-dbgsym installs cleanly and runs
[ ] gobjc++-mingw-w64-i686 installs cleanly and runs
[ ] gobjc-mingw-w64-x86-64 installs cleanly and runs
[ ] gobjc++-mingw-w64 installs cleanly and runs
[ ] gnat-mingw-w64 installs cleanly and runs
[ ] gfortran-mingw-w64-x86-64 installs cleanly and runs
[ ] gfortran-mingw-w64-i686-dbgsym installs cleanly and runs
[ ] gobjc-mingw-w64-i686-dbgsym installs cleanly and runs
[ ] g++-mingw-w64-i686 installs cleanly and runs
[ ] gobjc-mingw-w64-i686 installs cleanly and runs
[ ] g++-mingw-w64-x86-64-dbgsym installs cleanly and runs
[ ] gcc-mingw-w64 installs cleanly and runs
[ ] gobjc-mingw-w64-x86-64-dbgsym installs cleanly and runs
[ ] gfortran-mingw-w64-x86-64-dbgsym installs cleanly and runs

Reverse dependencies:
=====================
The following reverse-dependencies need to be tested against the new version of gcc-mingw-w64. For reverse-build-dependencies (-Indep), please test that the package still builds against the new gcc-mingw-w64. For reverse-dependencies, please test that the version of the package currently in the release still works with the new gcc-mingw-w64 installed. Reverse- Recommends, Suggests, and Enhances don't need to be tested, and are listed for completeness-sake.

gnat-mingw-w64-i686
-------------------

gnat-mingw-w64-i686-dbgsym
--------------------------

g++-mingw-w64-x86-64
--------------------
* libnb-platform18-java
  [ ] xenial (Reverse-Build-Depends)

gobjc-mingw-w64
---------------

gcc-mingw-w64-base
------------------

gnat-mingw-w64-x86-64
---------------------

gobjc++-mingw-w64-x86-64-dbgsym
-------------------------------

gcc-mingw-w64-i686-dbgsym
-------------------------

gfortran-mingw-w64
------------------

gobjc++-mingw-w64-i686-dbgsym
-----------------------------

gcc-mingw-w64-x86-64
--------------------
* mingw-w64
  [ ] xenial (Reverse-Build-Depends-Indep)

gfortran-mingw-w64-i686
-----------------------

g++-mingw-w64-i686-dbgsym
-------------------------

gcc-mingw-w64-i686
------------------
* mingw-w64
  [ ] xenial (Reverse-Build-Depends-Indep)

gnat-mingw-w64-x86-64-dbgsym
----------------------------

g++-mingw-w64
-------------
* mingw-w64
  [ ] xenial (Reverse-Depends)

gobjc++-mingw-w64-x86-64
------------------------

gcc-mingw-w64-x86-64-dbgsym
---------------------------

gobjc++-mingw-w64-i686
----------------------

gobjc-mingw-w64-x86-64
----------------------

gobjc++-mingw-w64
-----------------

gnat-mingw-w64
--------------

gfortran-mingw-w64-x86-64
-------------------------

gfortran-mingw-w64-i686-dbgsym
------------------------------

gobjc-mingw-w64-i686-dbgsym
---------------------------

g++-mingw-w64-i686
------------------
* libnb-platform18-java
  [ ] xenial (Reverse-Build-Depends)
* android
  [ ] xenial (Reverse-Build-Depends)

gobjc-mingw-w64-i686
--------------------

g++-mingw-w64-x86-64-dbgsym
---------------------------

gcc-mingw-w64
-------------
* libz-mingw-w64
  [ ] xenial (Reverse-Build-Depends-Indep)
* mingw-w64-x86-64-dev
  [ ] xenial (Reverse-Breaks)
* mingw-w64
  [ ] xenial (Reverse-Depends)
* mingw-w64-i686-dev
  [ ] xenial (Reverse-Breaks)
* gdb-mingw-w64
  [ ] xenial (Reverse-Build-Depends-Indep)

gobjc-mingw-w64-x86-64-dbgsym
-----------------------------

gfortran-mingw-w64-x86-64-dbgsym
--------------------------------

[michagogo (michagogo)]

I tried to push this up to my PPA, but ran into dependency issues... It wants the following: binutils-mingw-w64-i686 (>= 2.28~), binutils-mingw-w64-x86-64 (>= 2.28~), g++-7, gcc-7-source (>= 7.2.0-20), gnat-7

I tried backporting binutils-mingw-w64 to the PPA, that then wanted binutils-source, which comes from src:binutils. When I tried binutils, I got a weird error:

# Pastebin dFgEDKXz
 dpkg-source -b binutils-xenial
dpkg-source: info: using source format '3.0 (quilt)'
dpkg-source: info: building binutils using existing ./binutils_2.30.orig.tar.xz
dpkg-source: info: building binutils in binutils_2.30-4ubuntu1~ubuntu16.04.1~ppa1.debian.tar.xz
dpkg-source: info: building binutils in binutils_2.30-4ubuntu1~ubuntu16.04.1~ppa1.dsc
 dpkg-genchanges -S -sa -v2.26.1-1ubuntu1~16.04.6 >../binutils_2.30-4ubuntu1~ubuntu16.04.1~ppa1_source.changes
dpkg-genchanges: warning: debian/changelog(l395): found change data where expected next heading or end of file
LINE: *
dpkg-genchanges: warning: debian/changelog(l7258): invalid abbreviated month name 'Sept'
LINE: -- Christopher C. Chimelis <email address hidden> Sat, 18 Sept 1999 01:21:05 -0400
dpkg-genchanges: warning: debian/changelog(l7258): cannot parse non-comformant date '18 Sept 1999 01:21:05 -0400'
LINE: -- Christopher C. Chimelis <email address hidden> Sat, 18 Sept 1999 01:21:05 -0400
dpkg-genchanges: warning: 'since' option specifies non-existing version
dpkg-genchanges: warning: use newest entry that is earlier than the one specified
dpkg-genchanges: error: unknown1 is not a valid version
dpkg-buildpackage: error: dpkg-genchanges gave error exit status 255
debuild: fatal error at line 1376:
dpkg-buildpackage -rfakeroot -d -us -uc -S -nc -sa -v2.26.1-1ubuntu1~16.04.6 failed
backportpackage: Error: debuild returned 29.

And when I tried g++-7, all kinds of other stuff started popping up, causing me to suspect that I'm going down a rabbit hole I shouldn't be. Is there something else I should be doing?

Thanks!

[michagogo (michagogo)]

Update: I tried pushing a backport from artful, and that only blocked on gcc-6. I found ppa:ubuntu-toolchain-r/test which has a gcc-6 for Xenial, and am now trying a build. Maybe this will work better?