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Fedora 31 System-Wide Change proposal: MinGW environment and toolchain update

<a href="https://fedoraproject.org/wiki/Changes/MingwEnvToolchainUpdate" title="https://fedoraproject.org/wiki/Changes/MingwEnvToolchainUpdate">https://fedoraproject.org/wiki/Changes/MingwEnvToolchainUpdate</a>

== Summary ==
Update the MinGW base environment and toolchain to the latest upstream
stable releases.

== Owner ==
* Name: [[User:smani|Sandro Mani]]
* Email: <a href="mailto: ... at gmail dot com"> ... at gmail dot com</a>

== Detailed Description ==

The following packages will be updated

* mingw-gcc to version 9.1.0
* mingw-w64-tools to version 6.0.0
* mingw-winpthreads to version 6.0.0
* mingw-crt to version 6.0.0
* mingw-headers to version 6.0.0
* mingw-binutils to version 2.32

Packages for early testing are available here:
<a href="https://copr.fedorainfracloud.org/coprs/smani/mingw-gcc9/builds/" title="https://copr.fedorainfracloud.org/coprs/smani/mingw-gcc9/builds/">https://copr.fedorainfracloud.org/coprs/smani/mingw-gcc9/builds/</a>

== Benefit to Fedora ==

Ship the latest available MinGW environment and GNU toolchain.

== Scope ==
* Proposal owners:
The above mentioned packages will be updated. Build failures following
the mass rebuild will be inspected.

* Other developers:
Help with build failures may be requested.

* Release engineering: Impact check [https://pagure.io/releng/issues/8340]
* Release engineering: Mass rebuild requested
* Policies and guidelines: No policies need to be changed

== Upgrade/compatibility impact ==
No impact

== How To Test ==
Update the system once the updated packages land, look out for new
build failures etc.

== User Experience ==
The features of the newest MinGW environment and GNU Toolchain will be
available to the users.

== Dependencies ==
None

== Contingency Plan ==
* Contingency mechanism: Revert to older versions of environment /
toolchain, mass rebuild mingw packages again
* Contingency deadline: Before release
* Blocks release? Yes
* Blocks product? No

== Documentation ==
* <a href="http://gcc.gnu.org/gcc-9/" title="http://gcc.gnu.org/gcc-9/">http://gcc.gnu.org/gcc-9/</a>
* <a href="https://mingw-w64.org/doku.php/versions" title="https://mingw-w64.org/doku.php/versions">https://mingw-w64.org/doku.php/versions</a>

== Release Notes ==
Fedora 31 comes with the mingw-w64-6.0.0 environment, mingw-gcc-9.1
and mingw-binutils 2.32.