https://fedoraproject.org/wiki/Changes/F37MingwUCRT
== Summary ==
This proposal is to add the UCRT target & support from Fedora to the
MinGW cross-toolchains.
== Owner ==
* Name: [[User:elmarco| Marc-André Lureau]]
* Email: marcandre.lureau(a)redhat.com
== Detailed Description ==
The current mingw32 and mingw64 cross-toolchains provided by Fedora
target the MSVCRT (Microsoft Visual C++ Runtime). Since Visual Studio
15 & Windows 10, the default and recommended runtime is UCRT. See also
[
https://www.msys2.org/docs/environments/#msvcrt-vs-ucrt MSVCRT vs
UCRT].
A new toolchain target triple `x86_64-w64-mingw32ucrt` and associated
binaries will be added.
Fedora MinGW macros will be provided to target UCRT, with ucrt64-*
prefix (ex: `ucrt64-meson`)
mingw-* libraries will be progressively adjusted to add the produced
ucrt64-* binaries.
Since mingw-*.spec are very repetitive and cumbersome to modify (each
mingw32, mingw64, ucrt package has to be defined manually, and this is
tedious and error-prone), a custom MinGW/Fedora tool or solution will
be proposed. In the meantime, packages can be modified to add manually
the new target.
[
https://lists.fedoraproject.org/archives/list/mingw@lists.fedoraproject.o...
UCRT plans on mingw(a)lists.fedoraproject.org ]
== Benefit to Fedora ==
This change will allow to cross-compile projects to Windows with the
up to date C runtime & headers, and better c99 support. This should
allow to more easily mix binaries produced from different versions or
compilers as well.
== Scope ==
* Proposal owners:
** update the mingw filesystem, binutils, headers, gcc & winpthreads packages
** bootstrap the new toolchain
** propose a solution to simplify library packaging with the different targets
** update some common library packages, such as mingw-zlib
* Other developers:
** Progressively adjust the mingw-* packages to produce ucrt64-
packages, following the updated guidelines.
* Release engineering:
* Policies and guidelines:
https://fedoraproject.org/wiki/Packaging:MinGW packaging guideline
will be adjusted.
* Trademark approval: N/A (not needed for this Change)
* Alignment with Objectives:
== Upgrade/compatibility impact ==
None
== How To Test ==
<pre>
$ x86_64-w64-mingw32ucrt-gcc test.c
$ /usr/bin/mingw-objdump -p a.exe | grep DLL
vma: Hint Time Forward DLL First
DLL Name: KERNEL32.dll
DLL Name: api-ms-win-crt-time-l1-1-0.dll
DLL Name: api-ms-win-crt-math-l1-1-0.dll
DLL Name: api-ms-win-crt-runtime-l1-1-0.dll
DLL Name: api-ms-win-crt-environment-l1-1-0.dll
DLL Name: api-ms-win-crt-private-l1-1-0.dll
DLL Name: api-ms-win-crt-heap-l1-1-0.dll
DLL Name: api-ms-win-crt-locale-l1-1-0.dll
DLL Name: api-ms-win-crt-stdio-l1-1-0.dll
DLL Name: api-ms-win-crt-string-l1-1-0.dll
</pre>
== User Experience ==
Windows binaries produced by Fedora cross-toolchain will target a more
modern and compatible C runtime, bringing hopefully better
compatibility & safety.
== Dependencies ==
None
== Contingency Plan ==
* Contingency mechanism: N/A (not a System Wide Change)
* Contingency deadline: N/A (not a System Wide Change)
* Blocks release? No (not a System Wide Change)
== Documentation ==
N/A (not a System Wide Change)
== Release Notes ==
The new MinGW toolchain and tools are available to compile binaries
targeting the Windows UCRT.
--
Ben Cotton
He / Him / His
Fedora Program Manager
Red Hat
TZ=America/Indiana/Indianapolis