Issue Details

Number

30210

Title

build: use UCRT runtime for Windows (release) binaries

Description

Switching to the modern runtime would be good, because the old runtime is missing features, which has meant writing workarounds for Windows in our code: i.e #29014/#29357. [Mingw-w64 12.0.0 has been released](https://sourceforge.net/p/mingw-w64/mailman/message/58776404/), which now defaults to the `UCRT` runtime, over `MSVCRT`. See https://github.com/mingw-w64/mingw-w64/blob/master/mingw-w64-doc/howto-build/ucrt-vs-msvcrt.txt for more details. This makes using it somewhat easier, because we can just use `12.0.0` verbatim, rather than having to configure an older mingw-w64 for the newer runtime. - [x] Upstream mingw-w64 12.0.0 into Guix: See https://git.savannah.gnu.org/cgit/guix.git/commit/?id=17188be0f723e00377b21b767f5447d7938a116e. - [x] Update Guix time-machine here: #30452. - [ ] Add CI to cover new runtime. - [ ] Drop MSVCRT workarounds. - [ ] Any other documentation / Windows release build configuration updates. - [ ] A symbol-check that the new runtime is indeed being used.

URL

https://github.com/bitcoin/bitcoin/issue/30210

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