On Thu, 20 Jul 2023, Martin Storsjö wrote:
On Wed, 19 Jul 2023, Thiago Macieira wrote:
It's also orthogonal, because GCC supports UCRT too, with this patch:
https://github.com/msys2/MINGW-packages/raw/
8d9ebb74412c1faabc2a3935bfc705bec19edb9a/mingw-w64-gcc/0006-Windows-New-
feature-to-allow-overriding.patch
Indeed UCRT support isn't Clang specific at all - but GCC doesn't really need
that patch either.
And conversely, that patch (and a later recently upstreamed version of the
same) gives a false sense of being able to switch between msvcrt and UCRT at
will; that feature really needs to come with a big disclaimer.
I realized the wrap-up of that mail might have sounded like taking a
stance for/against either compiler, which it wasn't.
So TL;DR, pretend that flag doesn't exist in GCC, and just use a toolchain
that was bootstrapped for the desired CRT. (The flag is more useful for
switching between older variants of the MSVC CRTs that have less hairy ABI
differences.)
I.e. use any toolchain, based on either GCC or Clang, bootstrapped with
the desired CRT choice from the bottom up. But don't try to switch a
msvcrt-targeting GCC toolchain to target UCRT with that flag (unless
specifically doing low-level experimentation).
// Martin
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