> The big problem I see on Windows is unfortunately not the C++ standard library, but the C standard library. MinGW defaults to crtdll, the one from MSVC 6, which is not C99-compliant (MSVC 6 is from 1998 after all). A better alternative exists in the form of the Universal CRT, but that only comes by default with Windows 10, so we'd need to drop support for 8.1 -- have we done that? -- and recompile GCC and/or LLVM so they ask the linker to link to ucrt.
https://github.com/mstorsjo/llvm-mingw can be made to target ucrt; it even has releases: https://github.com/mstorsjo/llvm-mingw/releases/tag/20201020 As a data point, I've been using this toolchain for my own stuff for a couple years now and it works really well, though I only exercise qtbase/qtdeclarative/couple of smaller libs. All the best, Jean-Michaël On Fri, Nov 20, 2020 at 5:09 PM Thiago Macieira <thiago.macie...@intel.com> wrote: > On Friday, 20 November 2020 00:09:46 PST Oliver Wolff wrote: > > The question is not about having one more supported Windows > > configuration. We do not have the resources to add more and more > > configurations to support, so it's more a "replace mingw for Windows > > with something else" situation. As there seems to be a need for an open > > alternative, it looks like we cannot/should not go the clang-cl way, but > > clang-mingw if we replace mingw with a clang toolchain. > > That is not an option. We must have one MinGW configuration. > > We can choose which compiler and which version thereof, especially if the > official MinGW comes with an old GCC. If we think Clang + libcompiler-rt + > libc++ is a better solution for Windows, then we should explore it and > even > make it the default. But unless we do it RIGHT NOW, we will need an > overlap > period with a libstdc++ MinGW, due to ABI break. > > The big problem I see on Windows is unfortunately not the C++ standard > library, but the C standard library. MinGW defaults to crtdll, the one > from > MSVC 6, which is not C99-compliant (MSVC 6 is from 1998 after all). A > better > alternative exists in the form of the Universal CRT, but that only comes > by > default with Windows 10, so we'd need to drop support for 8.1 -- have we > done > that? -- and recompile GCC and/or LLVM so they ask the linker to link to > ucrt. > > -- > Thiago Macieira - thiago.macieira (AT) intel.com > Software Architect - Intel DPG Cloud Engineering > > > > _______________________________________________ > Development mailing list > Development@qt-project.org > https://lists.qt-project.org/listinfo/development >
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