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doc/README: add build test notes for Qt6 on Windows MSYS2

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mappu 2024-10-27 12:38:23 +13:00
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README.md
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@ -171,13 +171,20 @@ $env:CGO_CXXFLAGS = '-Wno-ignored-attributes -D_Bool=bool' # Clang 18 recommenda
### Windows (MSYS2)
*Tested with MSYS2 UCRT64 Qt 5.15 / GCC 14*
*Tested with MSYS2 UCRT64 Qt 5.15 / Qt 6.7 / GCC 14*
For dynamic linking:
```bash
pacman -S mingw-w64-ucrt-x86_64-{go,gcc,qt5-base,pkg-config}
GOROOT=/ucrt64/lib/go go build -ldflags "-s -w -H windowsgui"
# Install Go and C++ toolchains
pacman -S mingw-w64-ucrt-x86_64-{go,gcc,pkg-config}
export GOROOT=/ucrt64/lib/go # Needed only if this is the first time installing Go in MSYS2. Otherwise it would be automatically applied when opening a new Bash terminal.
# Install Qt
pacman -S mingw-w64-ucrt-x86_64-qt5-base # For Qt 5
pacman -S mingw-w64-ucrt-x86_64-qt6-base # For Qt 6
go build -ldflags "-s -w -H windowsgui"
```
- Note: the MSYS2 `qt5-base` package [links against `libicu`](https://github.com/msys2/MINGW-packages/blob/master/mingw-w64-qt5-base/PKGBUILD#L241), whereas the Fsu0413 Qt packages do not. When using MSYS2, your distribution size including `.dll` files will be larger.