Crossbuild Rust application for Windows on Gentoo Linux

build.sh

crossdev -t x86_64-w64-mingw32

# https://wiki.gentoo.org/wiki/Mingw#POSIX_threads_for_Windows
crossdev --genv 'EXTRA_ECONF="--enable-threads=posix"' --init-target --target cross-x86_64-w64-mingw32
echo "cross-x86_64-w64-mingw32/mingw64-runtime libraries idl tools" >> /etc/portage/package.use/cross-x86_64-w64-mingw32
emerge -1 cross-x86_64-w64-mingw32/mingw64-runtime
emerge -1 cross-x86_64-w64-mingw32/gcc

# https://bugs.gentoo.org/679878
ln -s /var/db/repos/gentoo/sys-devel/rust-std /var/db/repos/crossdev/cross-x86_64-w64-mingw32/
echo 'cross-x86_64-w64-mingw32/rust-std **' >> /etc/portage/package.accept_keywords/rust
echo 'export RUSTFLAGS="-C target-cpu=native -C opt-level=3"' >> /etc/portage/env/cross-x86_64-w64-mingw32/rust-std
echo 'export ERUST_STD_RTARGET="x86_64-pc-windows-gnu"' >> /etc/portage/env/cross-x86_64-w64-mingw32/rust-std
emerge -av cross-x86_64-w64-mingw32/rust-std

cd ~/Github
git clone https://github.com/unlimitedbacon/stl-thumb.git
cargo build --release --target x86_64-pc-windows-gnu