Using Rust in Wine as a sort of cross-compiler

rust_wine.md

Cross-compiling Rust from Linux to Windows using Wine

0. Ensure Rust works on Host

Let's create a dummy project for a test.

$ cargo new test
$ cd test/
$ mkdir examples
$ echo 'fn main() { println!("QQQ") }' > examples/q.rs
$ cargo run --example q
   Compiling test v0.1.0 (file:///mnt/raidy/wine/rsmkvparse/test)
     Running `target/debug/examples/q`
QQQ

Let's also ensure Wine itself works:

$ wine cmd /c 'echo qqq'
qqq

1. Installing Rust in Wine

• Download the msi package for Rust

    $ wget https://static.rust-lang.org/dist/rust-nightly-i686-pc-windows-gnu.msi
  

• Install it

    $ wine msiexec /i rust-nightly-i686-pc-windows-gnu.msi
  

  next, next, next

• Compare host and Wine's rustc verions

    $ wine .wine/drive_c/Program\ Files/Rust\ nightly\ 1.4/bin/rustc.exe -vV
    rustc 1.4.0-nightly (fd302a95e 2015-08-27)
    binary: rustc
    commit-hash: fd302a95e1197e5f8401ecaa15f2cb0f81c830c3
    commit-date: 2015-08-27
    host: i686-pc-windows-gnu
    release: 1.4.0-nightly
    
    $ rustc -vV
    rustc 1.4.0-nightly (fd302a95e 2015-08-27)
    binary: rustc
    commit-hash: fd302a95e1197e5f8401ecaa15f2cb0f81c830c3
    commit-date: 2015-08-27
    host: i686-unknown-linux-gnu
    release: 1.4.0-nightly
  

  They do match.

2. Copy rust library from Wine to your normal prefix

$ cp -R ~/.wine/drive_c/Program\ Files/Rust\ nightly\ 1.4/bin/rustlib/i686-pc-windows-gnu ~/prefix/lib/rustlib/

In your case, both paths may differ. Use find / -name rustlib if not sure.

3. Create gcc wrapper script

We need MinGW's gcc to link our executables, not hosts's.

$ cat > $HOME/gccwrapper << EOF
#!/bin/sh
exec wine '$HOME/.wine/drive_c/Program Files/Rust nightly 1.4/bin/rustlib/i686-pc-windows-gnu/bin/gcc.exe' "\$@"
EOF

$ chmod +x ~/gccwrapper

We can't test this wrapper properly although

$ echo 'int main(){printf("HW\n");}' > hello.c
$ ~/gccwrapper hello.c -o hello.exe
gcc.exe: error: CreateProcess: No such file or directory

Ensure you get something like this anyway.

Maybe you'll also need something like export WINEPATH='C:\Program Files\Rust nightly 1.4\bin\rustlib\i686-pc-windows-gnu\bin' in the wrapper script.

On the other hand, we should already be able to invoke rustc for it:

$ rustc -C linker=~/gccwrapper  --target i686-pc-windows-gnu examples/q.rs 
$ wine q.exe 
QQQ

4. Let's specify cargo our wrapper

cat >> ~/.cargo/config << EOF
[target.i686-pc-windows-gnu]
linker = "$HOME/gccwrapper"
EOF

5. Finally, let's build and test our example for Wine

$ cargo build --target i686-pc-windows-gnu --example q
   Compiling test v0.1.0 (file:///mnt/raidy/wine/rsmkvparse/test)
$ wine target/i686-pc-windows-gnu/debug/examples/q.exe 
QQQ

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License: CC-Wiki, Created by Vitaly "_Vi" Shukela in 2015 with the help from WindowsBunny from irc.mozilla.org/#rust