Android: `dx serve --android` fails with "Failed to encode RUSTFLAGS" when NDK/linker path contains a space

Problem dx serve --android fails before cargo runs:

Build failed: Failed to encode RUSTFLAGS

1: flag in rustflags must not contain its separator (' ')

Cause The Android rustflags for clang_rt.builtins are built as a single string:

format!(
            "-L{} -lstatic=clang_rt.builtins-{}-android",
            clang_builtins_target.join("lib").join("linux").display(),
            rt_builtins(&triple)
)

Fichier : packages/cli/src/build/android.rs Fonction : BuildRequest::android_env_vars()

That string always contains a space (two flags concatenated). If the NDK path itself also has a space (Android SDK, username with space, etc.), cargo-config2 encode_space_separated rejects it.

Expected Split into two flags and encode with CARGO_ENCODED_RUSTFLAGS (\x1f), which allows spaces in paths.

Reproduction NDK path with a space

dx compilation error

$ dx serve android
...
[dev] Build failed: Failed to encode RUSTFLAGS
       1: flag in rustflags must not contain its separator (' ')

Workaround Symlink the SDK/NDK to a path without spaces (/opt/android/sdk).