v2.0.4 Build Error in openWRT

[whlsxl]

   Compiling tun2 v2.0.4
     Running `rustc --crate-name tun2 --edition=2021 /lede/dl/cargo/registry/src/index.crates.io-6f17d22bba15001f/tun2-2.0.4/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --diagnostic-width=283 --crate-type staticlib --crate-type cdylib --crate-type lib --emit=dep-info,link -C opt-level=z -C codegen-units=1 -C overflow-checks=on --cfg 'feature="async"' --cfg 'feature="default"' --cfg 'feature="futures-core"' --cfg 'feature="tokio"' --cfg 'feature="tokio-util"' --cfg 'feature="wintun-dns"' -C metadata=335b9087992a3a79 -C extra-filename=-335b9087992a3a79 --out-dir /lede/build_dir/target-aarch64_cortex-a53_musl/shadowsocks-rust-1.20.2/target/aarch64-unknown-linux-musl/release/deps --target aarch64-unknown-linux-musl -C linker=aarch64-openwrt-linux-musl-gcc -C strip=symbols -L dependency=/lede/build_dir/target-aarch64_cortex-a53_musl/shadowsocks-rust-1.20.2/target/aarch64-unknown-linux-musl/release/deps -L dependency=/lede/build_dir/target-aarch64_cortex-a53_musl/shadowsocks-rust-1.20.2/target/release/deps --extern bytes=/lede/build_dir/target-aarch64_cortex-a53_musl/shadowsocks-rust-1.20.2/target/aarch64-unknown-linux-musl/release/deps/libbytes-3e1433cd5bbb36d0.rlib --extern cfg_if=/lede/build_dir/target-aarch64_cortex-a53_musl/shadowsocks-rust-1.20.2/target/aarch64-unknown-linux-musl/release/deps/libcfg_if-89fd22910ccdacf5.rlib --extern futures_core=/lede/build_dir/target-aarch64_cortex-a53_musl/shadowsocks-rust-1.20.2/target/aarch64-unknown-linux-musl/release/deps/libfutures_core-e1534271e7b20532.rlib --extern libc=/lede/build_dir/target-aarch64_cortex-a53_musl/shadowsocks-rust-1.20.2/target/aarch64-unknown-linux-musl/release/deps/liblibc-4f96b045d43c3d3d.rlib --extern log=/lede/build_dir/target-aarch64_cortex-a53_musl/shadowsocks-rust-1.20.2/target/aarch64-unknown-linux-musl/release/deps/liblog-21587c054ada44ff.rlib --extern nix=/lede/build_dir/target-aarch64_cortex-a53_musl/shadowsocks-rust-1.20.2/target/aarch64-unknown-linux-musl/release/deps/libnix-d9e54679135bec6d.rlib --extern thiserror=/lede/build_dir/target-aarch64_cortex-a53_musl/shadowsocks-rust-1.20.2/target/aarch64-unknown-linux-musl/release/deps/libthiserror-49aaf06702ee2934.rlib --extern tokio=/lede/build_dir/target-aarch64_cortex-a53_musl/shadowsocks-rust-1.20.2/target/aarch64-unknown-linux-musl/release/deps/libtokio-f181ef23a1f91e9a.rlib --extern tokio_util=/lede/build_dir/target-aarch64_cortex-a53_musl/shadowsocks-rust-1.20.2/target/aarch64-unknown-linux-musl/release/deps/libtokio_util-b40649d6cddc22d7.rlib --cap-lints allow -Ctarget-feature=-crt-static -lssp_nonshared`
error[E0716]: temporary value dropped while borrowed
  --> /lede/dl/cargo/registry/src/index.crates.io-6f17d22bba15001f/tun2-2.0.4/src/platform/posix/split.rs:90:18
   |
87 |         let local_buf = if in_buf_len > STACK_BUF_LEN && self.offset != 0 {
   |             --------- borrow later stored here
...
90 |             &mut [0u8; STACK_BUF_LEN]
   |                  ^^^^^^^^^^^^^^^^^^^^ creates a temporary value which is freed while still in use
91 |         };
   |         - temporary value is freed at the end of this statement
   |
   = note: consider using a `let` binding to create a longer lived value

error[E0716]: temporary value dropped while borrowed
  --> /lede/dl/cargo/registry/src/index.crates.io-6f17d22bba15001f/tun2-2.0.4/src/platform/posix/split.rs:88:18
   |
87 |         let local_buf = if in_buf_len > STACK_BUF_LEN && self.offset != 0 {
   |             --------- borrow later stored here
88 |             &mut vec![0u8; in_buf_len][..]
   |                  ^^^^^^^^^^^^^^^^^^^^^ creates a temporary value which is freed while still in use
89 |         } else {
   |         - temporary value is freed at the end of this statement
   |
   = note: consider using a `let` binding to create a longer lived value
   = note: this error originates in the macro `vec` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0716]: temporary value dropped while borrowed
   --> /lede/dl/cargo/registry/src/index.crates.io-6f17d22bba15001f/tun2-2.0.4/src/platform/posix/split.rs:155:18
    |
152 |         let local_buf = if in_buf_len > STACK_BUF_LEN && self.offset != 0 {
    |             --------- borrow later stored here
...
155 |             &mut [0u8; STACK_BUF_LEN]
    |                  ^^^^^^^^^^^^^^^^^^^^ creates a temporary value which is freed while still in use
156 |         };
    |         - temporary value is freed at the end of this statement
    |
    = note: consider using a `let` binding to create a longer lived value

error[E0716]: temporary value dropped while borrowed
   --> /lede/dl/cargo/registry/src/index.crates.io-6f17d22bba15001f/tun2-2.0.4/src/platform/posix/split.rs:153:18
    |
152 |         let local_buf = if in_buf_len > STACK_BUF_LEN && self.offset != 0 {
    |             --------- borrow later stored here
153 |             &mut vec![0u8; in_buf_len][..]
    |                  ^^^^^^^^^^^^^^^^^^^^^ creates a temporary value which is freed while still in use
154 |         } else {
    |         - temporary value is freed at the end of this statement
    |
    = note: consider using a `let` binding to create a longer lived value
    = note: this error originates in the macro `vec` (in Nightly builds, run with -Z macro-backtrace for more info)

For more information about this error, try `rustc --explain E0716`.
error: could not compile `tun2` (lib) due to 4 previous errors

Caused by:
  process didn't exit successfully: `rustc --crate-name tun2 --edition=2021 /lede/dl/cargo/registry/src/index.crates.io-6f17d22bba15001f/tun2-2.0.4/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --diagnostic-width=283 --crate-type staticlib --crate-type cdylib --crate-type lib --emit=dep-info,link -C opt-level=z -C codegen-units=1 -C overflow-checks=on --cfg 'feature="async"' --cfg 'feature="default"' --cfg 'feature="futures-core"' --cfg 'feature="tokio"' --cfg 'feature="tokio-util"' --cfg 'feature="wintun-dns"' -C metadata=335b9087992a3a79 -C extra-filename=-335b9087992a3a79 --out-dir /lede/build_dir/target-aarch64_cortex-a53_musl/shadowsocks-rust-1.20.2/target/aarch64-unknown-linux-musl/release/deps --target aarch64-unknown-linux-musl -C linker=aarch64-openwrt-linux-musl-gcc -C strip=symbols -L dependency=/lede/build_dir/target-aarch64_cortex-a53_musl/shadowsocks-rust-1.20.2/target/aarch64-unknown-linux-musl/release/deps -L dependency=/lede/build_dir/target-aarch64_cortex-a53_musl/shadowsocks-rust-1.20.2/target/release/deps --extern bytes=/lede/build_dir/target-aarch64_cortex-a53_musl/shadowsocks-rust-1.20.2/target/aarch64-unknown-linux-musl/release/deps/libbytes-3e1433cd5bbb36d0.rlib --extern cfg_if=/lede/build_dir/target-aarch64_cortex-a53_musl/shadowsocks-rust-1.20.2/target/aarch64-unknown-linux-musl/release/deps/libcfg_if-89fd22910ccdacf5.rlib --extern futures_core=/lede/build_dir/target-aarch64_cortex-a53_musl/shadowsocks-rust-1.20.2/target/aarch64-unknown-linux-musl/release/deps/libfutures_core-e1534271e7b20532.rlib --extern libc=/lede/build_dir/target-aarch64_cortex-a53_musl/shadowsocks-rust-1.20.2/target/aarch64-unknown-linux-musl/release/deps/liblibc-4f96b045d43c3d3d.rlib --extern log=/lede/build_dir/target-aarch64_cortex-a53_musl/shadowsocks-rust-1.20.2/target/aarch64-unknown-linux-musl/release/deps/liblog-21587c054ada44ff.rlib --extern nix=/lede/build_dir/target-aarch64_cortex-a53_musl/shadowsocks-rust-1.20.2/target/aarch64-unknown-linux-musl/release/deps/libnix-d9e54679135bec6d.rlib --extern thiserror=/lede/build_dir/target-aarch64_cortex-a53_musl/shadowsocks-rust-1.20.2/target/aarch64-unknown-linux-musl/release/deps/libthiserror-49aaf06702ee2934.rlib --extern tokio=/lede/build_dir/target-aarch64_cortex-a53_musl/shadowsocks-rust-1.20.2/target/aarch64-unknown-linux-musl/release/deps/libtokio-f181ef23a1f91e9a.rlib --extern tokio_util=/lede/build_dir/target-aarch64_cortex-a53_musl/shadowsocks-rust-1.20.2/target/aarch64-unknown-linux-musl/release/deps/libtokio_util-b40649d6cddc22d7.rlib --cap-lints allow -Ctarget-feature=-crt-static -lssp_nonshared` (exit status: 1)
error: failed to compile `shadowsocks-rust v1.20.2 (/lede/build_dir/target-aarch64_cortex-a53_musl/shadowsocks-rust-1.20.2)`, intermediate artifacts can be found at `/lede/build_dir/target-aarch64_cortex-a53_musl/shadowsocks-rust-1.20.2/target`.
To reuse those artifacts with a future compilation, set the environment variable `CARGO_TARGET_DIR` to that path.

Not familiar with rust, when compiling shadowsocks-rust v1.20.2, get this error.

[ssrlive]

What's your rustc --version? my result is rustc 1.79.0 (129f3b996 2024-06-10).

[ssrlive]

I repeat, What's your rustc --version? my result is rustc 1.79.0 (129f3b996 2024-06-10) and rustc 1.82.0-nightly (7120fdac7 2024-07-25).

[ssrlive]

Emm, It's a new feature since rust 1.79. https://blog.rust-lang.org/2024/06/13/Rust-1.79.0.html#extending-automatic-temporary-lifetime-extension

[whlsxl]

The toolchain Rust version is 1.78.0, I think that's the reason.

Thanks for your quick response & fix so fast!