cargo install cargo-binutils failed

[ruiqurm]

欢迎提出任何问题

环境

• rustc 1.62.0-nightly
• wsl2 Ubuntu 20.04

遇到问题

安装环境时，cargo install cargo-binutils 失败。
安装依赖clap v2.34.0时，提示：

error[E0658]: `if` is not allowed in a `const fn`
  --> /home/ruiqurm/.cargo/registry/src/mirrors.ustc.edu.cn-61ef6e0cd06fb9b8/clap-2.34.0/src/app/settings.rs:7:1
   |
7  | / bitflags! {
8  | |     struct Flags: u64 {
9  | |         const SC_NEGATE_REQS       = 1;
10 | |         const SC_REQUIRED          = 1 << 1;
...  |
51 | |     }
52 | | }
   | |_^
   |
   = note: see issue #49146 <https://github.com/rust-lang/rust/issues/49146> for more information
   = help: add `#![feature(const_if_match)]` to the crate attributes to enable
   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0658]: `if` is not allowed in a `const fn`
  --> /home/ruiqurm/.cargo/registry/src/mirrors.ustc.edu.cn-61ef6e0cd06fb9b8/clap-2.34.0/src/args/settings.rs:6:1
   |
6  | / bitflags! {
7  | |     struct Flags: u32 {
8  | |         const REQUIRED         = 1;
9  | |         const MULTIPLE         = 1 << 1;
...  |
28 | |     }
29 | | }
   | |_^
   |
   = note: see issue #49146 <https://github.com/rust-lang/rust/issues/49146> for more information
   = help: add `#![feature(const_if_match)]` to the crate attributes to enable
   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)

   Compiling addr2line v0.17.0
   Compiling regex v1.5.5
error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0658`.
error: could not compile `clap`.

尝试添加标志-Z minimal-versions : cargo install cargo-binutils -Z minimal-versions
在编译backtrace v0.3.5处失败：

Compiling backtrace v0.3.5
error[E0425]: cannot find value `RTLD_LAZY` in crate `libc`
  --> /home/ruiqurm/.cargo/registry/src/mirrors.ustc.edu.cn-61ef6e0cd06fb9b8/backtrace-0.3.5/src/dylib.rs:30:70
   |
30 |         let ptr = libc::dlopen(name.as_ptr() as *const c_char, libc::RTLD_LAZY);
   |                                                                      ^^^^^^^^^ not found in `libc`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0425`.
error: could not compile `backtrace`.

（可能的）解决方案

切换nightly到stable:

rustup override set stable

[infdahai]

It seems to be caused by the clap issue#2734 and some similar api-outdated cases.

So we only need to use the rust-toolchain version greater than 1.51.0 (such as nightly-2022-06-09) in the file rust-toolchain .