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我用rust的cargo build命令编译polars-cli时，用时达到14分钟，如下所示。

    Finished `dev` profile [unoptimized + debuginfo] target(s) in 14m 19s，

通过核对时间戳，发觉其中最后一步生成可执行文件花了6分钟。
于是向DeepSeek请教，我在编译polars-cli时，debug 总用时14分钟，最后一步生成可执行文件花了6分钟，有办法缩短吗？
他向我推荐了mold（现代链接器），它的主页是https://github.com/rui314/mold，
关于rust它这么说

If you are using Rust
Create .cargo/config.toml in your project directory with the following:

[target.‘cfg(target_os = “linux”)’]
linker = “clang”
rustflags = [“-C”, “link-arg=-fuse-ld=/path/to/mold”]
where /path/to/mold is an absolute path to the mold executable. In the example above, we use clang as a linker driver since it always accepts the -fuse-ld option. If your GCC is recent enough to recognize the option, you may be able to remove the linker = “clang” line.

[target.‘cfg(target_os = “linux”)’]
rustflags = [“-C”, “link-arg=-fuse-ld=mold”]
If you want to use mold for all projects, add the above snippet to ~/.cargo/config.toml.

我的gcc版本12.2足够新，把上述两行添加到/usr/local/cargo/config.toml，但是cargo build报错：

  = note: cc: error: unrecognized command-line option '-fuse-ld=/par/mold240/bin/mold'    

再问deepseek, 得到了答案，原来gcc不支持绝对路径，而我用上述clang的语法加了绝对路径。所以要把mold二进制文件的位置加入PATH搜索路径。
用简单的命令试验成功

export PATH=/par/mold240/bin:$PATH
gcc fib.c -o fibm -fuse-ld=mold

于是修改 /usr/local/cargo/config.toml 为如下

cat  /usr/local/cargo/config.toml
[source.crates-io]
replace-with = 'mirror'[source.mirror]
registry = "sparse+https://mirrors.tuna.tsinghua.edu.cn/crates.io-index/"[registries.mirror]
index = "sparse+https://mirrors.tuna.tsinghua.edu.cn/crates.io-index/"[target.'cfg(target_os = "linux")']
rustflags = ["-C", "link-arg=-fuse-ld=mold"]

再次执行cargo build成功，全部重新编译用时

    Finished `dev` profile [unoptimized + debuginfo] target(s) in 4m 04s

构建速度提高了4倍，得到的二进制文件只比ld生成的略大。