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Rust learning notes

Rust

Version 1.42.0

$ curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh

version

$ rustc -V
rustc 1.42.0 (b8cedc004 2020-03-09)

$ rustc --version 
rustc 1.42.0 (b8cedc004 2020-03-09)

$ rustc -h
Usage: rustc [OPTIONS] INPUT

Options:
    -h, --help          Display this message
        --cfg SPEC      Configure the compilation environment
    -L [KIND=]PATH      Add a directory to the library search path. The
                        optional KIND can be one of dependency, crate, native,
                        framework, or all (the default).
    -l [KIND=]NAME      Link the generated crate(s) to the specified native
                        library NAME. The optional KIND can be one of
                        static, framework, or dylib (the default).
        --crate-type [bin|lib|rlib|dylib|cdylib|staticlib|proc-macro]
                        Comma separated list of types of crates
                        for the compiler to emit
        --crate-name NAME
                        Specify the name of the crate being built
        --edition 2015|2018
                        Specify which edition of the compiler to use when
                        compiling code.
        --emit [asm|llvm-bc|llvm-ir|obj|metadata|link|dep-info|mir]
                        Comma separated list of types of output for the
                        compiler to emit
        --print [crate-name|file-names|sysroot|cfg|target-list|target-cpus|target-features|relocation-models|code-models|tls-models|target-spec-json|native-static-libs]
                        Compiler information to print on stdout
    -g                  Equivalent to -C debuginfo=2
    -O                  Equivalent to -C opt-level=2
    -o FILENAME         Write output to <filename>
        --out-dir DIR   Write output to compiler-chosen filename in <dir>
        --explain OPT   Provide a detailed explanation of an error message
        --test          Build a test harness
        --target TARGET Target triple for which the code is compiled
    -W, --warn OPT      Set lint warnings
    -A, --allow OPT     Set lint allowed
    -D, --deny OPT      Set lint denied
    -F, --forbid OPT    Set lint forbidden
        --cap-lints LEVEL
                        Set the most restrictive lint level. More restrictive
                        lints are capped at this level
    -C, --codegen OPT[=VALUE]
                        Set a codegen option
    -V, --version       Print version info and exit
    -v, --verbose       Use verbose output

Additional help:
    -C help             Print codegen options
    -W help             Print 'lint' options and default settings
    --help -v           Print the full set of options rustc accepts

Current installation options:


   default host triple: x86_64-apple-darwin
     default toolchain: stable
               profile: default
  modify PATH variable: yes

1) Proceed with installation (default)
2) Customize installation
3) Cancel installation
>1

  stable installed - rustc 1.42.0 (b8cedc004 2020-03-09)


Rust is installed now. Great!

To get started you need Cargo's bin directory ($HOME/.cargo/bin) in your PATH
environment variable. Next time you log in this will be done
automatically.

To configure your current shell run source $HOME/.cargo/env
➜  ~ 

$ source $HOME/.cargo/env

https://github.com/rust-lang/rust

https://www.rust-lang.org/tools/install

https://github.com/rust-lang/rust/blob/master/src/rustc/rustc.rs

fn main() {
    // Pull in jemalloc when enabled.
    //
    // Note that we're pulling in a static copy of jemalloc which means that to
    // pull it in we need to actually reference its symbols for it to get
    // linked. The two crates we link to here, std and rustc_driver, are both
    // dynamic libraries. That means to pull in jemalloc we need to actually
    // reference allocation symbols one way or another (as this file is the only
    // object code in the rustc executable).
    #[cfg(feature = "jemalloc-sys")]
    {
        use std::os::raw::{c_int, c_void};

        #[used]
        static _F1: unsafe extern "C" fn(usize, usize) -> *mut c_void = jemalloc_sys::calloc;
        #[used]
        static _F2: unsafe extern "C" fn(*mut *mut c_void, usize, usize) -> c_int =
            jemalloc_sys::posix_memalign;
        #[used]
        static _F3: unsafe extern "C" fn(usize, usize) -> *mut c_void = jemalloc_sys::aligned_alloc;
        #[used]
        static _F4: unsafe extern "C" fn(usize) -> *mut c_void = jemalloc_sys::malloc;
        #[used]
        static _F5: unsafe extern "C" fn(*mut c_void, usize) -> *mut c_void = jemalloc_sys::realloc;
        #[used]
        static _F6: unsafe extern "C" fn(*mut c_void) = jemalloc_sys::free;
    }

    rustc_driver::set_sigpipe_handler();
    rustc_driver::main()
}

WebAssembly

《Rust 程序设计语言》

https://doc.rust-lang.org/book/

https://www.rust-lang.org/zh-CN/learn

// main.rs

fn main() {
    println!("Hello, world!");
}

$ rustc main.rs
$ ./main
Hello, world!

PATH environment variable

https://flutter.dev/docs/get-started/install/macos#update-your-path

$PATH

$ cat $HOME/.bash_profile 
$ cat $HOME/.bashrc

$ vim $HOME/.bash_profile 
$ vim $HOME/.bashrc

$ cat $HOME/.zshrc
$ vim $HOME/.zshrc

zsh

$ cat .zshrc
$ vim .zshrc

# flutter PATH & zsh
export PATH="$PATH:/Users/xgqfrms-mbp/Documents/Flutter/flutter/bin"

$ source $HOME/.zshrc

OK

# version
$ rustc --version
# rustc 1.42.0 (b8cedc004 2020-03-09

refs

https://doc.rust-lang.org/book/

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