ckb-std 0.8.0

This library contains serveral modules help you write CKB contract with Rust
Documentation 
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use std::env;

fn main() {
    let target_arch = env::var("CARGO_CFG_TARGET_ARCH").unwrap();

    let mut build = cc::Build::new();
    build
        .file("dl-c-impl/lib.c")
        .static_flag(true)
        .flag("-O3")
        .flag("-fno-builtin-printf")
        .flag("-fno-builtin-memcmp")
        .flag("-nostdinc")
        .flag("-nostdlib")
        .flag("-fvisibility=hidden")
        .flag("-fdata-sections")
        .flag("-ffunction-sections")
        .include("dl-c-impl/ckb-c-stdlib")
        .include("dl-c-impl/ckb-c-stdlib/libc")
        .flag("-Wall")
        .flag("-Werror")
        .flag("-Wno-unused-parameter")
        .flag("-Wno-nonnull")
        .define("__SHARED_LIBRARY__", None);
    // ckb-std only supports riscv64 target arch
    // but we can still use cargo check under other archs
    if target_arch == "riscv64" {
        cc::Build::new()
            .file("src/asm/syscall.S")
            .compile("ckb-syscall");
        build
            .flag("-Wno-nonnull-compare")
            .flag("-nostartfiles")
            .compile("dl-c-impl");
    } else {
        build.define("CKB_STDLIB_NO_SYSCALL_IMPL", None);
        build.compile("dl-c-impl");
    }
}