wasm-pack build failed when some crate depend on the net2 crate!

[Itanq]

🐛 Bug description

When I clone the project template with this command:

argo generate --git https://github.com/rustwasm/wasm-pack-template

I can build the rust wasm project successffuly. But when I write same dependencies, such as url, reqwest, openssl, I build failed. This error looks like the reason for using the rust2015 version, such as following:

[INFO]: Checking for the Wasm target...
[INFO]: Compiling to Wasm...
   Compiling net2 v0.2.33
   Compiling failure_derive v0.1.5
   Compiling ryu v0.2.8
   Compiling serde v1.0.91
   Compiling foreign-types v0.3.2
   Compiling httparse v1.3.3
   Compiling regex v1.1.6
   Compiling regex-syntax v0.6.6
   Compiling crc32fast v1.2.0
   Compiling miniz_oxide v0.2.1
   Compiling encoding_rs v0.8.17
   Compiling rustc_version v0.2.3
   Compiling rand_pcg v0.1.2
   Compiling rand_chacha v0.1.1
   Compiling rand v0.6.5
error[E0432]: unresolved import `sys`
  --> /home/zmant/.cargo/registry/src/mirrors.ustc.edu.cn-61ef6e0cd06fb9b8/net2-0.2.33/src/tcp.rs:18:5
   |
18 | use sys::c;
   |     ^^^ maybe a missing `extern crate sys;`?

error[E0432]: unresolved import `sys`
  --> /home/zmant/.cargo/registry/src/mirrors.ustc.edu.cn-61ef6e0cd06fb9b8/net2-0.2.33/src/udp.rs:18:5
   |
18 | use sys::c;
   |     ^^^ maybe a missing `extern crate sys;`?

error[E0432]: unresolved import `sys`
  --> /home/zmant/.cargo/registry/src/mirrors.ustc.edu.cn-61ef6e0cd06fb9b8/net2-0.2.33/src/socket.rs:22:5
   |
22 | use sys;
   |     ^^^ no `sys` in the root

error[E0432]: unresolved import `sys`
  --> /home/zmant/.cargo/registry/src/mirrors.ustc.edu.cn-61ef6e0cd06fb9b8/net2-0.2.33/src/socket.rs:23:5
   |
23 | use sys::c;
   |     ^^^ maybe a missing `extern crate sys;`?

error[E0432]: unresolved import `sys`
  --> /home/zmant/.cargo/registry/src/mirrors.ustc.edu.cn-61ef6e0cd06fb9b8/net2-0.2.33/src/ext.rs:19:5
   |
19 | use sys;
   |     ^^^ no `sys` in the root

error[E0432]: unresolved import `sys`
  --> /home/zmant/.cargo/registry/src/mirrors.ustc.edu.cn-61ef6e0cd06fb9b8/net2-0.2.33/src/ext.rs:20:5
   |
20 | use sys::c;
   |     ^^^ maybe a missing `extern crate sys;`?

   Compiling rand_isaac v0.1.1
   Compiling rand_xorshift v0.1.1
   Compiling rand_hc v0.1.0
   Compiling libc v0.2.55
error[E0412]: cannot find type `c_int` in this scope
  --> /home/zmant/.cargo/registry/src/mirrors.ustc.edu.cn-61ef6e0cd06fb9b8/net2-0.2.33/src/socket.rs:30:24
   |
30 |     pub fn new(family: c_int, ty: c_int) -> io::Result<Socket> {
   |                        ^^^^^ not found in this scope
help: possible candidate is found in another module, you can import it into scope
   |
11 | use std::os::raw::c_int;

But the relevant build tools are the latest, such as following:

zmant@zmant-desktop:~/Project/Rust/wasm-pack-template$ rustc --version
rustc 1.36.0-nightly (73a3a90d2 2019-05-17)
zmant@zmant-desktop:~/Project/Rust/wasm-pack-template$ cargo --version
cargo 1.36.0-nightly (c4fcfb725 2019-05-15)
zmant@zmant-desktop:~/Project/Rust/wasm-pack-template$ wasm-pack --version
wasm-pack 0.8.1

I can successfully build net2 crates with cargo build command

zmant@zmant-desktop:~/.cargo/registry/src/mirrors.ustc.edu.cn-61ef6e0cd06fb9b8/net2-0.2.33$ cargo build
    Updating `git://mirrors.ustc.edu.cn/crates.io-index` index
   Compiling libc v0.2.55
   Compiling cfg-if v0.1.9
   Compiling net2 v0.2.33 (/home/zmant/.cargo/registry/src/mirrors.ustc.edu.cn-61ef6e0cd06fb9b8/net2-0.2.33)

I have been working on this problem for several days, and I haven't found a solution on other websites, such as stackoverflow. Can someone please help me to find out what the problem is.
Thanks you very much.

🤔 Expected Behavior

Build success

👟 Steps to reproduce

cargo generate --git https://github.com/rustwasm/wasm-pack-template

enter:

wasm-pack-template

and then go to the wasm-pack-template floder.
Edit the Cargo.toml such as:

[package]
name = "music"
version = "0.1.0"
authors = [""]
edition = "2018"

[lib]
crate-type = ["cdylib", "rlib"]

[features]
default = ["console_error_panic_hook"]

[dependencies]
url = "1.7"
reqwest = "0.9"
serde = { version = "1.0", features = ["derive"] }
serde_json = "1.0"
md5 = "0.6"
hex = "0.3"
openssl = "0.10"
regex = "1.1"
wasm-bindgen = "0.2"

console_error_panic_hook = { version = "0.1.1", optional = true }
wee_alloc = { version = "0.4.2", optional = true }

[dev-dependencies]
wasm-bindgen-test = "0.2"

[profile.release]
opt-level = "s"

use wasm-pack build to build, will build failed! 100% reproduce

Does anyone have the same problem?

🌍 Your environment

wasm-pack version: wasm-pack 0.8.1
rustc version: rustc 1.36.0-nightly (73a3a90d2 2019-05-17)

[csmoe]

wasm-pack's target_os is wasm32, which isn't included here.
https://github.com/rust-lang-nursery/net2-rs/blob/eda403f03033b58560d81b821f0df822f50cde4d/src/socket.rs#L15-L16
some of your dependies cannot work on wasm32.

[Itanq]

wasm-pack's target_os is wasm32, which isn't included here.
https://github.com/rust-lang-nursery/net2-rs/blob/eda403f03033b58560d81b821f0df822f50cde4d/src/socket.rs#L15-L16
some of your dependies cannot work on wasm32.

Yes, the net2 can't build on wasm32, thanks!