linux-gnu target is now built with docker

ref #275, cross docker's glibc version is 2.15

.circleci/config.yml

@@ -37,13 +37,6 @@ jobs:
                       - /usr/local/cargo/registry
                       - ./target
                   key: cargo-cache-{{ arch }}-{{ checksum "rust-version" }}-{{ checksum "Cargo.lock" }}
-            - store_artifacts:
-                  path: ./build/release
-                  destination: releases
-            - persist_to_workspace:
-                  root: build
-                  paths:
-                      - release
 
     build-windows:
         executor: windows/default
@@ -160,6 +153,7 @@ jobs:
                       cd build
                       docker build -t shadowsocks-rust:x86_64-pc-windows-gnu -f Dockerfile.x86_64-pc-windows-gnu .
                       docker build -t shadowsocks-rust:x86_64-unknown-linux-musl -f Dockerfile.x86_64-unknown-linux-musl .
+                      docker build -t shadowsocks-rust:x86_64-unknown-linux-gnu -f Dockerfile.x86_64-unknown-linux-gnu .
                       docker build -t shadowsocks-rust:arm-unknown-linux-gnueabihf -f Dockerfile.arm-unknown-linux-gnueabihf .
                       docker build -t shadowsocks-rust:aarch64-unknown-linux-gnu -f Dockerfile.aarch64-unknown-linux-gnu .
             - run:
@@ -181,7 +175,7 @@ jobs:
                   command: |
                       cd build
                       ./build-release
-                  no_output_timeout: 1h
+                  no_output_timeout: 2h
             - save_cache:
                   paths:
                       - /usr/local/cargo/registry
@@ -241,7 +235,6 @@ workflows:
                           only: /^v\d+\.\d+\.\d+(-alpha\.\d+)?$/
             - publish-github-releases:
                   requires:
-                      - build-linux
                       - build-windows
                       - build-docker
                   filters:

build/Dockerfile.x86_64-unknown-linux-gnu

@@ -0,0 +1,3 @@
+FROM rustembedded/cross:x86_64-unknown-linux-gnu
+
+ENV RUSTFLAGS="-Ctarget-feature=+aes,+ssse3"

build/build-release

@@ -20,7 +20,15 @@ while getopts "t:" opt; do
 done
 
 if [[ "${#targets[@]}" == "0" ]]; then
-    targets=("x86_64-unknown-linux-musl" "x86_64-pc-windows-gnu" "arm-unknown-linux-gnueabihf" "aarch64-unknown-linux-gnu")
+    targets=(
+        "x86_64-unknown-linux-musl"
+        "x86_64-unknown-linux-gnu"
+
+        "x86_64-pc-windows-gnu"
+
+        "arm-unknown-linux-gnueabihf" # armhf, hard
+        "aarch64-unknown-linux-gnu"
+    )
 fi
 
 function build() {