Merge #7658

7658: Build dist-x86_64-unknown-linux-musl releases r=lnicola a=andylizi

Closes #4956.

* Artifact sample: [rust-analyzer-x86_64-unknown-linux-musl.gz](https://github.com/rust-analyzer/rust-analyzer/files/5975504/rust-analyzer-x86_64-unknown-linux-musl.gz)
* Build time: ~14m
```
$ ls -lh
-rwxr-xr-x    1 root     root       29.7M Feb 13 18:24 rust-analyzer-x86_64-unknown-linux-musl

$ ldd rust-analyzer-x86_64-unknown-linux-musl
        /lib/ld-musl-x86_64.so.1 (0x7f2751f13000)
        libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x7f2750a78000)
        libc.musl-x86_64.so.1 => /lib/ld-musl-x86_64.so.1 (0x7f2751f13000)

$ ./rust-analyzer-x86_64-unknown-linux-musl --version
rust-analyzer 63fcf65
```

I can do `aarch64-unknown-linux-musl` if it's also needed.

Co-authored-by: andylizi <andylizi666@gmail.com>

.github/workflows/release.yaml

@@ -121,6 +121,34 @@ jobs:
         name: dist-x86_64-unknown-linux-gnu
         path: ./dist
 
+  dist-x86_64-unknown-linux-musl:
+    name: dist (x86_64-unknown-linux-musl)
+    runs-on: ubuntu-20.04
+    env:
+      RA_TARGET: x86_64-unknown-linux-musl
+      # For some reason `-crt-static` is not working for clang without lld
+      RUSTFLAGS: "-C link-arg=-fuse-ld=lld -C target-feature=-crt-static"
+    container:
+      image: rust:alpine
+      volumes:
+      - /usr/local/cargo/registry
+
+    steps:
+    - name: Install dependencies
+      run: apk add --no-cache git clang lld musl-dev
+
+    - name: Checkout repository
+      uses: actions/checkout@v2
+
+    - name: Dist
+      run: cargo xtask dist
+
+    - name: Upload artifacts
+      uses: actions/upload-artifact@v1
+      with:
+        name: dist-x86_64-unknown-linux-musl
+        path: ./dist
+
   dist-aarch64-unknown-linux-gnu:
     name: dist (aarch64-unknown-linux-gnu)
     runs-on: ubuntu-16.04
@@ -216,7 +244,7 @@ jobs:
   publish:
     name: publish
     runs-on: ubuntu-16.04
-    needs: ['dist-x86_64-pc-windows-msvc', 'dist-aarch64-pc-windows-msvc', 'dist-x86_64-unknown-linux-gnu', 'dist-aarch64-unknown-linux-gnu', 'dist-x86_64-apple-darwin', 'dist-aarch64-apple-darwin']
+    needs: ['dist-x86_64-pc-windows-msvc', 'dist-aarch64-pc-windows-msvc', 'dist-x86_64-unknown-linux-gnu', 'dist-x86_64-unknown-linux-musl', 'dist-aarch64-unknown-linux-gnu', 'dist-x86_64-apple-darwin', 'dist-aarch64-apple-darwin']
     steps:
     - name: Install Nodejs
       uses: actions/setup-node@v1
@@ -247,6 +275,10 @@ jobs:
       with:
         name: dist-x86_64-unknown-linux-gnu
         path: dist
+    - uses: actions/download-artifact@v1
+      with:
+        name: dist-x86_64-unknown-linux-musl
+        path: dist
     - uses: actions/download-artifact@v1
       with:
         name: dist-aarch64-unknown-linux-gnu

xtask/src/dist.rs

@@ -59,7 +59,7 @@ fn dist_client(version: &str, release_tag: &str) -> Result<()> {
 
 fn dist_server() -> Result<()> {
     let target = get_target();
-    if target.contains("-linux-gnu") {
+    if target.contains("-linux-gnu") || target.contains("-linux-musl") {
         env::set_var("CC", "clang");
     }