try x86_64-unknown-linux-musl with special RUSTFLAGS

Author: asg017

.github/workflows/test.yaml

@@ -46,7 +46,7 @@ jobs:
           - armv7-unknown-linux-gnueabihf
           #- armv7-unknown-linux-musleabihf # "cannot produce cdylib ... as the target `armv7-unknown-linux-musleabihf` does not support these crate types"
           - x86_64-unknown-linux-gnu
-          #- x86_64-unknown-linux-musl # cannot produce cdylib ... as the target `x86_64-unknown-linux-musl` does not support these crate types
+          - x86_64-unknown-linux-musl # cannot produce cdylib ... as the target `x86_64-unknown-linux-musl` does not support these crate types
           - aarch64-unknown-linux-gnu
           #- aarch64-unknown-linux-musl # cannot produce cdylib for ... as the target `aarch64-unknown-linux-musl` does not support these crate types
     steps:
@@ -66,6 +66,8 @@ jobs:
       - run: sudo apt-get install -qq crossbuild-essential-arm64 crossbuild-essential-armhf gcc-arm-linux-gnueabi
       - run: rustup target add ${{ matrix.target }}
       - run: cargo build --examples --verbose --target ${{ matrix.target }}
+        env:
+          RUSTFLAGS: "-C target-feature=-crt-static"
       - name: Upload artifacts
         uses: actions/upload-artifact@v2
         with: