ci: add support for loongarch64-unknown-linux-{gnu,musl}

.github/workflows/ci.yml

@@ -176,6 +176,8 @@ jobs:
           - arm-unknown-linux-gnueabi
           - armv7-linux-androideabi
           - armv7-unknown-linux-musleabihf
+          - loongarch64-unknown-linux-gnu
+          - loongarch64-unknown-linux-musl
           - i686-pc-windows-msvc
           - i686-unknown-linux-gnu
           - i686-unknown-linux-musl
@@ -257,6 +259,12 @@ jobs:
           - target: armv7-unknown-linux-musleabihf
             host_os: ubuntu-22.04
 
+          - target: loongarch64-unknown-linux-gnu
+            host_os: ubuntu-24.04
+
+          - target: loongarch64-unknown-linux-musl
+            host_os: ubuntu-24.04
+
           - target: i686-pc-windows-msvc
             host_os: windows-latest
 
@@ -322,6 +330,12 @@ jobs:
           - target: x86_64-unknown-linux-gnu
             host_os: ubuntu-22.04
 
+        exclude:
+          - target: loongarch64-unknown-linux-gnu
+            rust_channel: 1.63.0
+          - target: loongarch64-unknown-linux-musl
+            rust_channel: 1.63.0
+
     steps:
       - if: ${{ contains(matrix.host_os, 'ubuntu') }}
         run: sudo apt-get update -y
@@ -578,6 +592,8 @@ jobs:
           - aarch64-unknown-linux-gnu      # Has assembly
           - arm-unknown-linux-gnueabi      # Has assembly
           - armv7-unknown-linux-gnueabihf  # Has assembly
+          - loongarch64-unknown-linux-gnu  # Has assembly
+          - loongarch64-unknown-linux-musl # Has assembly
           # - i686-unknown-linux-gnu       # Has assembly; handled specially below.
           - powerpc-unknown-linux-gnu      # No assembly 32-bit big-endian with flags
           - powerpc64-unknown-linux-gnu    # No assembly 64-bit big-endian with flags
@@ -623,6 +639,12 @@ jobs:
             rust_channel: nightly
             host_os: ubuntu-22.04
 
+          - target: loongarch64-unknown-linux-gnu
+            host_os: ubuntu-24.04
+
+          - target: loongarch64-unknown-linux-musl
+            host_os: ubuntu-24.04
+
           # TODO: Use the -musl target after
           # https://github.com/rust-lang/rust/issues/79556 and
           # https://github.com/rust-lang/rust/issues/79555 are fixed.

mk/cargo.sh

@@ -21,6 +21,7 @@ rustflags_self_contained="-Clink-self-contained=yes -Clinker=rust-lld"
 qemu_aarch64="qemu-aarch64 -L /usr/aarch64-linux-gnu"
 qemu_arm_gnueabi="qemu-arm -L /usr/arm-linux-gnueabi"
 qemu_arm_gnueabihf="qemu-arm -L /usr/arm-linux-gnueabihf"
+qemu_loongarch64="qemu-loongarch64 -L /usr/loongarch64-linux-gnu"
 qemu_mips="qemu-mips -L /usr/mips-linux-gnu"
 qemu_mips64="qemu-mips64 -L /usr/mips64-linux-gnuabi64"
 qemu_mips64el="qemu-mips64el -L /usr/mips64el-linux-gnuabi64"
@@ -201,7 +202,16 @@ case $target in
     ;;
   loongarch64-unknown-linux-gnu)
     use_clang=1
-    export CARGO_TARGET_LOONGARCH64_UNKNOWN_LINUX_GNU_LINKER=clang-$llvm_version
+    export CC_loongarch64_unknown_linux_gnu=loongarch64-linux-gnu-gcc-14
+    export AR_loongarch64_unknown_linux_gnu=loongarch64-linux-gnu-gcc-ar
+    export CFLAGS_loongarch64_unknown_linux_gnu="--sysroot=/usr/loongarch64-linux-gnu"
+    export CARGO_TARGET_LOONGARCH64_UNKNOWN_LINUX_GNU_LINKER=loongarch64-linux-gnu-gcc-14
+    export CARGO_TARGET_LOONGARCH64_UNKNOWN_LINUX_GNU_RUNNER="$qemu_loongarch64"
+    ;;
+  loongarch64-unknown-linux-musl)
+    use_clang=1
+    export CARGO_TARGET_LOONGARCH64_UNKNOWN_LINUX_MUSL_RUSTFLAGS="-Ctarget-feature=+crt-static $rustflags_self_contained"
+    export CARGO_TARGET_LOONGARCH64_UNKNOWN_LINUX_MUSL_RUNNER="$qemu_loongarch64"
     ;;
   wasm32-unknown-unknown)
     # The first two are only needed for when the "wasm_c" feature is enabled.

mk/install-build-tools.sh

@@ -113,6 +113,15 @@ i686-unknown-linux-musl|x86_64-unknown-linux-musl)
   ;;
 loongarch64-unknown-linux-gnu)
   use_clang=1
+  install_packages \
+    gcc-14-loongarch64-linux-gnu \
+    libc6-dev-loong64-cross \
+    qemu-user
+  ;;
+loongarch64-unknown-linux-musl)
+  use_clang=1
+  install_packages \
+    qemu-user
   ;;
 mips-unknown-linux-gnu)
   install_packages \