Add prebuilt clang and qemu to release workflow

.github/setup-apt.sh

@@ -3,7 +3,7 @@
 # install OS prerequisites
 dpkg --add-architecture i386
 apt update
-apt install -y autoconf automake autotools-dev curl python3 libmpc-dev libmpfr-dev \
+apt install -y autoconf automake autotools-dev curl python3 python3-pip libmpc-dev libmpfr-dev \
             libgmp-dev gawk build-essential bison flex texinfo gperf libtool \
             patchutils bc zlib1g-dev libexpat-dev git ninja-build cmake libglib2.0-dev expect \
             device-tree-compiler

.github/workflows/nightly-release.yaml

@@ -68,8 +68,19 @@ jobs:
       - name: build toolchain
         run: |
           TARGET_TUPLE=($(echo ${{ matrix.target }} | tr "-" "\n"))
-          ./configure --prefix=/opt/riscv --with-arch=${TARGET_TUPLE[0]} --with-abi=${TARGET_TUPLE[1]}
-          sudo make -j $(nproc) ${{ matrix.mode }}
+          BUILD_TOOLCHAIN="./configure --prefix=/opt/riscv --with-arch=${TARGET_TUPLE[0]} --with-abi=${TARGET_TUPLE[1]}"
+          if [ "${{ matrix.mode }}" == "linux" ]; then # build toolchain with llvm
+            $BUILD_TOOLCHAIN --enable-llvm --enable-linux
+            sudo make -j $(nproc) all build-sim SIM=qemu
+          else
+            $BUILD_TOOLCHAIN
+            sudo make -j $(nproc) ${{ matrix.mode }}
+          fi
+
+      - name: build qemu
+        if: "${{ matrix.mode }}" == "linux"
+        run: |
+          make -j$(nproc) build-sim SIM=qemu
 
       - name: tarball build
         run: tar czvf riscv.tar.gz -C /opt/ riscv/

README.md

@@ -20,7 +20,7 @@ Several standard packages are needed to build the toolchain.
 
 On Ubuntu, executing the following command should suffice:
 
-    $ sudo apt-get install autoconf automake autotools-dev curl python3 libmpc-dev libmpfr-dev libgmp-dev gawk build-essential bison flex texinfo gperf libtool patchutils bc zlib1g-dev libexpat-dev ninja-build git cmake libglib2.0-dev
+    $ sudo apt-get install autoconf automake autotools-dev curl python3 python3-pip libmpc-dev libmpfr-dev libgmp-dev gawk build-essential bison flex texinfo gperf libtool patchutils bc zlib1g-dev libexpat-dev ninja-build git cmake libglib2.0-dev
 
 On Fedora/CentOS/RHEL OS, executing the following command should suffice: