Add script to build circt-from-source - from submodule

.gitmodules

@@ -148,3 +148,6 @@
 [submodule "generators/rocket-chip-inclusive-cache"]
 	path = generators/rocket-chip-inclusive-cache
 	url = https://github.com/chipsalliance/rocket-chip-inclusive-cache.git
+[submodule "tools/circt"]
+	path = tools/circt
+	url = https://github.com/llvm/circt.git

scripts/build-circt-from-source.sh

@@ -0,0 +1,97 @@
+#!/usr/bin/env bash
+
+# exit script if any command fails
+set -e
+set -o pipefail
+
+RDIR=$(git rev-parse --show-toplevel)
+
+# get helpful utilities
+source $RDIR/scripts/utils.sh
+
+common_setup
+
+# Allow user to override MAKE
+[ -n "${MAKE:+x}" ] || MAKE=$(command -v gnumake || command -v gmake || command -v make)
+readonly MAKE
+
+usage() {
+    echo "usage: ${0}"
+    echo ""
+    echo "Options"
+    echo "   --prefix -p PREFIX    : Install destination."
+    echo "   --help -h             : Display this message"
+    exit "$1"
+}
+
+PREFIX=""
+
+# getopts does not support long options, and is inflexible
+while [ "$1" != "" ];
+do
+    case $1 in
+        -h | -H | --help | help )
+            usage 3 ;;
+        -p | --prefix )
+            shift
+            PREFIX=$(realpath $1) ;;
+        * )
+            error "invalid option $1"
+            usage 1 ;;
+    esac
+    shift
+done
+
+if [ -z "$PREFIX" ] ; then
+    error "ERROR: Prefix not given."
+    exit 1
+fi
+
+
+
+echo "Cloning CIRCT submodules"
+(
+    cd $RDIR/tools
+    git submodule update --init circt
+    cd circt
+    git submodule init
+    git submodule update
+)
+
+echo "Building CIRCT's LLVM/MLIR"
+(
+    cd $RDIR/tools/circt
+    rm -rf llvm/build
+    mkdir llvm/build
+    cd llvm/build
+    cmake -G Ninja ../llvm \
+	  -DLLVM_ENABLE_PROJECTS="mlir" \
+	  -DLLVM_TARGETS_TO_BUILD="host" \
+	  -DLLVM_ENABLE_ASSERTIONS=ON \
+	  -DCMAKE_BUILD_TYPE=DEBUG \
+	  -DCMAKE_EXPORT_COMPILE_COMMANDS=ON
+    ninja
+)
+
+echo "Building CIRCT"
+(
+    cd $RDIR/tools/circt
+    rm -rf build
+    mkdir build
+    cd build
+    cmake -G Ninja .. \
+	  -DMLIR_DIR=../llvm/build/lib/cmake/mlir \
+	  -DLLVM_DIR=../llvm/build/lib/cmake/llvm \
+	  -DLLVM_ENABLE_ASSERTIONS=ON \
+	  -DCMAKE_BUILD_TYPE=DEBUG \
+	  -DCMAKE_EXPORT_COMPILE_COMMANDS=ON \
+	  -DCMAKE_INSTALL_PREFIX=$PREFIX
+    ninja
+)
+
+echo "Installing CIRCT to $PREFIX"
+(
+    cd $RDIR/tools/circt/build
+    ninja install
+)
+