Add freebsd/amd64 platform (FreeBSD 13.2-RELEASE-p2 GENERIC amd64)

build.sh

@@ -9,6 +9,7 @@ fi
 
 unameOut="$(uname -s)-$(uname -m)"
 case "${unameOut}" in
+    FreeBSD-amd64*) HOST_TRIPLE=x86_64-unknown-freebsd;;
     Linux-x86_64*)  HOST_TRIPLE=x86_64-unknown-linux-gnu;;
     Linux-aarch64*) HOST_TRIPLE=aarch64-unknown-linux-gnu;;
     Darwin-x86_64*) HOST_TRIPLE=x86_64-apple-darwin;;
@@ -17,6 +18,24 @@ case "${unameOut}" in
     *)              HOST_TRIPLE=x86_64-unknown-linux-gnu
 esac
 
+if [[ "${HOST_TRIPLE}" == *-freebsd ]]; then
+    if [[ "$(swig -swiglib)" == */4.1.* ]]; then
+	# Default swig 4.1.2 on FreeBSD 13.x doesn't work due to
+	# broken %nothreadallow / %clearnothreadallow directives
+	# Use swig40 instead
+	fgrep -wq 'SWIG_EXECUTABLE' config.toml ||
+	ed config.toml <<-'EOF'
+	/^\[llvm\]/a
+
+	# Custom CMake defines to set when building LLVM.
+	build-config = { SWIG_EXECUTABLE = '/usr/local/bin/swig40' }
+	.
+	+1,$g/^ *build-config *=/d
+	w
+	EOF
+    fi
+fi
+
 if [ "$1" == "--llvm" ]; then
     rm -f build/${HOST_TRIPLE}/llvm/llvm-finished-building;
 fi