makelinux.zsh: Add compiler selection options

I add an easy way to select between gcc and clang. Additionally, I add
an option to cross-compile for arm64 architectures.

Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

completions/_makelinux.zsh

@@ -1,7 +1,11 @@
 #compdef makelinux.zsh
 
 function _makelinux.zsh() {
-	_arguments '*: :_make'
+	_arguments \
+		--clang'[compile using clang]' \
+		--gcc'[compile using gcc]' \
+		--arm64'[cross-compile for arm64]' \
+		'*: :_make'
 }
 
 _makelinux.zsh "$@"

makelinux.zsh

@@ -1,11 +1,30 @@
 #!/bin/zsh
-
 set -eo pipefail
 let jobs=$(nproc)-2
 
+ARCH=$(uname -m)
+CROSS_COMPILE=
+CC=
+OPTS=(--clang)
+
+zparseopts -D -K -clang+=OPTS -gcc+=OPTS -arm64+=OPTS
+
+case ${OPTS[-1]} in
+--clang) CC=clang ;;
+--gcc) CC=gcc ;;
+--arm64) ARCH=arm64
+	 CC=gcc
+	 CROSS_COMPILE=aarch64-linux-gnu-
+	 ;;
+esac
+
 if [ -f .git/config  ] && [ -f .git/HEAD ]; then
 	REV=$(git rev-parse --short HEAD)$(git diff --quiet || echo "-dirty")
 	scripts/config --set-str CONFIG_LOCALVERSION "-g$REV"
 fi
 
-make -j$jobs $* | python /home/anna/bin/colors/make.py
+make -j$jobs CC=$CC ARCH=$ARCH CROSS_COMPILE=$CROSS_COMPILE $* | python -u /home/anna/bin/colors/make.py
+
+if [[ "$CC" == "clang" ]]; then
+	scripts/clang-tools/gen_compile_commands.py &
+fi