Use posix section 2.9.4.2

cc.sh

@@ -356,7 +356,7 @@ esac
 # In vcheck mode, nothing is added in terms of extra search paths or
 # libraries.
 if [ -z "$mode" ] || [ "$mode" = ld ]; then
-    for arg in "$@"; do
+    for arg; do
         case $arg in
             -v|-V|--version|-dumpversion)
                 mode=vcheck
@@ -369,7 +369,7 @@ fi
 # Finish setting up the mode.
 if [ -z "$mode" ]; then
     mode=ccld
-    for arg in "$@"; do
+    for arg; do
         case $arg in
             -E) mode=cpp; break ;;
             -S) mode=as; break ;;
@@ -434,7 +434,7 @@ export PATH="$new_dirs"
 if [ "$mode" = vcheck ]; then
     full_command_list="$command"
     extend full_command_list vcheck_flags
-    for arg in "$@"; do
+    for arg; do
         append full_command_list "$arg"
     done
     execute
@@ -446,7 +446,7 @@ fi
 add_rpaths=true
 if [ "$mode" = ld ] || [ "$mode" = ccld ]; then
     if [ "${SPACK_SHORT_SPEC#*darwin}" != "${SPACK_SHORT_SPEC}" ]; then
-        for arg in "$@"; do
+        for arg; do
             if [ "$arg" = "-r" ]; then
                 if [ "$mode" = ld ] || [ "$mode" = ccld ]; then
                     add_rpaths=false

test/run.sh

@@ -62,7 +62,7 @@ fail() {
 # no trailing newline.
 concat() {
     _first=1
-    for _piece in "$@"; do
+    for _piece; do
         [ -z "$_piece" ] && continue
         if [ "$_first" -eq 1 ]; then
             printf '%s' "$_piece"