Merge pull request #3465 from practicalswift/use-tr-instead-of-python

Use tr to lower case string (instead of invoking python).

Author: practicalswift

utils/build-script-impl

@@ -276,11 +276,14 @@ function quoted_print() {
     python -c 'import pipes; import sys; print(" ".join(pipes.quote(arg) for arg in sys.argv[1:]))' "$@"
 }
 
-
 function toupper() {
     echo "$@" | tr '[:lower:]' '[:upper:]'
 }
 
+function tolower() {
+    echo "$@" | tr '[:upper:]' '[:lower:]'
+}
+
 function true_false() {
     case "$1" in
         false | FALSE | 0 | "")
@@ -406,7 +409,7 @@ function set_build_options_for_host() {
                         --foundation "$(build_directory ${host} foundation)"
                         --build-dir "$(build_directory ${host} playgroundlogger)"
                         --swift-build-dir "$(build_directory ${host} swift)"
-                        --$(python -c 'import sys; print sys.argv[1].lower()' ${PLAYGROUNDLOGGER_BUILD_TYPE})
+                        --$(tolower "${PLAYGROUNDLOGGER_BUILD_TYPE}")
                     )
                     ;;
                 linux-armv6)