[update] : Enhanced confirmation of variables.

diff --git a/build.sh b/build.sh
index b54a1e7..06fc3c9 100755 (executable)
--- a/build.sh
+++ b/build.sh
@@ -1440,13 +1440,16 @@ fi
 
 # Check the value of a variable that can only be set to true or false.
 check_bool() {
+    local _value
+    _value="$(eval echo '$'${1})"
     _msg_debug -n "Checking ${1}..."
-    case $(eval echo '$'${1}) in
-        true | false) : ;;
-                *) echo; _msg_error "The variable name ${1} is not of bool type." "1";;
-    esac
     if [[ "${debug}" = true ]]; then
-        echo -e " ok"
+        echo -e " ${_value}"
+    fi
+    if [[ ! -v "${1}" ]]; then
+        echo; _msg_error "The variable name ${1} is empty." "1"
+    elif [[ ! "${_value}" = "true" ]] && [[ ! "${_value}" = "false" ]]; then
+        echo; _msg_error "The variable name ${1} is not of bool type." "1"
     fi
 }