do_cmake.sh: update build type warning

also, use printf instead of cat<<

Signed-off-by: Matan Breizman <[email protected]>
(cherry picked from commit fc7597d)

Author: Matan-B

do_cmake.sh

@@ -105,13 +105,20 @@ EOF
 echo done.
 
 if [[ ! "$ARGS $@" =~ "-DCMAKE_BUILD_TYPE" ]]; then
-  cat <<EOF
-
+    if [ -d ../.git ]; then
+        printf "
 ****
-WARNING: do_cmake.sh now creates debug builds by default. Performance
-may be severely affected. Please use -DCMAKE_BUILD_TYPE=RelWithDebInfo
+WARNING: do_cmake.sh now creates debug builds by default if .git exists.
+Performance may be severely affected. Please use -DCMAKE_BUILD_TYPE=RelWithDebInfo
 if a performance sensitive build is required.
 ****
-EOF
+"
+    else
+        printf "
+****
+WARNING: do_cmake.sh now creates RelWithDebInfo builds by default when .git is absent.
+****
+"
+    fi
 fi