From 30735b33efabd6cf038bcb258b674cf828ad5ecf Mon Sep 17 00:00:00 2001
From: Frantisek Hrbata <frantisek.hrbata@espressif.com>
Date: Fri, 14 Apr 2023 14:52:21 +0200
Subject: [PATCH] tools: fix make_json_list to return empty json list for empty
 cmake list

Currently make_json_list() returns '[ "" ]' for empty cmake list. Fix this
so empty json list is returned instead.

Signed-off-by: Frantisek Hrbata <frantisek.hrbata@espressif.com>
---
 tools/cmake/utilities.cmake | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/tools/cmake/utilities.cmake b/tools/cmake/utilities.cmake
index 68ce8e16e8..3d47a9351e 100644
--- a/tools/cmake/utilities.cmake
+++ b/tools/cmake/utilities.cmake
@@ -178,7 +178,12 @@ endfunction()
 
 # Convert a CMake list to a JSON list and store it in a variable
 function(make_json_list list variable)
-    string(REPLACE ";" "\", \"" result "[ \"${list}\" ]")
+    list(LENGTH list length)
+    if(${length})
+        string(REPLACE ";" "\", \"" result "[ \"${list}\" ]")
+    else()
+        set(result "[]")
+    endif()
     set("${variable}" "${result}" PARENT_SCOPE)
 endfunction()