From d928465151c8fe103449b6bef4f0ccdd8c254702 Mon Sep 17 00:00:00 2001
From: Ivan Grokhotkov <ivan@espressif.com>
Date: Wed, 12 Sep 2018 20:21:38 +0800
Subject: [PATCH] cmake: use built-in file function to create dummy main

---
 tools/cmake/idf_functions.cmake | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/tools/cmake/idf_functions.cmake b/tools/cmake/idf_functions.cmake
index 9f6474ca1d..8f22ea28bb 100644
--- a/tools/cmake/idf_functions.cmake
+++ b/tools/cmake/idf_functions.cmake
@@ -154,10 +154,7 @@ function(idf_add_executable)
         # Create a dummy file to work around CMake requirement of having a source
         # file while adding an executable
         add_executable(${exe_target} "${CMAKE_CURRENT_BINARY_DIR}/dummy_main_src.c")
-        add_custom_command(OUTPUT dummy_main_src.c
-                        COMMAND echo "" > dummy_main_src.c
-                        WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
-                        VERBATIM)
+        file(WRITE ${CMAKE_CURRENT_BINARY_DIR}/dummy_main_src.c)
 
         add_custom_target(dummy_main_src DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/dummy_main_src.c)