From 4ec9aa9a00adf61aa9e4324cb1fa0ff4aa20bc33 Mon Sep 17 00:00:00 2001
From: Mahavir Jain <mahavir@espressif.com>
Date: Fri, 14 Sep 2018 17:02:37 +0530
Subject: [PATCH] cmake: prefer `version.txt` for IDF_VER if available

---
 tools/cmake/idf_functions.cmake | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tools/cmake/idf_functions.cmake b/tools/cmake/idf_functions.cmake
index 8f22ea28bb..d68eabf628 100644
--- a/tools/cmake/idf_functions.cmake
+++ b/tools/cmake/idf_functions.cmake
@@ -213,7 +213,11 @@ endfunction()
 # Running git_describe() here automatically triggers rebuilds
 # if the ESP-IDF git version changes
 function(idf_get_git_revision)
-    git_describe(IDF_VER "${IDF_PATH}")
+    if(EXISTS "${IDF_PATH}/version.txt")
+        file(STRINGS "${IDF_PATH}/version.txt" IDF_VER)
+    else()
+        git_describe(IDF_VER "${IDF_PATH}")
+    endif()
     add_definitions(-DIDF_VER=\"${IDF_VER}\")
     git_submodule_check("${IDF_PATH}")
     set(IDF_VER ${IDF_VER} PARENT_SCOPE)