From 95dd8f1001488be6b58b9f9ad26c118c93313a7c Mon Sep 17 00:00:00 2001
From: Ivan Grokhotkov <ivan@espressif.com>
Date: Tue, 19 Apr 2022 16:54:45 +0200
Subject: [PATCH] cmake: add dependency on esp_timer component

Public header file of esp-modbus (freemodbus/port/port.h) includes
esp_timer.h, which is provided by esp_timer component. Currently
this works without declaring a dependency on esp_timer because
of a transitive dependency on esp_timer via freertos component.
This will be changed in IDF v5.0, where freertos will no longer
have a public dependency on esp_timer. This commit makes esp-modbus
compatible with that future change.
---
 CMakeLists.txt | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0f773ae..5d2a64a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -59,7 +59,14 @@ add_prefix(priv_include_dirs "${CMAKE_CURRENT_LIST_DIR}/freemodbus/" ${priv_incl
 
 message(STATUS "DEBUG: Use esp-modbus component folder: ${CMAKE_CURRENT_LIST_DIR}.")
 
+set(requires driver lwip)
+
+# esp_timer component was introduced in v4.2
+if("${IDF_VERSION_MAJOR}.${IDF_VERSION_MINOR}" VERSION_GREATER "4.1")
+    list(APPEND requires esp_timer)
+endif()
+
 idf_component_register(SRCS "${srcs}"
                     INCLUDE_DIRS "${include_dirs}"
                     PRIV_INCLUDE_DIRS "${priv_include_dirs}"
-                    REQUIRES driver lwip)
+                    REQUIRES ${requires})