Added a nicer warning message for legacy I2C users.

CMakeLists.txt

@@ -1,7 +1,22 @@
 cmake_minimum_required(VERSION 3.17)
 set(CMAKE_C_STANDARD 11)
+
+if ("${CONFIG_USE_I2C_LEGACY_DRIVER}")
+    if ("$ENV{IDF_VERSION}" VERSION_GREATER_EQUAL "7.0.0")
+        message(SEND_ERROR "[ BMX280 ] The legacy I2C driver has been removed since version 7.0.0. Unless you intended to compile for older IDF versions, change your build configuration to use the I2C master driver.")
+    else()
+        message(WARNING "[ BMX280 ] The legacy I2C driver has been deprecated since version 6.0.0. The driver will not compile with the legacy I2C driver enabled in version 7.0.0 or later.")
+    endif()
+
+    message(STATUS "[ BMX280 ] Using the legacy I2C driver.")
+    set(BMX280_I2C_DRIVER_REQUIRE "driver")
+else()
+    message(STATUS "[ BMX280 ] Using the new I2C master driver.")
+    set(BMX280_I2C_DRIVER_REQUIRE "esp_driver_i2c")
+endif()
+
 idf_component_register(
     SRCS bmx280.c
     INCLUDE_DIRS "include"
-    REQUIRES driver
+    REQUIRES "${BMX280_I2C_DRIVER_REQUIRE}"
 )