esp32 temperature node

ESP32-IDF_Temperture-Node-v2/managed_components/esp-idf-lib__i2cdev/common/cmake/esp-idf-lib.cmake

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+# Set common build flags but enable them only when the build is in our CI,
+# making them optional. The idea is, fail when compiled in our CI but just
+# warn in any other cases. Code that compiles with one toolchain warning-free
+# may not do so with another toolchain, which creates a project dependency on
+# specific toolchain vendors and versions.
+#
+# Define flags that may cause failures here.
+if (DEFINED ENV{ESP_IDF_LIB_CI})
+    set(ESP_IDF_LIB_CI_FLAGS
+        -Werror=unused-variable
+        -Werror=unused-function
+        -Werror=write-strings
+        -Werror
+    )
+endif()
+
+# Set common build flags. Mandatory.
+#
+# Define flags that do not cause failures here.
+set(ESP_IDF_LIB_FLAGS
+    -Wextra
+    -Wwrite-strings
+    -Wunused-variable
+    -Wunused-function
+    -Wreturn-type
+)
+
+# When COMPONENT_LIB is INTERFACE_LIBRARY, or a header-only library, do not
+# set the flags.
+get_target_property(COMPONENT_TYPE ${COMPONENT_LIB} TYPE)
+if(NOT COMPONENT_TYPE STREQUAL "INTERFACE_LIBRARY")
+    target_compile_options(${COMPONENT_LIB} PRIVATE
+        ${ESP_IDF_LIB_FLAGS}
+        ${ESP_IDF_LIB_CI_FLAGS}
+    )
+endif()