Warning treated as an error (may be used uninitialized in this function)

Asked Aug 24 '21 at 22:21

Active Aug 24 '21 at 22:21

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I am trying to write some code for SPI communication between an ESP32 microcontroller and a sensor. I am also using an external library for that. The IDE is VScode Version 1.59.1 and the ESP-IDF Explorer extension is being used to compile the code.

The following warning is being treated as an error as given by the logs:

C:/Documents/XYZ/JKL/paths/esp-idf/components/SPIbus/src/SPIbus.cpp:209:12: error: '*((void*)& transaction +32)' may be used uninitialized in this function [-Werror=maybe-uninitialized]

     rxdata = *(uint32_t*)transaction.rx_data;
     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Here, transaction.rx_data is an uint8_t array. I can initialize the array to make the error go away, but then the SPI communication produces invalid values.

Can someone please tell me how can I remove the warning be read as an error? Any help will be greatly appreciated.

asked Aug 24 '21 at 22:21

Curious94

1

I think you add `-Wno-error=maybe-uninitialized` – NathanOliver Aug 24 '21 at 22:25
@NathanOliver Thanks for the feedback. Can you tell me where should I add this code? I am new to this framework and there are many files. – Curious94 Aug 24 '21 at 22:26
I've not used VSCode. This should help you with that: https://stackoverflow.com/a/57173879/4342498 – NathanOliver Aug 24 '21 at 22:29
What *is* writing the data to this? Is this some memory mapped object? – JohnFilleau Aug 24 '21 at 22:34

Warning treated as an error (may be used uninitialized in this function)

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