ESP32 Forum

Posted: **Wed Oct 14, 2020 5:09 am**

Hi,
I'm trying to integrate a third party library with the IDF.
When I try to compile I get the following error

 error: 'func' may be used uninitialized in this function [-Werror=maybe-uninitialized]

I'm looking at cmakelists.txt target_compile_options but I cant find any examples of how to disable the warning
Any help would be appreciated,

Thanks

Posted: **Wed Oct 14, 2020 5:03 pm**

The compiler flag your looking for is -Wno-maybe-uninitialized.

Best Regards

Posted: **Wed Oct 14, 2020 9:43 pm**

Thanks @nvannote

The compiler flag your looking for is -Wno-maybe-uninitialized.

Do you have an example on how to switch it off. Its seems on my default

I've tried

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target_compile_options(${COMPONENT_LIB} PRIVATE -Wno-maybe-uninitialized=0)

but that didn't work
looking at https://docs.espressif.com/projects/esp ... -variables
It seems I need to switch it off in the root cmakelists.txt

I've tried

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cmake_minimum_required(VERSION 3.5)

set(WARN_UNINITIALIZED 0)

include($ENV{IDF_PATH}/tools/cmake/project.cmake)
project(proj)

but that didn't work either. It maybe my syntax is wrong. I'm still getting familiar with cmake

Posted: **Thu Oct 15, 2020 2:54 am**

I have done this with IDF in the past. In my case I was porting a library specifically as a component.

After your idf_component_register, you can add a line...

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set_target_properties(${COMPONENT_LIB} PROPERTIES COMPILE_FLAGS -Wno-maybe-uninitialized)

In my case, and perhaps you would like to do similar; I singled out the specific offending source file.

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set_source_files_properties(your/path/to/source/file/here.c PROPERTIES COMPILE_FLAGS -Wno-maybe-uninitialized)

Best Regards

Footnote:

While this will get around the immediate issue, I will note that compilers are pretty good at catching such things and rarely make a fuss unless its real. I would take a look at the source in question and verify and/or bring it to the attention of the maintainer of the library.

Posted: **Thu Oct 15, 2020 7:39 am**

@ nvannote
Brilliant!
That works perfectly.

Thank you vary much

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