ESP32 Forum

Posted: **Fri Feb 16, 2024 3:24 pm**

I have enabled -Werror for my main component, but during build something enables -Wno-error=unused-variable (seen on compile_commands.json) which causes unused var warnings to not be considered as errors.

As far as I can see, that is set in esp-idf\make\project.mk:390 (v4.4):

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# Warnings-related flags relevant both for C and C++
COMMON_WARNING_FLAGS = -Wall -Werror=all \
    -Wno-error=unused-function \
    -Wno-error=unused-but-set-variable \
    -Wno-error=unused-variable \
    -Wno-error=deprecated-declarations \
    -Wextra \
    -Wno-unused-parameter -Wno-sign-compare

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How can I override these without modifying esp-idf?

I have tried:
in project\main\CMakeLists.txt:

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target_compile_options(${COMPONENT_LIB} PRIVATE -Wall -Wextra -Werror -Wunused-variable)

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add_compile_options(-Wunused-variable)

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set_source_files_properties(main.c
    PROPERTIES COMPILE_FLAGS
    -Wunused-variable
)

Both individually, and in combinations.

Thank you

Posted: **Sat Feb 17, 2024 10:06 pm**

You can try idf_build_set_property(COMPILE_OPTIONS ...), or, if all else fails, use gcc's diagnostic pragmas in your code.

ESP32 Forum

Disabling -Wno-error=unused-variable for main component

Disabling -Wno-error=unused-variable for main component

Re: Disabling -Wno-error=unused-variable for main component