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  VS Arduino › Visual Micro › Visual Studio 2017, 2019, 2022 › How to enable highest warning level for compiler
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Normal Topic How to enable highest warning level for compiler (Read 1371 times)
Cong Quyen Knight
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How to enable highest warning level for compiler
Dec 31st, 2021 at 11:38am
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Hi Tim,

As title, I wonder how to enable highest warning lever for compiler.
I got an issue that hardly to determine root cause. Return void for non-void function cause unexpected behavior. After I found root cause, I realize compiler not show any warning for this type of error.
I try to look at setting, but no such config for that setting. Does VM support that, or Arduino not support from the beginning?
  
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Tim@Visual Micro
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Re: How to enable highest warning level for compiler
Reply #1 - Jan 1st, 2022 at 2:59am
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Did you see the Warnings setting on the vMicro>Compiler menu. Do you want to increase above that?
  
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Cong Quyen Knight
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Re: How to enable highest warning level for compiler
Reply #2 - Jan 3rd, 2022 at 3:30am
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Hi Tim,

I've already saw those Compiler Warning setting (For Project, for Library, for Core)
But after enable them, compiler only warning as -Wall. And not warning about mentioned case.
  
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Simon@Visual Micro
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Re: How to enable highest warning level for compiler
Reply #3 - Jan 4th, 2022 at 5:08pm
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If you go to vMicro > Project Properties > Configuration Extra Flags Project, and add the below value:
Code
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-Werror=return-type

Then click out of the value box and rebuild the project it should now throw an error on build as desired.




This is also worth reporting to the author of the core you are using, as some cores already include this by default (e.g. ESP8266) in the below properties (these can be seen for your project by enabling vMicro > Compiler > Show Build Properties):
Code
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compiler.warning_flags=-w -Werror=return-type
compiler.warning_flags.none=-w -Werror=return-type
compiler.warning_flags.default=-Werror=return-type
compiler.warning_flags.more=-Wall -Werror=return-type
compiler.warning_flags.all=-Wall -Wextra -Werror=return-type
  
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