Erroneous intellisense error "Identifier is undefined"

Question

Erroneous intellisense error "Identifier is undefined"

CS 20

After updating Visual Studio from 17.0.2 to the latest version, intellisense fails to find typedefs in other files in the following configuration, even in new projects:


typedef float f32;
#include "b.cpp"

f32 foo;

b.cpp is set to "Does not participate in build", i.e. is in the same compilation unit.

Compiles just fine, but f32 foo; is marked red by intellisense with E0020 identifier "f32" is undefined.

Worked before updating.

Viorel 122.6K Reputation points

2023-07-14T18:16:56.9633333+00:00

Because f32 is undefined in b.cpp, I do not think that IntelliSense can be blamed.
CS 20 Reputation points

2023-07-14T19:58:45.1066667+00:00

Like I said, b.cpp is not compiled seperately and so basically just copy-pasted into a.cpp, where f32 is defined.

I think Intellisense should be (and, until updating, was) able to figure that out.
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Viorel 122.6K Reputation points

2023-07-14T18:16:56.9633333+00:00

Because f32 is undefined in b.cpp, I do not think that IntelliSense can be blamed.
CS 20 Reputation points

2023-07-14T19:58:45.1066667+00:00

Like I said, b.cpp is not compiled seperately and so basically just copy-pasted into a.cpp, where f32 is defined.

I think Intellisense should be (and, until updating, was) able to figure that out.
Deleted

This comment has been deleted due to a violation of our Code of Conduct. The comment was manually reported or identified through automated detection before action was taken. Please refer to our Code of Conduct for more information.

Answer 1

Minxin Yu 13,501 Microsoft External Staff

Hi,

I am using Visual Studio Preview latest and occasionally the intellisense worked.

You could report the problem to Developer Community and post link here.

enter image description here

Here's an alternative:

Exclude the b.cpp file from project.

enter image description here

Drag b.cpp to Visual Studio to open(Or click the #include"b.cpp" -> Go to document), and the intellisense will work.

enter image description here

Best regards,

Minxin Yu

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Minxin Yu 13,501 Reputation points Microsoft External Staff

2023-07-19T06:39:21.8666667+00:00

Hi, @CS

May I know if you have got any chance to check my answer?
CS 20 Reputation points

2023-07-19T06:47:22.9833333+00:00

Hi,

throwing the file out of the project alltogether is of course not ideal, but will do as a workaround for the time being, thanks!

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Erroneous intellisense error "Identifier is undefined"

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