Can IWYU use forward declarations in header, but full includes in cpp?

[Jo Huang]

Hello,

I hope this is the right place to ask.

I’m wondering if IWYU can support this kind of behavior:

• In header files, I want to use forward declarations to keep includes minimal.

• In cpp files, I prefer to use full includes to make things simple.

From what I see, IWYU applies the same rules to both .h and .cpp files.

Is it possible to configure them separately?

Thank you very much for your help!

[Andrey Bolshakov]

I think the problem here is that IWYU suggests forward-declarations in .cpp-files which is almost definitely useless and thus annoying. Currently, it is not configurable, but patches are welcome!

Andrey Bolshakov a.k.a. Ali Khan

ср, 30 июл. 2025 г. в 10:03, Jo Huang <joap...@gmail.com>:

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