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[4.22] Compilation Triggers UnrealHeaderTool even only one .cpp file changed

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  • replied
    Sorry I had hard time tracking my post in this forum.

    I had reported the issue to EPIC support. Here's the link: https://issues.unrealengine.com/issue/UE-74102

    Please vote if you have encountered the issue too.

    It seems that if you build the engine from Github it won't have this problem, but I haven't tested it personally.

    Leave a comment:


  • replied
    Has anyone reported this yet?

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  • replied
    Apparently there is a bug in 4.22 where if you use a launcher build, UHT runs every time.

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  • replied
    Yeah I'm generally experiencing the same thing, which is strange considering the release notes outlined how this area saw huge speed increases.

    Just curious, are you guys using VS 2019 or 2017?

    Leave a comment:


  • replied
    I'm seeing the same thing.. while this is not a big problem on my workstation (UHT takes 5s there for my project) the same project needs up to 60s for the reflection code on my laptop (with an i7 @ 2.8Ghz), which is a steep increase from before..

    Leave a comment:


  • [4.22] Compilation Triggers UnrealHeaderTool even only one .cpp file changed

    After migrating to 4.22 I notice that the reflection code generation take a big chunk of the compilation time.

    Before 4.22 the UHT only runs when there are changes in header files, but now every tiny change in .cpp seems to invoke UHT.

    Is there any setting I miss? Or this is intentional in 4.22?
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