Dump-class-layout uses the lldb python bindings. Maybe those are not available 
on your platform?

I think we’ve only ever tried it on macOS. What platform are you trying on?

Simon

> On Nov 4, 2018, at 12:43 PM, Frank Jaeger <fjaege...@outlook.com> wrote:
> 
> Hello. First of all I'm really sorry if this is the wrong mailing list to 
> post to, webkit-help would have probably been better but it doesn't seem very 
> active.
> 
> I run into some problems while trying to use the dump-class-layout script 
> (found in Tools/Scripts/). I built WebKit using the build-webkit script with 
> the --debug flag.
> 
> After building, I tried to run the dump-class-layout script with the 
> following arguments:
> 
> ./Tools/Scripts/dump-class-layout --architecture=x86_64 -c Debug 
> JavaScriptCore JSString
> 
> I also tried different frameworks and classes. The script always fails 
> telling me that "no type matches x in y" where x is the class name I used in 
> the run and y is the framework name.
> 
> Why is this happening? The script is correctly finding the built and 
> symbolicated framework image, so why is it not working properly? Thanks in 
> advance.
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