Compiler warning: cast from pointer to integer of different size

While building the stage1 compiler:

In file included from rts/Capability.h:25:0,
                 from includes/dist-derivedconstants/header/tmp.c:15:
rts/Task.h: In function 'serialiseTaskId':
rts/Task.h:318:12: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
     return (TaskId) taskID;
            ^

I'm building a cross-compiler with build/host=x86_64-linux-gnu and target=mips-unknown-linux-musl

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Trac field	Value
Version
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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