--flavour=quick followed by --flavour=prof fails

Starting from a clean tree I first built successfully with --flavour=quick, I then changed to --flavour=prof and the build failed as follows:

/root/ghc/_build/stage1/rts/build/libCffi_p.a: copyFile: does not exist (No such file or directory)
shakeArgsWith    0.010s    0%                           
Function shake   0.435s    0%                           
Database read    0.670s    0%                           
With database    0.035s    0%                           
Running rules  123.401s   99%  =========================
Total          124.551s  100%                           
Error when running Shake build system:
  at src/Rules.hs:(32,19)-(45,17):
  at src/Rules.hs:45:5-17:
* Depends on: _build/stage1/lib/package.conf.d/rts-1.0.conf
* Raised the exception:
ExitFailure 1

Trac metadata

Trac field	Value
Version	8.6.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Build System (Hadrian)
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