It has been long since this was reported. Today Alexey said he had found
the reason. He believed that 899af040b0 was causing the failure [1].
After reverting it the x64 bootstrap succeeded, however the x86
bootstrap failed with an ICE [2].
So now we have two issues here. Should we file a new PR for the first
one? It seems a regression however. I am not familiar with Ada so I am
looking forward to your help. Thanks.
[1]
https://github.com/Alexpux/MINGW-packages/pull/3877#issuecomment-408651809
[2]
https://github.com/Alexpux/MINGW-packages/pull/3877#issuecomment-408667559
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Best regards,
LH_Mouse