Allow execution of stage2 compiler to happen later

Currently cross-compiled bindists are rather incomplete since we can't run the stage2 compiler to build various utilities (e.g. hp2ps and haddock). Ideally we would be able to run a build up to the point where we need to run host code, package up the build tree, and finish the build on the host. There are a number of challenges that this brings, but it will ultimately make it far easier to build proper non-Linux/amd64 bindists on CircleCI (#14949 (closed)).

Trac metadata

Trac field	Value
Version	8.4.3
Type	FeatureRequest
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Build System
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture

mentioned in issue #14949 (closed)

changed milestone to %8.6.1

changed weight to 5

added Tfeature request Trac import labels

changed milestone to %8.8.1

These won't be fixed for in GHC 8.6.

The new Hadrian build system has been merged. Relabeling the tickets concerning the legacy make build system to prevent confusion.

Trac metadata

Trac field	Value
Component	Build System → Build System (make)

changed milestone to %8.10.1

Bumping milestones of low-priority tickets.

added Pnormal label

changed milestone to %9.0.1

changed milestone to %9.2.1

This will not be fixed in time for %9.2.1

changed milestone to %9.4.1

removed milestone %9.4.1