cabal-install cannot pass package ids to the build process

[bos]

(Imported from Trac #937, reported by @kosmikus on 2012-04-05)

The solver determines an install plan that fixes package ids of installed packages.

However, the Setup interface currently does not allow us to specify package ids once we start building; we can only fix the versions.

This can lead to problems in situations where multiple instances of the same package version are installed on a system, and the install plan selects one, but we cannot uniquely communicate that to the builder.

[bos]

(Imported comment by @kosmikus on 2012-04-05)

Also see #470.

[BardurArantsson]

This is very old. Also, it was my impression that package IDs aren't actually stable until a package is built? (Which would make this an impossibility.)

Request close.