Bug 375751

Summary:	Allow ROOT=/prefix steps to reuse binary packages created for ROOT=/ during previous steps of the same emerge run
Product:	Portage Development	Reporter:	Dennis Schridde <dschridde+gentoobugs>
Component:	Conceptual/Abstract Ideas	Assignee:	Portage team <dev-portage>
Status:	CONFIRMED ---
Severity:	enhancement
Priority:	Normal
Version:	unspecified
Hardware:	All
OS:	Linux
Whiteboard:
Package list:		Runtime testing required:	---
Bug Depends on:
Bug Blocks:	137867

Description Dennis Schridde 2011-07-20 10:18:14 UTC

Often during emerging for ROOT=/prefix/... the same package is first build for ROOT=/ and then again for ROOT=/prefix/... It would be nice if portage could reuse the previously build binpkgs.

Possible problems:
* The build for ROOT=/ happens during the same run of emerge. Hence no dependency recalculation happens in between.

Possible solutions (alternatives):
* Know in advance that a binpkg will be build during a certain step and consider this for the following steps.
* Search in each step for binpkgs before starting the actual merge.
* ... your idea ...

Reproducible: Always