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Add META_MODE support.

Description

Add META_MODE support.

Off by default, build behaves normally.
WITH_META_MODE we get auto objdir creation, the ability to
start build from anywhere in the tree.

Still need to add real targets under targets/ to build packages.

Differential Revision: D2796
Reviewed by: brooks imp

Details

Provenance
sjgAuthored on
Reviewer
brooks
Differential Revision
D2796: Base infra for meta mode
Parents
rS284344: MFC r277788:
Branches
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Tags
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