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[libcxx] Capture configuration information when installing the libc++ headers

Authored by EricWF on Oct 13 2015, 3:12 PM.

Description

[libcxx] Capture configuration information when installing the libc++ headers

Summary:
Hi all,

This patch is a successor to D11963. However it has changed dramatically and I felt it would be best to start a new review thread.

Please read the design documentation added in this patch for a description of how it works.

Reviewers: mclow.lists, danalbert, jroelofs, EricWF

Subscribers: vkalintiris, rnk, ed, espositofulvio, asl, eugenis, cfe-commits

Differential Revision: http://reviews.llvm.org/D13407

llvm-svn: 250235