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Add rpath to liblldb so vendors can ship their own python framework (or others)

Authored by António Afonso <aadsm@fb.com> on Nov 11 2019, 1:39 PM.

Description

Add rpath to liblldb so vendors can ship their own python framework (or others)

Summary:
I want to be able to specify which python framework to use for lldb in macos. With python2.7 we could just rely on the MacOS one but python3.7 is not shipped with the OS.
An alternative is to use the one shipped with Xcode but that could be path dependent or maybe the user doesn't have Xcode installed at all.
A definite solution is to just ship a python framework with lldb. To make this possible I added "@loader_path/../../../" to the rpath so it points to the same directory as the LLDB.framework, this way we can just drop any frameworks there.

Reviewers: hhb, sgraenitz, xiaobai, smeenai, beanz, labath

Reviewed By: labath

Subscribers: beanz, labath, mgorny, lldb-commits

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D69931