Since aedeb8d557, which switched to EPC-based eh-frame registration, the
eh-frame registration functions need to be forcibly linked into the target
process.
We need a general solution to this problem, but for now just force it in this
example to fix the test failures in
https://green.lab.llvm.org/green/job/clang-stage1-RA/31497
rdar://101083784
The example demonstrates how to use a module summary index file produced for ThinLTO to:
* find the module that defines the main entry point
* find all extra modules that are required for the build
A LIT test runs the example as part of the LLVM test suite [1] and shows how to create a module summary index file.
The code also provides two Error types that can be useful when working with ThinLTO summaries.
[1] if LLVM_BUILD_EXAMPLES=ON and platform is not Windows
Differential Revision: https://reviews.llvm.org/D85974
Lang Hames