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[lld-link] diagnose undefined symbols before LTO when possible

Description

[lld-link] diagnose undefined symbols before LTO when possible

Summary:
This allows reporting undefined symbols before LTO codegen is
run. Since LTO codegen can take a long time, this improves user
experience by avoiding that time spend if the link is going to
fail with undefined symbols anyway.

Fixes PR32400.

Reviewers: ruiu

Reviewed By: ruiu

Subscribers: mehdi_amini, steven_wu, dexonsmith, mstorsjo, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D62434

Details

Committed
inglorionJul 26 2019, 10:56 AM
Reviewer
ruiu
Differential Revision
D62434: [lld-link] diagnose undefined symbols before LTO when possible
Parents
rL367135: Merging r367112:
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