commit 5b8739fec64e0a78568c56c17fc1ade150908e55
author Bob Haarman <llvm@inglorion.net> Wed Feb 20 00:26:01 2019 +0000
committer Bob Haarman <llvm@inglorion.net> Wed Feb 20 00:26:01 2019 +0000
tree cfbfa1e551c99e74b9afb377ed2f1d6896b0dcd2
parent bcf1836a443d4b7c48485f6d03c818ea4d60a107

[lld-link] preserve @llvm.used symbols in LTO

Summary:
We translate @llvm.used to COFF by generating /include directives
in the .drectve section. However, in LTO links, this happens after
directives have already been processed, so the new directives do
not take effect. This change marks @llvm.used symbols as GCRoots
so that they are preserved as intended.

Fixes PR40733.

Reviewers: rnk, pcc, ruiu

Reviewed By: ruiu

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

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D58255

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@354410 91177308-0d34-0410-b5e6-96231b3b80d8