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| author | Davide Italiano <davide@freebsd.org> | 2016-03-29 23:57:22 +0000 |
|---|---|---|
| committer | Davide Italiano <davide@freebsd.org> | 2016-03-29 23:57:22 +0000 |
| commit | 49fe4eda4c06b1a29eb9a39bc60b89f5f2f6e97d (patch) | |
| tree | 7c7c237ab9bfbbbd3c5112e7fd82dc19ac2e5fce /lld/ELF/LTO.cpp | |
| parent | b1631d9161ced5a90ec345aaa809ce971a77cf55 (diff) | |
| download | bcm5719-llvm-49fe4eda4c06b1a29eb9a39bc60b89f5f2f6e97d.tar.gz bcm5719-llvm-49fe4eda4c06b1a29eb9a39bc60b89f5f2f6e97d.zip | |
[LTO] Add a comment to explain how we handle @llvm.used.
Requested by: Rui Ueyama.
llvm-svn: 264809
Diffstat (limited to 'lld/ELF/LTO.cpp')
| -rw-r--r-- | lld/ELF/LTO.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/lld/ELF/LTO.cpp b/lld/ELF/LTO.cpp index 63fb6e3a3a5..b1d5d60b878 100644 --- a/lld/ELF/LTO.cpp +++ b/lld/ELF/LTO.cpp @@ -78,6 +78,10 @@ void BitcodeCompiler::add(BitcodeFile &F) { ArrayRef<SymbolBody *> Bodies = F.getSymbols(); Module &M = Obj->getModule(); + + // If a symbol appears in @llvm.used, the linker is required + // to treat the symbol as there is a reference to the symbol + // that it cannot see. Therefore, we can't internalize. SmallPtrSet<GlobalValue *, 8> Used; collectUsedGlobalVariables(M, Used, /* CompilerUsed */ false); |
