diff --git a/llvm/lib/Linker/IRMover.cpp b/llvm/lib/Linker/IRMover.cpp --- a/llvm/lib/Linker/IRMover.cpp +++ b/llvm/lib/Linker/IRMover.cpp @@ -610,15 +610,16 @@ return New; } - // When linking a global for an indirect symbol, it will always be linked. - // However we need to check if it was not already scheduled to satisfy a - // reference from a regular global value initializer. We know if it has been - // schedule if the "New" GlobalValue that is mapped here for the indirect - // symbol is the same as the one already mapped. If there is an entry in the + // If the global is being linked for an indirect symbol, it may have already + // been scheduled to satisfy a regular symbol. Similarly, a global being linked + // for a regular symbol may have already been scheduled for an indirect + // symbol. Check for these cases by looking in the other value map and + // confirming the same value has been scheduled. If there is an entry in the // ValueMap but the value is different, it means that the value already had a // definition in the destination module (linkonce for instance), but we need a - // new definition for the indirect symbol ("New" will be different. - if (ForIndirectSymbol && ValueMap.lookup(SGV) == New) + // new definition for the indirect symbol ("New" will be different). + if ((ForIndirectSymbol && ValueMap.lookup(SGV) == New) || + (!ForIndirectSymbol && IndirectSymbolValueMap.lookup(SGV) == New)) return New; if (ForIndirectSymbol || shouldLink(New, *SGV)) diff --git a/llvm/test/Linker/alias-4.ll b/llvm/test/Linker/alias-4.ll new file mode 100644 --- /dev/null +++ b/llvm/test/Linker/alias-4.ll @@ -0,0 +1,12 @@ +; RUN: llvm-link %s -S -o - | FileCheck %s +target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128" +target triple = "x86_64-apple-macosx10.9" + +; CHECK-DAG: @gv0 = constant i64* @alias +; CHECK-DAG: @gv1 = constant i64 ptrtoint (i64* @gv1 to i64) +; CHECK-DAG: @alias = alias i64, i64* @gv1 + +@gv0 = constant i64* @alias +@gv1 = constant i64 ptrtoint (i64* @gv1 to i64) + +@alias = alias i64, i64* @gv1