[lld] [LLD][COFF] Set isUsedInRegularObj for target symbols in resolveAlternateNames (PR #154837)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-lld

Author: Jacek Caban (cjacek)

<details>
<summary>Changes</summary>

Fixes: 154595

Prior to commit bbc8346e6bb543b0a87f52114fed7d766446bee1, this flag was set by `insert()` from `addUndefined()`. Set it explicitly now.

---
Full diff: https://github.com/llvm/llvm-project/pull/154837.diff


2 Files Affected:

- (modified) lld/COFF/SymbolTable.cpp (+1) 
- (added) lld/test/COFF/alternatename-lto.ll (+25) 


``````````diff
diff --git a/lld/COFF/SymbolTable.cpp b/lld/COFF/SymbolTable.cpp
index e11d2c6dac83e..0a88807c00dd5 100644
--- a/lld/COFF/SymbolTable.cpp
+++ b/lld/COFF/SymbolTable.cpp
@@ -1399,6 +1399,7 @@ void SymbolTable::resolveAlternateNames() {
       auto toUndef = dyn_cast<Undefined>(toSym);
       if (toUndef && (!toUndef->weakAlias || toUndef->isAntiDep))
         continue;
+      toSym->isUsedInRegularObj = true;
       if (toSym->isLazy())
         forceLazy(toSym);
       u->setWeakAlias(toSym);
diff --git a/lld/test/COFF/alternatename-lto.ll b/lld/test/COFF/alternatename-lto.ll
new file mode 100644
index 0000000000000..c3666cd3501df
--- /dev/null
+++ b/lld/test/COFF/alternatename-lto.ll
@@ -0,0 +1,25 @@
+; REQUIRES: x86
+; RUN: mkdir -p %t.dir
+; RUN: llvm-as -o %t.obj %s
+; RUN: lld-link -out:%t.dll -dll -noentry %t.obj -export:test
+
+target datalayout = "e-m:w-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-windows-msvc19.33.0"
+
+$alt = comdat any
+
+ at alt = weak_odr dso_local global i32 0, comdat, align 4
+ at ext = external dso_local global i32, align 4
+
+; Function Attrs: noinline nounwind optnone uwtable
+define dso_local i32 @test() #0 {
+entry:
+  %0 = load i32, ptr @ext, align 4
+  ret i32 %0
+}
+
+attributes #0 = { noinline nounwind optnone uwtable }
+
+!llvm.linker.options = !{!0}
+
+!0 = !{!"/alternatename:ext=alt"}

``````````

</details>


https://github.com/llvm/llvm-project/pull/154837