[lld] Mark operator== const to avoid ambiguity in C++20. (PR #68119)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-lld

<details>
<summary>Changes</summary>

C++20 will automatically generate an operator== with reversed operand order, which is ambiguous with the written operator== when one argument is marked const and the other isn't.

---
Full diff: https://github.com/llvm/llvm-project/pull/68119.diff


1 Files Affected:

- (modified) lld/COFF/Config.h (+1-1) 


``````````diff
diff --git a/lld/COFF/Config.h b/lld/COFF/Config.h
index e66ab3a32c56721..ff87eab2744dd51 100644
--- a/lld/COFF/Config.h
+++ b/lld/COFF/Config.h
@@ -72,7 +72,7 @@ struct Export {
   StringRef symbolName;
   StringRef exportName; // Name in DLL
 
-  bool operator==(const Export &e) {
+  bool operator==(const Export &e) const {
     return (name == e.name && extName == e.extName &&
             aliasTarget == e.aliasTarget &&
             ordinal == e.ordinal && noname == e.noname &&

``````````

</details>


https://github.com/llvm/llvm-project/pull/68119