================
@@ -6472,7 +6494,20 @@ void CXXNameMangler::mangleValueInTemplateArg(QualType
T, const APValue &V,
Out << "plcvPcad";
Kind = Offset;
} else {
- if (!V.getLValuePath().empty() || V.isLValueOnePastTheEnd()) {
+ // Clang 11 and before mangled an array subject to array-to-pointer decay
+ // as if it were the declaration itself.
+ bool IsArrayToPointerDecayMangledAsDecl = false;
+ if (TopLevel && Ctx.getLangOpts().getClangABICompat() <=
+ LangOptions::ClangABI::Ver11) {
+ QualType BType = B.getType();
+ IsArrayToPointerDecayMangledAsDecl =
+ BType->isArrayType() && V.getLValuePath().size() == 1 &&
+ V.getLValuePath()[0].getAsArrayIndex() == 0 &&
+ Ctx.hasSimilarType(T, Ctx.getDecayedType(BType));
+ }
+
----------------
bolshakov-a wrote:
This concerns ABI changes which are actually present in Clang since ver. 12. I
think, they have been introduced
[here](https://github.com/llvm/llvm-project/commit/6c365cd31e323d2d075573edd927e4f7fb5ec01c#diff-8a63be2ffd0742a4ce78d229b1bad68c62dd0b95e39d7f9a378bb52ad3f4a0b7R5011).
The changes in this PR are to avoid regression. The test
`CodeGenCXX/clang-abi-compat.cpp` fails if they are removed.
https://github.com/llvm/llvm-project/pull/78041
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