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[clang][bytecode] Don't diagnose const assignments... #192593

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Merged
tbaederr merged 1 commit into from
Apr 17, 2026
+14 −3
Merged

[clang][bytecode] Don't diagnose const assignments... #192593

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8 changes: 5 additions & 3 deletions clang/lib/AST/ByteCode/Interp.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -579,9 +579,11 @@ bool CheckConst(InterpState &S, CodePtr OpPC, const Pointer &Ptr) {
if (llvm::is_contained(S.InitializingBlocks, Ptr.block()))
return true;

const QualType Ty = Ptr.getType();
const SourceInfo &Loc = S.Current->getSource(OpPC);
S.FFDiag(Loc, diag::note_constexpr_modify_const_type) << Ty;
if (!S.checkingPotentialConstantExpression()) {
const QualType Ty = Ptr.getType();
const SourceInfo &Loc = S.Current->getSource(OpPC);
S.FFDiag(Loc, diag::note_constexpr_modify_const_type) << Ty;
}
return false;
}

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9 changes: 9 additions & 0 deletions clang/test/AST/ByteCode/cxx20.cpp
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Expand Up @@ -1345,3 +1345,12 @@ namespace ExpandOnOPTEPointers {
}
static_assert(test());
}

namespace ConstIntPotentialConstantExpr {
/// NO error about a constexpr function that's never a constant expression.
constexpr int Const() {
const int a = 10; // both-note {{declared const here}}
a = 20; // both-error {{cannot assign to variable 'a' with const-qualified type 'const int'}}
return 1;
}
}