https://github.com/abhijeetsharma200 created
https://github.com/llvm/llvm-project/pull/186634
When an explicit function template specialization is deleted, the overload
candidate `Fn` may be a non-canonical `FunctionDecl` where `IsDeleted` is not
set, even though the canonical decl has it set. `isDeletedAsWritten()` reads
`this` while `isDeleted()` reads `getCanonicalDecl()`, causing the mismatch.
Fix by using `getCanonicalDecl()` consistently in the diagnostic.
Fixes #185693
>From c1ab56065998187504e674d4cf88e83b811e865c Mon Sep 17 00:00:00 2001
From: Abhijeet Sharma <[email protected]>
Date: Sat, 14 Mar 2026 23:28:39 +0100
Subject: [PATCH] [clang] Fix 'implicitly deleted' diagnostic for explicitly
deleted function template specializations, fixes #185693
---
clang/lib/Sema/SemaOverload.cpp | 4 +++-
clang/test/SemaCXX/deleted-template-spec-diag.cpp | 12 ++++++++++++
2 files changed, 15 insertions(+), 1 deletion(-)
create mode 100644 clang/test/SemaCXX/deleted-template-spec-diag.cpp
diff --git a/clang/lib/Sema/SemaOverload.cpp b/clang/lib/Sema/SemaOverload.cpp
index 97018dbe81057..1ca340e8b72c7 100644
--- a/clang/lib/Sema/SemaOverload.cpp
+++ b/clang/lib/Sema/SemaOverload.cpp
@@ -12841,7 +12841,9 @@ static void NoteFunctionCandidate(Sema &S,
OverloadCandidate *Cand,
S.Diag(Fn->getLocation(), diag::note_ovl_candidate_deleted)
<< (unsigned)FnKindPair.first << (unsigned)FnKindPair.second <<
FnDesc
- << (Fn->isDeleted() ? (Fn->isDeletedAsWritten() ? 1 : 2) : 0);
+ << (Fn->isDeleted()
+ ? (Fn->getCanonicalDecl()->isDeletedAsWritten() ? 1 : 2)
+ : 0);
MaybeEmitInheritedConstructorNote(S, Cand->FoundDecl);
return;
}
diff --git a/clang/test/SemaCXX/deleted-template-spec-diag.cpp
b/clang/test/SemaCXX/deleted-template-spec-diag.cpp
new file mode 100644
index 0000000000000..fe224b83c808d
--- /dev/null
+++ b/clang/test/SemaCXX/deleted-template-spec-diag.cpp
@@ -0,0 +1,12 @@
+// RUN: %clang_cc1 -std=c++11 -verify %s
+
+// https://github.com/llvm/llvm-project/issues/185693
+// Explicitly deleted function template specializations were incorrectly
+// reported as "implicitly deleted" in overload resolution diagnostics.
+
+template <typename T> void fred(const T &x);
+template <> void fred(const double &) = delete; // expected-note {{explicitly
deleted}}
+
+int main() {
+ fred(8.0); // expected-error {{call to deleted function 'fred'}}
+}
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