https://github.com/hokein created
https://github.com/llvm/llvm-project/pull/97408
The lifetime_pointer case is handled before the assignment case. In some
scenario where we have the gsl::Pointer attr, we will end up with emitting the
`-Wdangling-gsl` warning for the assignment case. This means we can not use
`-Wno-dangling-assignment` to suppress the newly-added warning.
>From d1ea90918702fec85714bdd9caa68942eb4a4218 Mon Sep 17 00:00:00 2001
From: Haojian Wu <hokein...@gmail.com>
Date: Tue, 2 Jul 2024 14:12:36 +0200
Subject: [PATCH] [clang] Don't emit the warn_dangling_lifetime_pointer
diagnostic for the assignment case.
The lifetime_pointer case is handled before the assignment case. In some
scenario where we have the gsl::Pointer attr, we will end up with
emitting the `-Wdangling-gsl` warning for the assignment case. This
means we can not use `-Wno-dangling-assignment` to suppress the
newly-added warning.
---
clang/lib/Sema/CheckExprLifetime.cpp | 2 +-
.../test/SemaCXX/suppress-dangling-assignment.cpp | 15 +++++++++++++++
2 files changed, 16 insertions(+), 1 deletion(-)
create mode 100644 clang/test/SemaCXX/suppress-dangling-assignment.cpp
diff --git a/clang/lib/Sema/CheckExprLifetime.cpp
b/clang/lib/Sema/CheckExprLifetime.cpp
index fea0239f7bc36..03bf87a7cf5e6 100644
--- a/clang/lib/Sema/CheckExprLifetime.cpp
+++ b/clang/lib/Sema/CheckExprLifetime.cpp
@@ -1023,7 +1023,7 @@ static void checkExprLifetimeImpl(Sema &SemaRef,
return false;
}
- if (IsGslPtrInitWithGslTempOwner && DiagLoc.isValid()) {
+ if (InitEntity && IsGslPtrInitWithGslTempOwner && DiagLoc.isValid()) {
SemaRef.Diag(DiagLoc, diag::warn_dangling_lifetime_pointer)
<< DiagRange;
return false;
diff --git a/clang/test/SemaCXX/suppress-dangling-assignment.cpp
b/clang/test/SemaCXX/suppress-dangling-assignment.cpp
new file mode 100644
index 0000000000000..11625d3272b83
--- /dev/null
+++ b/clang/test/SemaCXX/suppress-dangling-assignment.cpp
@@ -0,0 +1,15 @@
+
+// RUN: %clang_cc1 -std=c++20 -verify -Wno-dangling-assignment %s
+// expected-no-diagnostics
+
+namespace std {
+// std::basic_string has a hard-coded gsl::owner attr.
+struct basic_string {
+ const char* c_str();
+};
+} // namespace std
+
+void test(const char* a) {
+ // verify that the dangling-assignment diagnostic are suppressed.
+ a = std::basic_string().c_str();
+}
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