sberg created this revision.
sberg added reviewers: doug.gregor, aaron.ballman.
sberg added a project: clang.
Herald added a project: All.
sberg requested review of this revision.
...rather than on potentially just a declaration.
Without the fix, the newly added
`clang/test/SemaCXX/warn-undefined-internal.cpp` failed with
error: 'warning' diagnostics expected but not seen:
File
/home/sbergman/github.com/llvm/llvm-project/clang/test/SemaCXX/warn-undefined-internal.cpp
Line 12 (directive at
/home/sbergman/github.com/llvm/llvm-project/clang/test/SemaCXX/warn-undefined-internal.cpp:13):
function 'test2()::S::f' has internal linkage but is not defined
error: 'note' diagnostics expected but not seen:
File
/home/sbergman/github.com/llvm/llvm-project/clang/test/SemaCXX/warn-undefined-internal.cpp
Line 14 (directive at
/home/sbergman/github.com/llvm/llvm-project/clang/test/SemaCXX/warn-undefined-internal.cpp:15):
used here
(I ran into this when two LibreOffice Clang plugins produced false positive
warnings, as they relied on `Decl::isReferenced()` returning true for such
virtual member functions of local classes.)
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D145123
Files:
clang/lib/Sema/SemaDeclCXX.cpp
clang/test/SemaCXX/warn-undefined-internal.cpp
Index: clang/test/SemaCXX/warn-undefined-internal.cpp
===================================================================
--- /dev/null
+++ clang/test/SemaCXX/warn-undefined-internal.cpp
@@ -0,0 +1,16 @@
+// RUN: %clang_cc1 -fsyntax-only -Wundefined-internal -verify %s
+
+void test1() {
+ struct S { virtual void f(); };
+ // expected-warning@-1{{function 'test1()::S::f' has internal linkage but is
not defined}}
+ S s;
+ // expected-note@-1{{used here}}
+}
+
+void test2() {
+ struct S;
+ struct S { virtual void f(); };
+ // expected-warning@-1{{function 'test2()::S::f' has internal linkage but is
not defined}}
+ S s;
+ // expected-note@-1{{used here}}
+}
Index: clang/lib/Sema/SemaDeclCXX.cpp
===================================================================
--- clang/lib/Sema/SemaDeclCXX.cpp
+++ clang/lib/Sema/SemaDeclCXX.cpp
@@ -17975,7 +17975,7 @@
// immediately. For all other classes, we mark their virtual members
// at the end of the translation unit.
if (Class->isLocalClass())
- MarkVirtualMembersReferenced(Loc, Class);
+ MarkVirtualMembersReferenced(Loc, Class->getDefinition());
else
VTableUses.push_back(std::make_pair(Class, Loc));
}
Index: clang/test/SemaCXX/warn-undefined-internal.cpp
===================================================================
--- /dev/null
+++ clang/test/SemaCXX/warn-undefined-internal.cpp
@@ -0,0 +1,16 @@
+// RUN: %clang_cc1 -fsyntax-only -Wundefined-internal -verify %s
+
+void test1() {
+ struct S { virtual void f(); };
+ // expected-warning@-1{{function 'test1()::S::f' has internal linkage but is not defined}}
+ S s;
+ // expected-note@-1{{used here}}
+}
+
+void test2() {
+ struct S;
+ struct S { virtual void f(); };
+ // expected-warning@-1{{function 'test2()::S::f' has internal linkage but is not defined}}
+ S s;
+ // expected-note@-1{{used here}}
+}
Index: clang/lib/Sema/SemaDeclCXX.cpp
===================================================================
--- clang/lib/Sema/SemaDeclCXX.cpp
+++ clang/lib/Sema/SemaDeclCXX.cpp
@@ -17975,7 +17975,7 @@
// immediately. For all other classes, we mark their virtual members
// at the end of the translation unit.
if (Class->isLocalClass())
- MarkVirtualMembersReferenced(Loc, Class);
+ MarkVirtualMembersReferenced(Loc, Class->getDefinition());
else
VTableUses.push_back(std::make_pair(Class, Loc));
}
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