Improve diagnostic to tell you a type is incomplete.
I recently ran into this code:
```
\#include <iostream>
void foo(const std::string &s, const std::string& = "");
\#include <string>
void test() { foo(""); }
```
The diagnostic produced said it can't bind char[1] to std::string
const&. It didn't mention std::string is incomplete. The user had to
infer that.
This patch causes the diagnostic to now say "incomplete type".
llvm-svn: 352927
diff --git a/clang/include/clang/Basic/DiagnosticSemaKinds.td b/clang/include/clang/Basic/DiagnosticSemaKinds.td
index 4271833..cf4b71a 100644
--- a/clang/include/clang/Basic/DiagnosticSemaKinds.td
+++ b/clang/include/clang/Basic/DiagnosticSemaKinds.td
@@ -1828,8 +1828,9 @@
"'volatile'|'const' and 'volatile'|'restrict' and 'volatile'|"
"'const', 'restrict', and 'volatile'}2 qualifier%plural{1:|2:|4:|:s}2">;
def err_reference_bind_failed : Error<
- "reference %diff{to type $ could not bind to an %select{rvalue|lvalue}1 of "
- "type $|could not bind to %select{rvalue|lvalue}1 of incompatible type}0,2">;
+ "reference %diff{to %select{type|incomplete type}1 $ could not bind to an "
+ "%select{rvalue|lvalue}2 of type $|could not bind to %select{rvalue|lvalue}2 of "
+ "incompatible type}0,3">;
def err_reference_bind_init_list : Error<
"reference to type %0 cannot bind to an initializer list">;
def err_init_list_bad_dest_type : Error<
diff --git a/clang/lib/Sema/SemaInit.cpp b/clang/lib/Sema/SemaInit.cpp
index c1a7d47..6b9270a 100644
--- a/clang/lib/Sema/SemaInit.cpp
+++ b/clang/lib/Sema/SemaInit.cpp
@@ -8450,6 +8450,7 @@
case FK_ReferenceInitFailed:
S.Diag(Kind.getLocation(), diag::err_reference_bind_failed)
<< DestType.getNonReferenceType()
+ << DestType.getNonReferenceType()->isIncompleteType()
<< OnlyArg->isLValue()
<< OnlyArg->getType()
<< Args[0]->getSourceRange();
diff --git a/clang/test/SemaCXX/cxx0x-initializer-stdinitializerlist.cpp b/clang/test/SemaCXX/cxx0x-initializer-stdinitializerlist.cpp
index f371891..9a82ec4 100644
--- a/clang/test/SemaCXX/cxx0x-initializer-stdinitializerlist.cpp
+++ b/clang/test/SemaCXX/cxx0x-initializer-stdinitializerlist.cpp
@@ -327,7 +327,7 @@
struct A {};
template <typename T, typename F, int... I>
std::initializer_list<T> ExplodeImpl(F p1, A<int, I...>) {
- // expected-error@+1 {{reference to type 'const update_rbrace_loc_crash::Incomplete' could not bind to an rvalue of type 'void'}}
+ // expected-error@+1 {{reference to incomplete type 'const update_rbrace_loc_crash::Incomplete' could not bind to an rvalue of type 'void'}}
return {p1(I)...};
}
template <typename T, int N, typename F>
diff --git a/clang/test/SemaCXX/decl-init-ref.cpp b/clang/test/SemaCXX/decl-init-ref.cpp
index 42b9286..fb5ca8c 100644
--- a/clang/test/SemaCXX/decl-init-ref.cpp
+++ b/clang/test/SemaCXX/decl-init-ref.cpp
@@ -36,3 +36,12 @@
int f();
const A &c = { 10, ++c.temporary };
}
+
+namespace IncompleteTest {
+ struct String;
+ // expected-error@+1 {{reference to incomplete type 'const IncompleteTest::String' could not bind to an lvalue of type 'const char [1]'}}
+ void takeString(const String& = "") {} // expected-note {{passing argument to parameter here}} expected-note {{candidate function}}
+ void test() {
+ takeString(); // expected-error {{no matching function for call}}
+ }
+}