http://llvm.org/bugs/show_bug.cgi?id=19266
Bug ID: 19266
Summary: C++11-style sizeof does not compile in certain cases.
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: C++11
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
Consider this artificial code:
struct foo
{
int bar;
};
template <typename T>
struct A { };
template <typename T>
struct B : public A<T>
{
void baz()
{
enum { count = sizeof(foo::bar) };
}
};
int main(int, char *[])
{
B<int>().baz();
return 0;
}
clang++ -std=c++11 bug.cpp produces following output:
bug.cpp:14:36: fatal error: 'foo::bar' is not a member of class 'B<int>'
enum { count = sizeof(foo::bar) };
~~~~~^
bug.cpp:20:14: note: in instantiation of member function 'B<int>::baz'
requested here
B<int>().baz();
I see this error with both clang 3.4 on Linux and 3.5.r203967 snapshot on
Windows, so I
suppose that it fails in trunk too (can't test it unfortunately). Compilation
does not
fail if:
- B::baz is turned into static function;
- enum is moved to struct B's scope;
- I use sizeof(static_cast<foo*>(0)->bar) instead of sizeof(foo::bar);
- A and/or B are not template types.
GCC 4.8 compiles this code without errors.
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