https://bugs.llvm.org/show_bug.cgi?id=39118
Bug ID: 39118
Summary: Visibility attribute ignored on static data member
explicit instantiation
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Frontend
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Visibility attributes applied to explicit instantiations of non-static data
members appear to be ignored by Clang. In the following example, I apply hidden
visibility to everything in the namespace, but I explicitly instantiate
Bar<int>::foo with default visibility. The expected behavior is that
Bar<int>::foo is given default visibility, but the actual behavior is that is
has hidden visibility.
-----------------------------------------------------------
// RUN: %clang_cc1 -emit-llvm %s -o - | FileCheck %s
#define HIDDEN __attribute__((__visibility__("hidden")))
#define VISIBLE __attribute__((__visibility__("default")))
namespace ns HIDDEN {
struct Foo { };
template <typename T>
struct Bar {
static Foo foo;
};
template <typename T>
Foo Bar<T>::foo;
// CHECK: @_ZN2ns3BarIiE3fooE = weak_odr global
// CHECK-NOT: hidden
template VISIBLE Foo Bar<int>::foo;
}
-----------------------------------------------------------
This test case should work inside the llvm-lit test suite. It can also be run
as `clang++ t.cpp -shared | nm`, and then you can notice that `Bar<int>::foo`
is not exported from the generated executable:
0000000000001000 d __ZN2ns3BarIiE3fooE
U dyld_stub_binder
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