https://llvm.org/bugs/show_bug.cgi?id=30391
Bug ID: 30391
Summary: GCC produces ABI-incompatible libc++ dylibs
Product: libc++
Version: unspecified
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
GCC handles _LIBCPP_INLINE_VISIBILITY differently than Clang. In particular
when the attributes are applied to symbols which are externally instantiated.
For example in the reproducer below Clang will emit both 'foo' and 'bar' with
default visibility while GCC only emits a non-hidden 'foo'.
// RUN: g++ -std=c++11 -shared -O3 test.cpp && sym_extract.py a.out
// RUN: clang++ -std=c++11 -shared -O3 test.cpp && sym_extract.py a.out
template <class T>
struct Foo {
void foo();
void bar();
};
template <class T>
void Foo<T>::foo() {}
template <class T>
inline __attribute__((visibility("hidden"), always_inline))
void Foo<T>::bar() {}
template struct Foo<int>;
One way to fix this would be to add _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY
which is defined as __attribute__((visibility("default"), always_inline)).
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