[llvm-bugs] [Bug 33796] New: availability attributes override visibility

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=33796

            Bug ID: 33796
           Summary: availability attributes override visibility
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: nicolasweber at gmx.de
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org

We're moving Chrome to @available, which requires tagging some of our code with
API_AVAILABLE(10.10). However, that seems to also make classes visible, which
we don't want:

$ cat test.cc
#define F
class F Foo {
  void f();
};

void Foo::f() {}
$ bin/clang -c test.cc -mmacosx-version-min=10.10 -fvisibility=hidden
-fvisibility-inlines-hidden && ld -dylib -o libtest.dylib test.o && nm
libtest.dylib 
ld: warning: -macosx_version_min not specified, assuming 10.10
0000000000000fb0 t __ZN3Foo1fEv

$ cat test.cc
#define F __attribute__((availability(macos, introduced=10.11))) 
class F Foo {
  void f();
};

void Foo::f() {}
$ bin/clang -c test.cc -mmacosx-version-min=10.10 -fvisibility=hidden
-fvisibility-inlines-hidden && ld -dylib -o libtest.dylib test.o && nm
libtest.dylib 
ld: warning: -macosx_version_min not specified, assuming 10.10
0000000000000fb0 T __ZN3Foo1fEv



That's hopefully just a bug, and not by design?

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