[LLVMbugs] [Bug 8492] New: clang does not respect 'visibility'='default' attribute for class members

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Thu Oct 28 01:28:26 PDT 2010


           Summary: clang does not respect 'visibility'='default'
                    attribute for class members
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: slyfox at inbox.ru
                CC: llvmbugs at cs.uiuc.edu, dgregor at apple.com

Created an attachment (id=5685)
 --> (http://llvm.org/bugs/attachment.cgi?id=5685)
clang++-visibility-bug.tar.gz - the whole testcase

Let's consider the following shared c++ library:

//===--- foo.hh
struct C {
    void hidden_foo(void);
    // allowed to be used only in libfoo.so internally
    void visible_bar(void) __attribute__ ((visibility("default")));
//===--- foo.cc
#include "foo.hh"

void C::hidden_foo(void)

void C::visible_bar(void)

I try to build in with one externally visible symbol: 'C::visible_bar' so set
default visibility.

Use case is a sample program:

//===--- main cc
#include "foo.hh"

int main()
    C c;
    c.visible_bar(); // should link
    //c.hidden_foo(); // should fail to link
    return 0;

$ clang++ -O2 -fPIC -fvisibility=hidden foo.cc -shared -o libfoo.so
$ clang++ -O2 -fPIC -fvisibility=hidden main.cc -L. -lfoo -o prog

/tmp/cc-xArWX9.o: In function `main':
main.cc:(.text+0xd): undefined reference to `C::visible_bar()'
collect2: ld returned 1 exit status
clang: error: linker (via gcc) command failed with exit code 1 (use -v to see

g++ handles this fine.

I'll attach tarball with source files and script, which builds shared lib and a

Configure bugmail: http://llvm.org/bugs/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are on the CC list for the bug.

More information about the llvm-bugs mailing list