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C++ Visibility warning
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C++ Visibility warning


  • Subject: C++ Visibility warning
  • From: Todd Heberlein <email@hidden>
  • Date: Sun, 09 May 2010 08:17:39 -0700

In Xcode 3.2.2 I have a C++ static library and a C++ command line tool that links against it. When doing a Debug build I get a warning (see below) that a C++ map size() method has a "default" visibility in the library and a "hidden" visibility in the command line tool's .o file.

I do not get this warning when I do a Release build.

I think I remember some discussions about something like this some time ago (like the STL release and debug versions being compiled differently), but I cannot remember the details.

Is this a known issue? Should I set some compile or linking options differently in my library or application projects?

Thanks,

Todd


ld: warning: std::_Rb_tree<unsigned long long, std::pair<unsigned long long const, amf::Process*>, std::_Select1st<std::pair<unsigned long long const, amf::Process*> >, std::less<unsigned long long>, std::allocator<std::pair<unsigned long long const, amf::Process*> > >::size() const has different visibility (default) in /Users/heberlei/Development/amf/build/Debug/libAMF.a(AmfLayers.o) and (hidden) in /Users/heberlei/Development/AmfApps/build/AmfApps.build/Debug/ProcEx_batch.build/Objects-normal/x86_64/ProcEx_batch.o



The line from the command line tool that links against the library that generates the warning:

if (processLayer->all_processes.size() == 0)


The declaration from the library:

class ProcessTrackingLayer : public Layer {
public:
...
    map<UByte8,Process*> all_processes; // all processes indexed by session ID
...
};




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