Dear readers,

I encountered a problem in my project when using Boost.Exception with the predefined types errinfo_xyz in a library project. I have two classes ClassA and ClassB in my library which both throw a boost::exception with errinfo_api_function type in their implementation file (.cpp) These both classes are compiled into a static library with the C/C++-Flags -fvisibility=hidden.

Then I have a main.cpp which creates an instance of ClassA and ClassB and links to the library which contains ClassA.o and ClassB.o. When I compile the main.cpp I get the linker error duplicate symbol for the errinfo_api_function object in ClassA.o and ClassB.o. If I remove the visibility=hidden flag, it links without problems. I am not an expert on the compiler flags, but I saw that many libraries use the visibility=hidden flag so I think it would be good, if my lib could also use it.