参考链接：
《Proper C++ Visibility Support》
《Controlling Symbol Visibility》
《Why symbol visibility is good》
《Introduction to symbol visibility》
《Control over symbol exports in GCC》
《Sorry state of dynamic libraries on Linux》
《Simple C++ Symbol Visibility Demo》
《Hiding what's exposed in a shared library》
《Limit Performance Impact of Global Symbols on Linux》
《ELF symbol visibility and the perils of name?clashing》
《Symbol binding types in ELF and their effect on linking of relocatable?files》
《Control over symbol exports in GCC》
《ELF?symbol visibility and the perils of name?clashing》
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