How exactly does __attribute__((constructor)) work?

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  1. It runs when a shared library is loaded, typically during program startup.
  2. That’s how all GCC attributes are; presumably to distinguish them from function calls.
  3. GCC-specific syntax.
  4. Yes, this works in C and C++.
  5. No, the function does not need to be static.
  6. The destructor runs when the shared library is unloaded, typically at program exit.

So, the way the constructors and destructors work is that the shared object file contains special sections (.ctors and .dtors on ELF) which contain references to the functions marked with the constructor and destructor attributes, respectively. When the library is loaded/unloaded the dynamic loader program (ld.so or somesuch) checks whether such sections exist, and if so, calls the functions referenced therein.

Come to think of it, there is probably some similar magic in the normal static linker so that the same code is run on startup/shutdown regardless if the user chooses static or dynamic linking.

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