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Which means that constructors are invoked in the order the shared libraries are loaded in, and if shared libraries have dependencies, they are first loaded "down the tree". But that sucks hard, because libraries tend to have interdependencies, non obvious ones at that, and cyclic ones too! And that means you might end up calling functions from libs whose constructors haven't run yet, or whose destructors already ran.

Then, various libraries (including systemd's) use "-z nodelete", …