[Bug 223752] clang __attribute__((constructor)) gets wrong input parameters

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223752

--- Comment #21 from David Chisnall <theraven at FreeBSD.org> ---
It's also worth noting that functions declared with this attribute can have
some complex interaction with threading.  If a process spawns a thread which
calls `dlopen` then all of the library's constructors will be called in that
thread.  At this point, it's not clear whether the run-time linker will even
have access to the arguments that you want.  It's also not clear what `envp`
should be (the current environment, or the environment from process creation
time?)

I believe glibc provides an `__arguments` variable, along the same lines as
`__environ`, which allows the process to get access to the arguments from
arbitrary points in the code.  Implementing something like this would probably
be the best solution for this use case.

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