[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 #7 from dstaesse <dimitri.staessens at ugent.be> ---
(In reply to Mark Millard from comment #5)

Good point, we only tried amd64 and i386. 

This feature seems to be very sparsely documented, with some sources saying
everything but void func(void) is undefined behaviour and others stating that
it can have the same signature as the main() function. The GNU compiler
documentation doesn't give details and clang doesn't document it at all. I've
seen other projects use this, though.

The compiler doesn't seem to check the function signature at all, I've tried to
set the constructor attribute to functions with all sorts of parameters and
complaints.

If this is undefined behaviour, do you know of a portable way to access argv
from a shared library without passing it as a function parameter to some init
call?

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