[Bug target/46770] Replace .ctors/.dtors with .init_array/.fini_array on targets supporting them

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46770

--- Comment #25 from H.J. Lu <hjl.tools at gmail dot com> 2010-12-11 20:04:23 UTC ---
(In reply to comment #24)

> > I have said "If you have constructor priorities in .o files and .c
> > files, you may get different behaviors if .o files are compiled with
> > a different compiler, different versions of GCC or not GCC at all."
> 
> Well, it sounds to me, then, that we would be introducing a binary
> compatibility problem to make this change.  If we're going to do it, I

Shared libraries are OK. Only static ones may have this issue.

> think that means adding linker smarts that detect that there are both
> .ctor.* and .init_array.* sections and issuing an error -- not a warning

I will work on a linker patch.

> -- together with a hint as to how to recompile so as to get either the
> new or old behavior.  (Some people will have binary libraries they can't
> recompile, so we need to explain how to compile new code so that it
> still uses .ctor.*.)

We need a gcc option to select .ctor or .init_array.