[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 #41 from H.J. Lu <hjl.tools at gmail dot com> 2010-12-12 00:19:54 UTC ---
(In reply to comment #40)
> On 12/11/2010 4:08 PM, hjl.tools at gmail dot com wrote:
> 
> > We only support constructor priority in single source file:
> 
> H.J., this is false.
> 
> Please try writing three constructors, with priorities 1, 2, and 3.  Put
> the constructors with priorities 1 and 3 in one file and 2 in another
> file.  See what happens the program runs.
> 

That doesn't mean anything.  My testcase shows that a constructor
with priority 65535 may run after another constructor with priority
1007 in another file. We say explicitly

---
     Note that the particular values of PRIORITY do not matter; only
     their relative ordering.
---

That means we only guarantee constructor priorities in one TU and
my testcase confirms it.