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[PATCH C++] document order of C++ ctors and attribute constructor is unspecified

In bug 52477 - Wrong initialization order?  attribute constructor
vs static data access, the reporter expects C++ objects with static
storage duration to have their ctors called in the same order as
those of functions declared with attribute constructor interleaved
with them.

In his comment on the bug Richard opines that relying on the order
is undefined.  The attached patch updates the manual to make this

Jason, can you please review it for 7.0?

PR c++/52477 - Wrong initialization order? __attribute__((constructor)) vs static data access


	PR c++/52477
	* doc/extend.texi (attribute constructor): Mention order of C++ ctors.

diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi
index 143a7b7..159f1be 100644
--- a/gcc/doc/extend.texi
+++ b/gcc/doc/extend.texi
@@ -2510,7 +2510,11 @@ if you have a constructor that allocates a resource and a destructor
 that deallocates the same resource, both functions typically have the
 same priority.  The priorities for constructor and destructor
 functions are the same as those specified for namespace-scope C++
-objects (@pxref{C++ Attributes}).
+objects (@pxref{C++ Attributes}).  However, the order in which
+constructors for C++ objects with static storage duration and functions
+decorated with attribute @code{constructor} are invoked is unspecified.
+In mixed declarations, attribute @code{init_priority} can be used to
+impose a specific ordering.
 @item deprecated
 @itemx deprecated (@var{msg})

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