2015-09-09  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/53184
	* doc/invoke.texi ([Wsubobject-linkage]): Document.

/c-family
2015-09-09  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/53184
	* c.opt ([Wsubobject-linkage]): Add.

/cp
2015-09-09  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/53184
	* decl2.c (constrain_class_visibility): Use Wsubobject-linkage.

/testsuite
2015-09-09  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/53184
	* g++.dg/warn/Wsubobject-linkage-1.C: New.
	* g++.dg/warn/Wsubobject-linkage-2.C: Likewise.
	* g++.dg/warn/Wsubobject-linkage-3.C: Likewise.
	* g++.dg/warn/Wsubobject-linkage-4.C: Likewise.

From-SVN: r227593