* configure.ac (gnu_indirect_function): New test.

	* configure.ac (gnu_indirect_function): New test.
	* configure: Rebuilt.
	* config.in (HAVE_GAS_INDIRECT_FUNCTION): New.
	* defaults.h (IFUNC_ASM_TYPE): Provide default.

	* doc/extend.texi (Function Attributes): Document ifunc.
	* varasm.c (do_assemble_alias): Deal with ifuncs too.

	c-family/
	* c-common.c (handle_alias_ifunc_attribute): New, broken out of	...
	(handle_alias_attribute): ... here.
	(handle_ifunc_attribute): New.

	testsuite/
	* lib/target-supports-dg.exp (dg-require-ifunc): New.
	* lib/target-supports.exp (check_ifunc_available): New.
	* gcc.dg/attr-ifunc-1.c: New.
	* gcc.dg/attr-ifunc-2.c: New.
	* gcc.dg/attr-ifunc-3.c: New.
	* gcc.dg/attr-ifunc-4.c: New.
	* gcc.dg/attr-ifunc-5.c: New.
	* testsuite/g++.dg/ext/attr-ifunc-1.C
	* testsuite/g++.dg/ext/attr-ifunc-2.C
	* testsuite/g++.dg/ext/attr-ifunc-3.C
	* testsuite/g++.dg/ext/attr-ifunc-4.C

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@164110 138bc75d-0d04-0410-961f-82ee72b054a4