re PR target/38736 (-mavx can change the ABI via BIGGEST_ALIGNMENT)

gcc/

2009-01-18  H.J. Lu  <hongjiu.lu@intel.com>

	PR target/38736
	* c-common.c (handle_aligned_attribute): Use
	ATTRIBUTE_ALIGNED_VALUE instead of BIGGEST_ALIGNMENT for
	default alignment value.

	* c-cppbuiltin.c (c_cpp_builtins): Define __BIGGEST_ALIGNMENT__.

	* defaults.h (ATTRIBUTE_ALIGNED_VALUE): New.
	* config/i386/i386.h (ATTRIBUTE_ALIGNED_VALUE): Likewise.

	* doc/extend.texi: Update __attribute__ ((aligned)).  Document
	__BIGGEST_ALIGNMENT__.

	* doc/tm.texi: Document ATTRIBUTE_ALIGNED_VALUE.

gcc/testsuite/

2009-01-18  H.J. Lu  <hongjiu.lu@intel.com>

	PR target/38736
	* g++.dg/compat/abi/pr38736_main.C: New.
	* g++.dg/compat/abi/pr38736_x.C: Likewise.
	* g++.dg/compat/abi/pr38736_y.C: Likewise.
	* g++.dg/other/macro-1.C: Likewise.
	* gcc.dg/macro-1.c: Likewise.
	* gcc.dg/compat/pr38736_main.c: Likewise.
	* gcc.dg/compat/pr38736_x.c: Likewise.
	* gcc.dg/compat/pr38736_y.c: Likewise.

From-SVN: r143486