Initial x32 support.

Initial x32 support.

2011-07-07  H.J. Lu  <hongjiu.lu@intel.com>

	* config.gcc: Support --with-multilib-list for x86 Linux
	targets.

	* configure.ac: Mention x86-64 for --with-multilib-list.
	* configure: Regenerated.

	* config/i386/gnu-user64.h (SPEC_64): Support x32.
	(SPEC_32): Likewise.
	(ASM_SPEC): Likewise.
	(LINK_SPEC): Likewise.
	(TARGET_THREAD_SSP_OFFSET): Likewise.
	(TARGET_THREAD_SPLIT_STACK_OFFSET): Likewise.
	(SPEC_X32): New.

	* config/i386/i386.h (TARGET_X32): New.
	(TARGET_LP64): New.
	(LONG_TYPE_SIZE): Likewise.
	(POINTER_SIZE): Likewise.
	(POINTERS_EXTEND_UNSIGNED): Likewise.
	(OPT_ARCH64): Support x32.
	(OPT_ARCH32): Likewise.

	* config/i386/i386.opt (mx32): New.

	* config/i386/kfreebsd-gnu64.h (GNU_USER_LINK_EMULATIONX32): New.
	(GLIBC_DYNAMIC_LINKERX32): Likewise.
	* config/i386/linux64.h (GNU_USER_LINK_EMULATIONX32): Likewise.
	(GLIBC_DYNAMIC_LINKERX32): Likewise.

	* config/linux.h (UCLIBC_DYNAMIC_LINKERX32): New.
	(BIONIC_DYNAMIC_LINKERX32): Likewise.
	(GNU_USER_DYNAMIC_LINKERX32): Likewise.

	* config/i386/t-linux64: Support TM_MULTILIB_CONFIG.

	* doc/install.texi: Document --with-multilib-list for
	Linux/x86-64.

	* doc/invoke.texi: Document -mx32.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@175984 138bc75d-0d04-0410-961f-82ee72b054a4