configure.ac (gcc_cv_ld_eh_frame_hdr): Only check GNU ld for --eh-frame-hdr.

	* configure.ac (gcc_cv_ld_eh_frame_hdr): Only check GNU ld for
	--eh-frame-hdr.
	Check for working Sun ld version.
	(HAVE_LD_EH_FRAME_HDR): Adapt comment.
	(glibc_header_dir): Set only once.
	Rename to ...
	(target_header_dir): ... this.
	Adapt users.
	(gcc_cv_target_dl_iterate_frame_hdr): Check on *-*-solaris2*.
	(TARGET_DL_ITERATE_PHDR): Define if present.
	* configure: Regenerate.
	* config.in: Likewise.
	* config/t-sol2 (LIB2ADDEH, LIB2ADDEHDEP): Define.
	* crtstuff.c (USE_PT_GNU_EH_FRAME): Define for recent Solaris 11
	with linker support and dl_iterate_phdr.
	* unwind-dw2-fde-glibc.c (USE_PT_GNU_EH_FRAME): Likewise.
	(_Unwind_IteratePhdrCallback) [PT_SUNW_UNWIND]: Also accept
	PT_SUNW_UNWIND .eh_frame_hdr sections.
	[CRT_GET_RFIB_DATA && __i386__ && __sun__ && __svr4__]: Add
	load_base to data->dbase.
	[CRT_GET_RFIB_DATA && __x86_64__ && __sun__ && __svr4__]: Handle
	64-bit Solaris 10+/x86.
	* config/sol2-gld.h [TARGET_DL_ITERATE_PHDR && HAVE_LD_EH_FRAME_HDR]
	(LINK_EH_SPEC): Define.

From-SVN: r168204