re PR driver/65444 (-z bndplt isn't passed to linker for -mmpx when building dynamic...

re PR driver/65444 (-z bndplt isn't passed to linker for -mmpx when building dynamic objects)

gcc/
	PR driver/65444
	* config/i386/linux-common.h (MPX_SPEC): New.
	(CHKP_SPEC): Add MPX_SPEC.
	* doc/invoke.texi (-fcheck-pointer-boudns): Document
	possible issues with '-z bndplt' support in linker.

libmpx/

	PR driver/65444
	* configure.ac: Add check for '-z bndplt' support
	by linker. Add link_mpx output variable.
	* libmpx.spec.in (link_mpx): New.
	* configure: Regenerate.

From-SVN: r221831