[Bug testsuite/69366] New: All MPX tests are unsupported

["hjl.tools at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69366

            Bug ID: 69366
           Summary: All MPX tests are unsupported
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: testsuite
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hjl.tools at gmail dot com
                CC: ienkovich at gcc dot gnu.org
  Target Milestone: ---

check_effective_target_mpx checks if "-fcheck-pointer-bounds -mmpx" can
link.  Since the target directory isn't added to link, I got

spawn -ignore SIGHUP /export/build/gnu/gcc/build-x86_64-linux/gcc/xgcc
-B/export/build/gnu/gcc/build-x86_64-linux/gcc/ mpx25592.c
-fno-diagnostics-show-caret -fdiagnostics-color=never -fcheck-pointer-bounds
-mmpx -lm -o mpx25592.exe^M
/usr/local/bin/ld: cannot find -lmpx^M
/usr/local/bin/ld: cannot find -lmpxwrappers^M
collect2: error: ld returned 1 exit status^M
compiler exited with status 1
output is:
/usr/local/bin/ld: cannot find -lmpx^M
/usr/local/bin/ld: cannot find -lmpxwrappers^M
collect2: error: ld returned 1 exit status^M

UNSUPPORTED: gcc.target/i386/pr64805.c