[Bug target/77267] New: MPX does not work in a presence of "-Wl,-as-needed" option (Ubuntu default)

[aivchenk at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77267

            Bug ID: 77267
           Summary: MPX does not work in a presence of "-Wl,-as-needed"
                    option (Ubuntu default)
           Product: gcc
           Version: 6.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: aivchenk at gmail dot com
  Target Milestone: ---

When compiling with -Wl,-as-needed libmpx.so and libmpxwrappers.so are not
linked:
>gcc -fcheck-pointer-bounds -mmpx any_mpx_test.c -Wl,-as-needed
> ldd a.out 
        linux-vdso.so.1 (0x00007ffc687a0000)
        libc.so.6 => /lib64/libc.so.6 (0x00000035c8c00000)
        /lib64/ld-linux-x86-64.so.2 (0x000055e88586f000)

And hence, MPX does not work.

(In a working scenario it should be like that:
> ldd a.out 
        linux-vdso.so.1 (0x00007fff53fe7000)
        libmpx.so.0 => /lib64/libmpx.so.0 (0x00007f135ac34000)
        libmpxwrappers.so.0 => /lib64/libmpxwrappers.so.0 (0x00007f135aa31000)
        libc.so.6 => /lib64/libc.so.6 (0x00000035c8c00000)
        libpthread.so.0 => /lib64/libpthread.so.0 (0x00000035c9400000)
        /lib64/ld-linux-x86-64.so.2 (0x0000558619680000)
)

This case is important because on Debian/Ubuntu -no-as-needed option is always
implicitly added while linking.