[Bug target/58523] New: ARM and AArch64: -fsection-anchors doesn't seem to work

["b.grayson at samsung dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58523

            Bug ID: 58523
           Summary: ARM and AArch64:  -fsection-anchors doesn't seem to
                    work
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: b.grayson at samsung dot com
            Target: arm, aarch64
             Build: gcc-4.9-20130915-arm-linux-gnueabhihf,
                    gcc-aarch64-4.9-20130602/aarch64-linux-gnu-gcc

Created attachment 30890
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30890&action=edit
Test C file with two global variables, and a use of both of them

I've tried compiling with -fsection-anchors in several different releases of
gcc for ARM and now for aarch64, and it seems the optimization is not kicking
in for scenarios where it should.  I looked through the gcc/config directories,
and the support seems to be there.  Here is a simple testcase.  The resulting
assembly (not posted here, according to bug-reporting guidelines) does a full
address-generation for variable a, and then again for variable b.