[Bug c++/66858] New: [6 Regression] FAIL: g++.dg/pch/system-2.C -O2 -g assembly comparison on aarch64-none-elf, arm-none-eabi

[ktkachov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66858

            Bug ID: 66858
           Summary: [6 Regression] FAIL: g++.dg/pch/system-2.C -O2 -g
                    assembly comparison on aarch64-none-elf, arm-none-eabi
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ktkachov at gcc dot gnu.org
                CC: jason at redhat dot com
  Target Milestone: ---
            Target: aarch64-none-elf, arm-none-eabi

Created attachment 35968
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35968&action=edit
g++.log entry for the failure

I'm seeing this failure on a bare-metal aarch64-none-elf (newlib target) after:

Author: jason <jason@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Wed Jul 1 18:27:12 2015 +0000

gcc/c-family/
     * c-opts.c (c_common_post_options): Default to C++14.
     * gcc/testsuite/ lib/target-supports.exp (cxx_default): Set to C++14.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@225272
138bc75d-0d04-0410-961f-82ee72b054a4

I'm attaching the log entry from the assembly comparison test.
Running the test with /-std=gnu++98 works fine.

I don't see this failure on linux targets (glibc based)