[Bug target/117771] New: [9 Regression] RISC-V: stage1 fails to build using gcc-9.5 since r15-5603-gb3f1b9e2aa0

[ewlu at rivosinc dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117771

            Bug ID: 117771
           Summary: [9 Regression] RISC-V: stage1 fails to build using
                    gcc-9.5 since r15-5603-gb3f1b9e2aa0
           Product: gcc
           Version: 9.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ewlu at rivosinc dot com
  Target Milestone: ---

Our postcommit has been failing over the weekend due to failing to build gcc
stage 1. https://github.com/patrick-rivos/gcc-postcommit-ci/issues/2136

Bisected down to r15-5603-gb3f1b9e2aa0

full build logs can be found here:
https://gist.github.com/ewlu/db769a41c2308a85f73e6b52011818cf/raw/2652_41114-build_Remove_INCLUDEMEMORY_PR117737-1_101774-linux-rv64gcv-lp64d-multilib-build-log.log

Building gcc version:
ewlu@rise-gcc-ci-1:~$ gcc --version
gcc (Ubuntu 9.4.0-1ubuntu1~20.04.2) 9.4.0
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

ewlu@rise-gcc-ci-1:~$ as -v
GNU assembler version 2.34 (aarch64-linux-gnu) using BFD version (GNU Binutils
for Ubuntu) 2.34