[Bug c/102472] New: Infinite loop on m68k

[giulio.benetti at benettiengineering dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102472

            Bug ID: 102472
           Summary: Infinite loop on m68k
           Product: gcc
           Version: 11.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: giulio.benetti at benettiengineering dot com
  Target Milestone: ---

When building python-uvloop package on Buildroot for m68k gcc enters an
infinite loop on:
'''
/home/giuliobenetti/autobuild/run/instance-3/output-1/host/bin/m68k-linux-gcc
-Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall
-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -g2
-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -g2
-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -fPIC
-I/home/giuliobenetti/autobuild/run/instance-3/output-1/host/m68k-buildroot-linux-uclibc/sysroot/usr/include/python3.9
-c uvloop/loop.c -o build/temp.linux-x86_64-3.9/uvloop/loop.o -O2
'''

To reproduce it:

# git clone git://git.busybox.net/buildroot
# wget https://git.busybox.net/buildroot-test/tree/utils/br-reproduce-build

- modify BASE_GIT=... with your buildroot path in br-reproduce-build then:
# chmod a+x br-reproduce-build
# ./br-reproduce-build 17d6e6422abadcd6313c430c40f2a5d7162dbbd3

The only way I've found to build correctly is to turn off optimization
overriding CFLAGS with -O0.

In this case that we have an infinite loop, I don't know how provide .i and .s
files. Can you please point me some instruction for this case?

Thanks in advance