[Bug bootstrap/88714] New: [9 regression] bootstrap comparison failure on armv7l since r265398

[mikpelinux at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88714

            Bug ID: 88714
           Summary: [9 regression] bootstrap comparison failure on armv7l
                    since r265398
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mikpelinux at gmail dot com
  Target Milestone: ---

Attempting to bootstrap gcc-9.0 on armv7l fails for me with bootstrap
comparison failures on a large number of files:

rm -f stage_current
make[3]: Leaving directory '/mnt/scratch/objdir9'
Comparing stages 2 and 3
Bootstrap comparison failure!
armv7l-unknown-linux-gnueabi/libgomp/proc.o differs
armv7l-unknown-linux-gnueabi/libgomp/affinity.o differs
armv7l-unknown-linux-gnueabi/libgomp/oacc-parallel.o differs
armv7l-unknown-linux-gnueabi/libgomp/task.o differs
armv7l-unknown-linux-gnueabi/libgomp/env.o differs
armv7l-unknown-linux-gnueabi/libgomp/splay-tree.o differs
armv7l-unknown-linux-gnueabi/libgomp/.libs/proc.o differs
armv7l-unknown-linux-gnueabi/libgomp/.libs/affinity.o differs
armv7l-unknown-linux-gnueabi/libgomp/.libs/oacc-parallel.o differs
armv7l-unknown-linux-gnueabi/libgomp/.libs/task.o differs
armv7l-unknown-linux-gnueabi/libgomp/.libs/env.o differs
armv7l-unknown-linux-gnueabi/libgomp/.libs/splay-tree.o differs
armv7l-unknown-linux-gnueabi/libgomp/.libs/oacc-mem.o differs
armv7l-unknown-linux-gnueabi/libgomp/.libs/target.o differs
armv7l-unknown-linux-gnueabi/libgomp/.libs/priority_queue.o differs

.. about 600 more lines of the same

zlib/libz_a-uncompr.o differs
zlib/libz_a-crc32.o differs
zlib/libz_a-inftrees.o differs
zlib/libz_a-gzlib.o differs
zlib/libz_a-trees.o differs
Makefile:22315: recipe for target 'compare' failed
make[2]: *** [compare] Error 1
make[2]: Leaving directory '/mnt/scratch/objdir9'
Makefile:22294: recipe for target 'stage3-bubble' failed
make[1]: *** [stage3-bubble] Error 2
make[1]: Leaving directory '/mnt/scratch/objdir9'
Makefile:22357: recipe for target 'bootstrap' failed
make: *** [bootstrap] Error 2

Started with r265398 and still happens at r267600.  I don't see this issue on
other targets, or when bootstrapping gcc-8.

Configured as:
/mnt/scratch/gcc-9-r267600/configure --prefix=/mnt/scratch/install9
--enable-bootstrap --enable-shared --enable-threads=posix
--enable-checking=release --enable-__cxa_atexit --disable-libunwind-exceptions
--enable-gnu-unique-object --enable-linker-build-id
--with-linker-hash-style=gnu --enable-languages=c,c++ --enable-initfini-array
--disable-lto --disable-plugin --disable-libmudflap --without-isl
--without-cloog --disable-sjlj-exceptions --with-arch=armv7-a
--with-tune=cortex-a9 --with-float=hard --with-fpu=vfpv3-d16
--build=armv7l-unknown-linux-gnueabi
--with-gmp=/home/mikpe/pkgs/linux-armv7l/gmp-6.1.2
--with-mpfr=/home/mikpe/pkgs/linux-armv7l/mpfr-4.0.1
--with-mpc=/home/mikpe/pkgs/linux-armv7l/mpc-1.1.0