[Bug bootstrap/90781] ubsan bootstrap with -O3 -march=native fails at compare stage

[dcb314 at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90781

David Binderman <dcb314 at hotmail dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |uros at gcc dot gnu.org

--- Comment #3 from David Binderman <dcb314 at hotmail dot com> ---
(In reply to Martin Liška from comment #2)
> Can't reproduce that on:
> model name	: Intel(R) Xeon(R) CPU E7-8891 v4 @ 2.80GHz

I find it not too much of a surprise that an AMD specific bug
isn't present on Intel, but thanks for checking. 

> Can you please paste which files are different? And what's the difference in
> the affected files?

Comparing stages 2 and 3
warning: gcc/cc1plus-checksum.o differs
Bootstrap comparison failure!
fixincludes/fixincl.o differs
fixincludes/fixfixes.o differs
...

$ ls -l `find . -name cc1plus-checksum.o -print`
-rw-rw-r--. 1 dcb dcb 39424 Jun 10 16:38 ./gcc/cc1plus-checksum.o
-rw-rw-r--. 1 dcb dcb 39424 Jun 10 09:51 ./prev-gcc/cc1plus-checksum.o
-rw-rw-r--. 1 dcb dcb 33360 Jun 10 07:01 ./stage1-gcc/cc1plus-checksum.o
$ ls -l `find . -name fixincl.o -print`
-rw-rw-r--. 1 dcb dcb 451688 Jun 10 06:55
./build-x86_64-pc-linux-gnu/fixincludes/fixincl.o
-rw-rw-r--. 1 dcb dcb 973064 Jun 10 12:30 ./fixincludes/fixincl.o
-rw-rw-r--. 1 dcb dcb 973064 Jun 10 07:28 ./prev-fixincludes/fixincl.o
-rw-rw-r--. 1 dcb dcb 403680 Jun 10 06:55 ./stage1-fixincludes/fixincl.o
$ ls -l `find . -name fixfixes.o -print`
-rw-rw-r--. 1 dcb dcb  68800 Jun 10 06:55
./build-x86_64-pc-linux-gnu/fixincludes/fixfixes.o
-rw-rw-r--. 1 dcb dcb 118088 Jun 10 12:30 ./fixincludes/fixfixes.o
-rw-rw-r--. 1 dcb dcb 118088 Jun 10 07:28 ./prev-fixincludes/fixfixes.o
-rw-rw-r--. 1 dcb dcb  28704 Jun 10 06:55 ./stage1-fixincludes/fixfixes.o
$ 

Maybe someone with an AMD box would be in a stronger position
to confirm or deny what I am seeing locally.