mingw hosted arm-elf output differs from linux hosted arm-elf when compiling with -Os
Ian Lance Taylor
Fri Apr 3 14:23:00 GMT 2009
"Andreas Karlsson" <email@example.com> writes:
>>This is most likely a bug. Unfortunately, this type of bug can be
>>somewhat painful to pin down. There are a number of possible causes.
>>One possible cause is the problem identified in
> I've tried the solution mentioned above and it makes no difference, any
> other suggestion or should we accept the fact and call it an (un)harmful
> feature? Personal I would prefer to get it byte for byte identical.
It's a bug, not a feature. I don't have any further suggestions other
than debugging. The first debugging step would be to produce all the
dump files and compare them to see where the first difference occurs
(use -fdump-unnumbered to remove irrelevant addresses). That should let
you identify which pass causes the difference. Unfortunately after that
it is just a matter of debugging to find out why the difference occurs.
I would encourage you to file a bug report with precise and complete
steps for how to recreate the problem. See http://gcc.gnu.org/bugs.html
> Btw, the solution wasn't implemented in the gcc-4.2.2 and the ChangeLog
> didn't mention why or why not.
The bug was identified after gcc 4.2.1 was released, and was not
considered serious enough to be fixed on a release branch. After doing
a release bug fixes on the release branch are restricted to regressions
from past releases or generation of invalid code.
More information about the Gcc-help