[Bug target/64953] Compiling sourcecode for STM32F103 causes USB errors with some optimization settings

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64953

--- Comment #10 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
(In reply to manuel.reimer from comment #9)
> The two commits are in different branches. How to bisect in this case?

gcc's history is linear in git. So you could start with a 
bad commit on 20140302 and go back a year and use e.g. a commit on 
20130302 as good.

(Or you could wait until an ARM guy takes a look at this bug...)