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

[manuel.reimer at gmx dot de]

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

--- Comment #12 from manuel.reimer at gmx dot de ---
(In reply to Richard Earnshaw from comment #11)
> We don't have your hardware and we don't have the full code to your
> application, so we aren't going to be able to help you debug this.

The hardware is basically something like a "reference application" for the
STM32F103 available for a few bucks on ebay:
http://www.ebay.com/itm/400608858461

The software is just the bootloader, I will need to flash new software directly
via USB: https://github.com/tormodvolden/maple-bootloader/tree/unify_platforms

> To take this any further you'll need to show us why you think the compiler
> has mis-optimized your code.

I won't be able to.

I'm just a hobby programmer trying to help with this project:
https://github.com/j1rie/IRMP_STM32/ with the goal to create a cheap USB based
infrared remote control receiver.

I'm able to compile the code, flash the binary and up to now I was able to
provide the required information in this bug report. I don't understand in
detail what the C code does and I don't know anything about how compilers and
their optimization work.