Exceptions in ARM

[Johannes Pfau]

On Saturday, 1 March 2014 at 11:46:03 UTC, Timo Sintonen wrote:
>
> I checked my code and the library code and there is no other 
> call like this. I think there is one thing that makes this 
> function special: if I understand correct, this function will 
> not return. If there is some noreturn attribute somewhere this 
> function might be handled in a different way.
>
> Is it so that gdc does not generate any assembly directly? So 
> this would be a bug in gcc side and I may report it there.

It's not marked as noreturn though, neither in C nor in the D 
code.
The function can return if there is some kind of error 
(http://refspecs.linuxfoundation.org/LSB_3.1.0/LSB-Core-S390/LSB-Core-S390/baselib--unwind-raiseexception.html)

Some google-fu shows that someone reported this bug here:

http://gcc.gnu.org/ml/gcc-help/2013-06/msg00091.html
https://sourceware.org/bugzilla/show_bug.cgi?id=15628


However, someone also had this problem on this german site:
http://www.mikrocontroller.net/topic/312956

and the solution was that -mcpu alone was not good enough, he had 
to specify -march flags as well so please double-check your flags.
It's possible that binutils doesn't work properly with -mcpu so 
I'd do this:

-march=armv7e-m -mcpu=cortex-m4 -mthumb -mtune=cortex-m4

Or better at configure time:

--with-arch=armv7e-m --with-cpu=cortex-m4 --with-mode=thumb 
--with-tune=cortex-m4


Oh, and if that works: Please add a comment tu the bintuils issue 
that specifying -march helps.