[RTEMS Project] #2967: ARM: Change ABI to not use short enums

RTEMS trac trac at rtems.org
Mon Apr 3 06:07:23 UTC 2017

#2967: ARM: Change ABI to not use short enums
 Reporter:  Sebastian Huber  |      Owner:  joel.sherrill@…
     Type:  enhancement      |     Status:  new
 Priority:  normal           |  Milestone:  4.12.0
Component:  GCC              |    Version:
 Severity:  normal           |   Keywords:
 Whether enums are short or not is left open in the ARM EABI. On Linux and
 FreeBSD no short enums are used.  Otherwise short enums are enabled by

 Short enums may cause hard to find issues with 3rd party software, since
 the are quite unusual in general, e.g.


 The data and structure layout may suddenly change in case enumeration
 values are added/removed.  The benefit of short enums is probably not
 worth the trouble, since the packed compiler attribute can be used to
 individually make an enum short.

 The reason for not choosing no short enums during the ARM EABI
 introduction was an issue with Newlib.  This is addressed with the
 following patch:


Ticket URL: <http://devel.rtems.org/ticket/2967>
RTEMS Project <http://www.rtems.org/>
RTEMS Project

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