[RTEMS Project] #3438: GCC multilibs for ARM don't support FPU synonyms

RTEMS trac trac at rtems.org
Tue May 29 11:08:17 UTC 2018

#3438: GCC multilibs for ARM don't support FPU synonyms
 Reporter:  munster            |       Owner:  (none)
     Type:  defect             |      Status:  new
 Priority:  low                |   Milestone:
Component:  tool/gcc           |     Version:
 Severity:  normal             |  Resolution:
 Keywords:  multilibs,GCC,ARM  |  Blocked By:
 Blocking:                     |

Comment (by Sebastian Huber):

 Replying to [comment:3 munster]:
 > Replying to [comment:1 Sebastian Huber]:
 > > The -mfpu=neon-fp16 is not supported by RTEMS as far as I know. If you
 want to add support for it, then please add a new multilib for this.
 > I did that, please see the attached file.

 The patch is too extensive from my point of view. Please send patches to
 devel at rtems.org.

 > >
 > > What do you mean with "different but compatible FPU options"?
 > For example, `-mfpu=neon` and `-mfpu=neon-vfpv3` are the same. Also
 `-march=armv7-a` and `-mcpu=cortex-a9` are very similar if not the same.

 I don't know the details of the cost models used by default on ARMv7-A and
 for Cortex-A9.

Ticket URL: <http://devel.rtems.org/ticket/3438#comment:4>
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