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

RTEMS trac trac at rtems.org
Tue May 29 11:29:16 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 munster):

 Replying to [comment:2 Sebastian Huber]:
 > I think we just have to teach GCC (in t-rtems) that it should use the
 > thumb/armv7-a/neon/hard;@mthumb at march=armv7-a at mfpu=neon at mfloat-abi=hard
 > multilib if your application uses -mfpu=neon-fp16.
 I think it's not enough. Some people would like to use ARM (not Thumb
 mode), some people may need `-mfloat-abi=softfp`, and suddenly you're
 looking at **12** multilibs only for ARMv7-A.
 Please also look at gcc-7.3.0/gcc/config/arm/t-rmprofile - it contains 20

 To combat that rapid expansion, I suggest to create a GCC's configure
 option `--with_multilib_list=<cpu1>,...` and add sub-sections into t-rtems
 for each individual cpu. This way anybody could choose necessary platform
 without having to patch t-rtems.

Ticket URL: <http://devel.rtems.org/ticket/3438#comment:5>
RTEMS Project <http://www.rtems.org/>
RTEMS Project

More information about the bugs mailing list