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

[RTEMS trac]

#3438: GCC multilibs for ARM don't support FPU synonyms
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 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:                     |
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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
 multilibs.

 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.

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