[Bug target/82175] [8 Regression] -march=native fails on armv7 big/little system armv7l-unknown-linux-gnueabihf with gcc 8.0.0

["rearnsha at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82175

--- Comment #7 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
(In reply to Andrew Roberts from comment #6)
> Thanks Richard, this is now ok, tested on armv7 and aarch64. 
> 
> However I do see differences in what is selected by march=native on arm
> between 7.2.0 and 8.0.0.20171001. Is this as expected? Or is it a work in
> progress? There seem to be significant changes...
> 
> On aarch64: The only difference is: (< is gcc-7.2.0, > is gcc-8)
> 
> <   -mtls-size=                                 [default]
> ---
> >   -mtls-size=                                 24
> 

This issue has nothing to do with AArch64.  that must be something else.

> On armv7: (tested on RPI, and ODROID XU4)
> RPI:
> <   -march=                     		armv8-a+crc
> ---
> >   -march=                     		armv8-a+crc+simd (RPI)

To be expected.  The compiler now includes the FP and SIMD capabilities in the
architecture string (instead of in -mfpu).

> 
> ODROID XU4:
> <   -march=                                     armv7ve
> ---
> >   -march=                                     armv7ve+vfpv3-d16

Likewise.

> 
> Differences ommon to both RPI and ODROID XU4:
> >   -mbe32                      		[enabled]
> >   -mbe8                       		[disabled]
> 
> <   -mcpu=                      		[default]
> <   -mfix-cortex-m3-ldrd        		[enabled]
> ---
> >   -mcpu=                      		
> >   -mfix-cortex-m3-ldrd        		[disabled]
> 
> <   -mrestrict-it               		[enabled]
> ---
> >   -mrestrict-it               		[disabled]
[...]

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