[Bug target/70210] -march=native and -mcpu=native do not detect ARM cortex-a53 in 32 bit mode on Linux

[ktkachov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70210

--- Comment #6 from ktkachov at gcc dot gnu.org ---
(In reply to Viktor Engelmann from comment #5)
> Hmmm the problem isn't related to docker - I get the same problem when I run
> gcc on the raspberry directly with -mcpu=armv7l as autoconf does in docker.
> 

yep, armv7l is not a valid argument to -mcpu by design.

> When I run gcc manually with -mcpu=cortex-a53, everything is fine.
> lscpu says
> 
> Architecture:        armv7l
> Byte Order:          Little Endian
> CPU(s):              4
> On-line CPU(s) list: 0-3
> Thread(s) per core:  1
> Core(s) per socket:  4
> Socket(s):           1
> Vendor ID:           ARM
> Model:               4
> Model name:          Cortex-A53
> Stepping:            r0p4
> CPU max MHz:         1200.0000
> CPU min MHz:         600.0000
> BogoMIPS:            38.40
> Flags:               half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva
> idivt vfpd32 lpae evtstrm crc32
> 
> and /proc/cpuinfo is basically the same as the one Andrew Roberts had posted.
> Maybe it's a problem in autoconf for passing armv7l (the "Architecture:"
> line) to -mcpu.