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

[Viktor.Engelmann at googlemail dot com]

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

--- Comment #5 from Viktor Engelmann <Viktor.Engelmann at googlemail dot com> ---
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.

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.