bug#44422: closed (AC_CANONICAL_HOST sets wrong $host_cpu on Raspberry Pi 3)

[GNU bug Tracking System]

Your message dated Mon, 16 Nov 2020 19:23:48 -0700
with message-id <202011170223.0AH2Nmme012570@freefriends.org>
and subject line 
has caused the debbugs.gnu.org bug report #44422,
regarding AC_CANONICAL_HOST sets wrong $host_cpu on Raspberry Pi 3
to be marked as done.

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-- 
44422: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=44422
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> --- Begin Message ---
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> Subject: 
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> AC_CANONICAL_HOST sets wrong $host_cpu on Raspberry Pi 3
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> Date: 
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> Tue, 3 Nov 2020 17:16:42 +0100
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> User-agent: 
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> Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.12.1
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> I'm trying to port a project to docker and I'm also testing it on my
> Raspberry Pi 3B+
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> when I *./configure* and *make* the project, it fails with this message
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> gcc: error: unrecognized -mcpu target: armv7l
> gcc: note: valid arguments are: arm8 arm810 strongarm [...] cortex-a53 [...]
> gcc: error: missing argument to '-march='
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> lscpu says this:
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> 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 idi
>                      vt vfpd32 lpae evtstrm crc32
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> So it seems to me that AC_CANONICAL_HOST sets $host_cpu to armv7l,
> although that is the Architecture and should be passed to -march
> instead. -mcpu should get the Model name.
>
> I couldn't get it to accept the --host=cpu-os-abi parameter, because
> cortex-a35 contains a dash and that seems to confuse autoconf (that
> produces the error message Invalid configuration
> `cortex-a53-unknown-linux-gnueabihf': machine `cortex-a53-unknown' not
> recognized). I did manage to compile with
> --host=native-unknown-linux-gnueabihf, but I'd rather not define a fixed
> ABI, because that would break the cross-platform compatibility of the
> Dockerfile.
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> I'm using autoconf 2.69 from the docker base image "ubuntu:latest".
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> Date: 
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> Mon, 16 Nov 2020 19:23:48 -0700
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