Bug#1029792: sse2-support: SSE2 support not detected on VIA Eden Eshter

[ValdikSS]

Package: sse2-support
Version: 15
Severity: normal
X-Debbugs-Cc: i...@valdikss.org.ru

Dear Maintainer,

sse2-support package fails to detect SSE2 on VIA Eden Eshter CPU, which
leads to inability to install task-lxqt-desktop on WYSE C10LE machine.
The installation used to work fine on Debian 11, as far as I remember.

This seem to be a known bug of __builtin_cpu_supports() function which
was closed as WONTFIX in gcc bug tracker.

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100758

gcc developer Martin Liška proposed using cpuid bit detection method to
the author. Apparently, __builtin_cpu_supports() is unreliable.


$ cat /proc/cpuinfo | grep flags
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
cmov pat clflush acpi mmx fxsr sse sse2 tm nx cpuid pni est tm2 xtpr rng
rng_en ace ace_en ace2 ace2_en phe phe_en pmm pmm_en

$ /usr/libexec/i386-linux-gnu/isa-support/test-SSE2
$ echo $?
1

-- System Information:
Debian Release: bookworm/sid
APT prefers testing
APT policy: (500, 'testing')
Architecture: i386 (i686)

Kernel: Linux 6.1.0-1-686-pae (SMP w/1 CPU thread; PREEMPT)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8),
LANGUAGE=en_US:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages sse2-support depends on:
ii isa-support 15

sse2-support recommends no packages.

sse2-support suggests no packages.

[ValdikSS]

GCC has fixed __builtin_cpu_supports() function.

Please merge the following patch:
https://gcc.gnu.org/git/gitweb.cgi?p=gcc.git;h=454bf9f4d55058589ac6a76261356cbda599e831

[ValdikSS]

Still the issue as of Debian 12.

[ValdikSS]

gcc has been updated with the fix for this issue
gcc (4:12.3.0-1) from testing already includes it.