[Bug 2095325] Re: libunwind: FTBFS on arm64 and i386 plus test failures

[Jeremy Bícha]

libunwind 1.8.1 still fails to build on Ubuntu's arm64 but not Debian's.

https://launchpad.net/ubuntu/+source/libunwind/1.8.1-0.1

libtool: link: gcc -fno-optimize-sibling-calls -g -O2 -Werror=implicit-function-declaration -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -ffile-prefix-map=/<<PKGBUILDDIR>>=. -flto=auto -ffat-lto-objects -specs=/usr/share/dpkg/no-pie-compile.specs -Wformat -Werror=format-security -fno-stack-protector -fno-stack-clash-protection -mbranch-protection=none -fdebug-prefix-map=/<<PKGBUILDDIR>>=/usr/src/libunwind-1.8.1-0.1 -fexceptions -Wall -Wsign-compare -D__EXTENSIONS__ -Wl,-Bsymbolic-functions -flto=auto -ffat-lto-objects -specs=/usr/share/dpkg/no-pie-link.specs -o crasher crasher.o 
/bin/bash ../libtool  --tag=CC   --mode=link gcc -fno-optimize-sibling-calls -g -O2 -Werror=implicit-function-declaration -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -ffile-prefix-map=/<<PKGBUILDDIR>>=. -flto=auto -ffat-lto-objects -specs=/usr/share/dpkg/no-pie-compile.specs -Wformat -Werror=format-security -fno-stack-protector -fno-stack-clash-protection -mbranch-protection=none -fdebug-prefix-map=/<<PKGBUILDDIR>>=/usr/src/libunwind-1.8.1-0.1 -fexceptions -Wall -Wsign-compare -D__EXTENSIONS__  -Wl,-Bsymbolic-functions -flto=auto -ffat-lto-objects -specs=/usr/share/dpkg/no-pie-link.specs -o test-proc-info test-proc-info.o ../src/libunwind-aarch64.la 
/usr/bin/ld: .libs/Lperf-simple: hidden symbol `__aarch64_cas8_acq_rel' in /usr/lib/gcc/aarch64-linux-gnu/14/libgcc.a(cas_8_4.o) is referenced by DSO
/usr/bin/ld: final link failed: bad value

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https://bugs.launchpad.net/bugs/2095325

Title:
  libunwind: FTBFS on arm64 and i386 plus test failures

Status in libunwind package in Ubuntu:
  Confirmed
Status in libunwind package in Debian:
  Fix Released

Bug description:
  libunwind 1.7.2 fails to build from source on arm64 and i386 and
  introduces bugs in some programs. Version 1.8.1 fixes these issues but
  hasn't been uploaded in Debian yet.

  I don't think we need the update so I would simply wait for a change
  in Debian rather than introduce a delta.

  Launchpad won't let me point to several Debian bugs it seems so I'll
  list all the related bugs here (they should be fixed by the same
  upload anyway):

  - https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1082282
  - https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1082284
  - https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1082659
  - https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1091302

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