[Android-tools-devel] Bug#1114049: android-platform-external-libunwind: FTBFS: include/libunwind_i.h:92:10: error: 'unreachable' redefined [-Werror]

[Santiago Vila]

Package: src:android-platform-external-libunwind
Version: 10.0.0+r36-4.1
Severity: serious
Tags: ftbfs forky sid

Dear maintainer:

During a rebuild of all packages in unstable, your package failed to build.

Below you will find how the build ends (probably the most relevant part,
but not necessarily). If required, the full build log is available here:

https://people.debian.org/~sanvila/build-logs/202509/

About the archive rebuild: The build was made on virtual machines from AWS,
using sbuild and a reduced chroot with only build-essential packages.

If you could not reproduce the bug please contact me privately, as I
am willing to provide ssh access to a virtual machine where the bug is
fully reproducible.

If this is really a bug in one of the build-depends, please use
reassign and add an affects on src:android-platform-external-libunwind, so that this is still
visible in the BTS web page for this package.

Thanks.

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[...]
 debian/rules clean
dh clean --without autoreconf
   dh_clean
 debian/rules binary
dh binary --without autoreconf
   dh_update_autotools_config
   debian/rules override_dh_auto_build
make[1]: Entering directory '/<<PKGBUILDDIR>>'
dh_auto_build --buildsystem=makefile -- -f debian/libunwind.mk
	make -j2 "INSTALL=install --strip-program=true" -f debian/libunwind.mk
make[2]: Entering directory '/<<PKGBUILDDIR>>'
mkdir --parents debian/out
ln -s /usr/lib/7zip/7z.so debian/out/lib7z.so
cc src/mi/init.c src/mi/flush_cache.c src/mi/mempool.c src/m [too-long-redacted] lib -lc -lgcc -Ldebian/out -l7z
In file included from include/dwarf_i.h:10,
                 from src/dwarf/Gparser.c:27,
                 from src/dwarf/Lparser.c:4:
include/libunwind_i.h:92:10: error: ‘unreachable’ redefined [-Werror]
   92 | # define unreachable() __builtin_unreachable()
      |          ^~~~~~~~~~~
In file included from src/dwarf/Gparser.c:26:
/usr/lib/gcc/x86_64-linux-gnu/15/include/stddef.h:468:9: note: this is the location of the previous definition
  468 | #define unreachable() (__builtin_unreachable ())
      |         ^~~~~~~~~~~
cc1: all warnings being treated as errors
In file included from include/dwarf_i.h:10,
                 from src/dwarf/Gfind_proc_info-lsb.c:33,
                 from src/dwarf/Lfind_proc_info-lsb.c:4:
include/libunwind_i.h:92:10: error: ‘unreachable’ redefined [-Werror]
   92 | # define unreachable() __builtin_unreachable()
      |          ^~~~~~~~~~~
In file included from src/dwarf/Gfind_proc_info-lsb.c:29:
/usr/lib/gcc/x86_64-linux-gnu/15/include/stddef.h:468:9: note: this is the location of the previous definition
  468 | #define unreachable() (__builtin_unreachable ())
      |         ^~~~~~~~~~~
cc1: all warnings being treated as errors
In file included from include/dwarf_i.h:10,
                 from src/dwarf/Gfind_proc_info-lsb.c:33:
include/libunwind_i.h:92:10: error: ‘unreachable’ redefined [-Werror]
   92 | # define unreachable() __builtin_unreachable()
      |          ^~~~~~~~~~~
In file included from src/dwarf/Gfind_proc_info-lsb.c:29:
/usr/lib/gcc/x86_64-linux-gnu/15/include/stddef.h:468:9: note: this is the location of the previous definition
  468 | #define unreachable() (__builtin_unreachable ())
      |         ^~~~~~~~~~~
cc1: all warnings being treated as errors
In file included from include/dwarf_i.h:10,
                 from src/dwarf/Gparser.c:27:
include/libunwind_i.h:92:10: error: ‘unreachable’ redefined [-Werror]
   92 | # define unreachable() __builtin_unreachable()
      |          ^~~~~~~~~~~
In file included from src/dwarf/Gparser.c:26:
/usr/lib/gcc/x86_64-linux-gnu/15/include/stddef.h:468:9: note: this is the location of the previous definition
  468 | #define unreachable() (__builtin_unreachable ())
      |         ^~~~~~~~~~~
cc1: all warnings being treated as errors
src/ptrace/_UPT_get_dyn_info_list_addr.c: In function ‘get_list_addr’:
src/ptrace/_UPT_get_dyn_info_list_addr.c:75:10: note: ‘#pragma message: Implement get_list_addr(), please.’
   75 | # pragma message("Implement get_list_addr(), please.")
      |          ^~~~~~~
In file included from src/elfxx.h:34,
                 from src/elf64.h:7,
                 from src/elf64.c:2:
include/libunwind_i.h:92:10: error: ‘unreachable’ redefined [-Werror]
   92 | # define unreachable() __builtin_unreachable()
      |          ^~~~~~~~~~~
In file included from src/elfxx.h:28:
/usr/lib/gcc/x86_64-linux-gnu/15/include/stddef.h:468:9: note: this is the location of the previous definition
  468 | #define unreachable() (__builtin_unreachable ())
      |         ^~~~~~~~~~~
cc1: all warnings being treated as errors
make[2]: *** [debian/libunwind.mk:139: build] Error 1
make[2]: Leaving directory '/<<PKGBUILDDIR>>'
dh_auto_build: error: make -j2 "INSTALL=install --strip-program=true" -f debian/libunwind.mk returned exit code 2
make[1]: *** [debian/rules:13: override_dh_auto_build] Error 25
make[1]: Leaving directory '/<<PKGBUILDDIR>>'
make: *** [debian/rules:10: binary] Error 2
dpkg-buildpackage: error: debian/rules binary subprocess returned exit status 2
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