libunwind: Causes other ports to fail to build

[barracuda156]

:info:build [ 29%] Building ASM object projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins_arm64e_osx.dir/outline_atomic_helpers.dir/outline_atomic_cas8_1.S.o
:info:build cd /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_llvm-17/clang-17/work/build/projects/compiler-rt/lib/builtins && /Library/Developer/CommandLineTools/usr/bin/clang -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -DL_cas -DMODEL=1 -DSIZE=8 -I/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_llvm-17/clang-17/work/llvm-project-17.0.4.src/compiler-rt/lib/builtins -I/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_llvm-17/clang-17/work/build/projects/compiler-rt/lib/builtins -I/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_llvm-17/clang-17/work/llvm-project-17.0.4.src/compiler-rt/lib/builtins -I/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_llvm-17/clang-17/work/build/include -I/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_llvm-17/clang-17/work/llvm-project-17.0.4.src/llvm/include -O3 -DNDEBUG -arch arm64e -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX14.sdk -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk -mmacosx-version-min=10.7 -fPIC -O3 -fvisibility=hidden -DVISIBILITY_HIDDEN -Wall -fomit-frame-pointer -DHAS_ASM_LSE -Werror=format-nonliteral -DDONT_DEFINE_EPRINTF -arch arm64e -target arm64e-apple-macos10.7 -darwin-target-variant arm64e-apple-ios13.1-macabi -o CMakeFiles/clang_rt.builtins_arm64e_osx.dir/outline_atomic_helpers.dir/outline_atomic_cas8_1.S.o -c /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_llvm-17/clang-17/work/build/projects/compiler-rt/lib/builtins/outline_atomic_helpers.dir/outline_atomic_cas8_1.S
:info:build ld: warning: ignoring file '/opt/local/lib/libunwind.1.dylib': found architecture 'arm64', required architecture 'x86_64'
:info:build ld: Undefined symbols:
:info:build   __Unwind_RaiseException, referenced from:
:info:build       _wrap__Unwind_RaiseException in asan_interceptors.cpp.o
:info:build       substitution__Unwind_RaiseException in asan_interceptors.cpp.o
:info:build clang: error: linker command failed with exit code 1 (use -v to see invocation)

Where is this x86_64 coming from?

I was simply upgrading what I have. 17.0.3 built with no issues:

svacchanda@43-19 ~ % port -v installed libunwind
The following ports are currently installed:
  libunwind @5.0.1_0 (active) requested_variants='' platform='darwin 23' archs='arm64' date='2023-10-23T10:31:41+0800'
svacchanda@43-19 ~ % port -v installed clang-17
The following ports are currently installed:
  clang-17 @17.0.1_0+analyzer requested_variants='' platform='darwin 23' archs='arm64' date='2023-10-13T21:56:43+0800'
  clang-17 @17.0.3_0+analyzer (active) requested_variants='' platform='darwin 23' archs='arm64' date='2023-10-18T04:50:53+0800'
svacchanda@43-19 ~ % port -v installed llvm-17
The following ports are currently installed:
  llvm-17 @17.0.1_0 requested_variants='' platform='darwin 23' archs='arm64' date='2023-10-13T19:13:55+0800'
  llvm-17 @17.0.3_0 requested_variants='' platform='darwin 23' archs='arm64' date='2023-10-17T22:39:17+0800'
  llvm-17 @17.0.4_0 (active) requested_variants='' platform='darwin 23' archs='arm64' date='2023-11-01T19:47:36+0800'

[ryandesign (Ryan Carsten Schmidt)]

Having libunwind active causes problems for many ports. Try deactivating it.

[barracuda156]

Replying to ryandesign:

Having libunwind active causes problems for many ports. Try deactivating it.

Ok, rerunning now. If it helps, we should add a conflict.

UPD. So yeah, it worked.

[ryandesign (Ryan Carsten Schmidt)]

Many ports probably conflict with libunwind being active so we would have to add the conflict to many ports. It would be better, as has been suggested many times over the years, for libunwind to be moved so that it is not installed in /opt/local/lib but instead somewhere under /opt/local/libexec and the currently four ports that say they depend on it can be modified to find it there, if indeed they truly require it and the dependency wasn't just added due to a misunderstanding.

[ryandesign (Ryan Carsten Schmidt)]

Duplicate of #66250.