[MacPorts] #63038: clang12: please re-enable the +analyzer as a default variant

[MacPorts]

#63038: clang12: please re-enable the +analyzer as a default variant
-------------------------+----------------------
  Reporter:  mouse07410  |      Owner:  kencu
      Type:  request     |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  clang-12    |
-------------------------+----------------------

Comment (by kencu):

 your compiler-rt build failure is something different, by the way:
 {{{
 :info:build CMake Error: failed to create symbolic link
 '/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_llvm-12/clang-12/work/build/projects
 /compiler-
 rt/lib/builtins/outline_atomic_helpers.dir/outline_atomic_ldclr1_3.S':
 file already exists
 :info:build cd
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_llvm-12/clang-12/work/build/projects
 /compiler-rt/lib/builtins &&
 /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang
 -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS
 -I/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_llvm-12/clang-12/work/build/projects
 /compiler-rt/lib/builtins
 -I/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_llvm-12/clang-12/work
 /llvm-project-12.0.0.src/compiler-rt/lib/builtins
 -I/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_llvm-12/clang-12/work/build/include
 -I/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_llvm-12/clang-12/work
 /llvm-project-12.0.0.src/llvm/include -O3 -DNDEBUG -arch armv7em -isysroot
 /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX11.3.sdk
 -isysroot
 /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX11.3.sdk
 -Oz -Wall -fomit-frame-pointer -ffreestanding -arch armv7em -fPIC -mfloat-
 abi=soft -o
 CMakeFiles/clang_rt.soft_pic_armv7em_macho_embedded.dir/arm/sync_fetch_and_sub_4.S.o
 -c
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_llvm-12/clang-12/work
 /llvm-project-12.0.0.src/compiler-
 rt/lib/builtins/arm/sync_fetch_and_sub_4.S
 :info:build make[2]: *** [projects/compiler-
 rt/lib/builtins/outline_atomic_helpers.dir/outline_atomic_ldclr1_3.S]
 Error 1

 }}}

 there seems to be a race condition in some build attempts for clang.
 Marcus disabled parallel_building one time to get past this -- but as it
 only happens to me 1 / 100 times  I build clang, and because building
 clang-12 without parallel building takes about 1.2 years, I re-enabled it
 again.

 If you know how to properly fix the race condition, I'm sure upstream
 would be delighted. I have no idea, myself.

 If it really bugs you, you can disable parallel building in your clang
 Portfile.

 If it happens a lot, on the buildbots and elsewhere, and there is no
 choice left but to disable parallel_buildling, so be it, we'll disable it
 and it can take 1.2 years to build clang.

-- 
Ticket URL: <https://trac.macports.org/ticket/63038#comment:5>
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