[MacPorts] #63085: clang-12: compiler-rt build sometimes fails parallel building

[MacPorts]

#63085: clang-12: compiler-rt build sometimes fails parallel building
-----------------------+----------------------
  Reporter:  blair     |      Owner:  kencu
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  clang-12  |
-----------------------+----------------------

Comment (by blair):

 Here's all the strings with Error:

 {{{
 $ grep Error clang-12
 CMake Error: failed to create symbolic link '/opt/local/var/macports/build
 /_Users_blairzajac_Code_MacPorts_macports-
 ports.git_lang_llvm-12/clang-12/work/build/projects/compiler-
 rt/lib/builtins/outline_atomic_helpers.dir/outline_atomic_ldclr4_4.S':
 file already exists
 make[2]: *** [projects/compiler-
 rt/lib/builtins/outline_atomic_helpers.dir/outline_atomic_ldclr4_4.S]
 Error 1
 make[1]: *** [projects/compiler-
 rt/lib/builtins/CMakeFiles/clang_rt.cc_kext_arm64_osx.dir/all] Error 2
 CMake Error: failed to create symbolic link '/opt/local/var/macports/build
 /_Users_blairzajac_Code_MacPorts_macports-
 ports.git_lang_llvm-12/clang-12/work/build/projects/compiler-
 rt/lib/builtins/outline_atomic_helpers.dir/outline_atomic_ldset1_2.S':
 file already exists
 make[2]: *** [projects/compiler-
 rt/lib/builtins/outline_atomic_helpers.dir/outline_atomic_ldset1_2.S]
 Error 1
 make[1]: *** [projects/compiler-
 rt/lib/builtins/CMakeFiles/clang_rt.cc_kext_arm64e_osx.dir/all] Error 2
 make: *** [all] Error 2
 Error: Failed to build clang-12: command execution failed
 Error: See /opt/local/var/macports/logs
 /_Users_blairzajac_Code_MacPorts_macports-
 ports.git_lang_llvm-12/clang-12/main.log for details.
 Error: Follow https://guide.macports.org/#project.tickets if you believe
 there is a bug.
 Error: Processing of port clang-12 failed
 }}}

-- 
Ticket URL: <https://trac.macports.org/ticket/63085#comment:6>
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