[MacPorts] #65598: clang-devel @20220731 fails to build with clang-11 as bootstrap compiler

[MacPorts]

#65598: clang-devel @20220731 fails to build with clang-11 as bootstrap compiler
--------------------------+--------------------------
  Reporter:  kencu        |      Owner:  cjones051073
      Type:  defect       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  clang-devel  |
--------------------------+--------------------------

Comment (by kencu):

 clang-13 is good. Trying to bootstrap with clang-12 now.

 For systems prior to 10.14, we have this error (at least):

 {{{
 In file included from /opt/local/var/macports/build
 /_opt_bblocal_var_buildworker_ports_build_ports_lang_llvm-devel/clang-
 devel/work/llvm-project-02b3a358926e7bbcac9226cbecbfc3067c2ad61b/compiler-
 rt/lib/lsan/../sanitizer_common/sanitizer_internal_defs.h:15:
 /opt/local/var/macports/build
 /_opt_bblocal_var_buildworker_ports_build_ports_lang_llvm-devel/clang-
 devel/work/llvm-project-02b3a358926e7bbcac9226cbecbfc3067c2ad61b/compiler-
 rt/lib/lsan/../sanitizer_common/sanitizer_platform.h:93:7: error:
 'TARGET_OS_DRIVERKIT' is not defined, evaluates to 0 [-Werror,-Wundef-
 prefix=TARGET_OS_]
 #  if TARGET_OS_DRIVERKIT
       ^
 }}}

 and that one is best handled by adding it to legacysupport and making sure
 legacysupport is used when building on 10.13.

-- 
Ticket URL: <https://trac.macports.org/ticket/65598#comment:2>
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