External Issue: Examples compilation failures on master

16778, “PHHargrove”, “Examples compilation failures on master”, “2020-11-24T05:18:14Z”

Somewhere between success on master at 2b7fddc5 and a recent failure at 65f97bca, something changed to produce the following messages when building examples:

cd /home/data2/upcnightly/dirac/EX-dirac-ibv-clang_CX5/work/dbg/chapel && . util/setchplenv.bash && cd /home/data2/upcnightly/dirac/EX-dirac-ibv-clang_CX5/work/dbg/gasnet/tests/upcr-harness/external-chapel && \
  env PATH=$PATH CHPL_COMM_DEBUG=1  \
    /usr/bin/gmake -C /scratch/upcnightly/EX-dirac-ibv-clang_CX5/runtime/bld/dbg/chapel/examples hello6-taskpar-dist CHPL_FLAGS+="" 2>&1
Setting CHPL_HOME to /home/data2/upcnightly/dirac/EX-dirac-ibv-clang_CX5/work/dbg/chapel
Updating PATH to include /home/data2/upcnightly/dirac/EX-dirac-ibv-clang_CX5/work/dbg/chapel/bin/linux64-x86_64
                     and /home/data2/upcnightly/dirac/EX-dirac-ibv-clang_CX5/work/dbg/chapel/util
Updating MANPATH to include /home/data2/upcnightly/dirac/EX-dirac-ibv-clang_CX5/work/dbg/chapel/man
gmake[3]: Entering directory `/scratch/upcnightly/EX-dirac-ibv-clang_CX5/runtime/bld/dbg/chapel/test/release/examples'
chpl -o hello6-taskpar-dist hello6-taskpar-dist.chpl
/home/data2/upcnightly/dirac/EX-dirac-ibv-clang_CX5/work/dbg/chapel/make/Makefile.base:183: /home/data2/upcnightly/dirac/EX-dirac-ibv-clang_CX5/work/dbg/chapel/third-party/llvm/Makefile.include-none: No such file or directory
make[4]: *** No rule to make target `/home/data2/upcnightly/dirac/EX-dirac-ibv-clang_CX5/work/dbg/chapel/third-party/llvm/Makefile.include-none'.  Stop.
error: compiling generated source
gmake[3]: *** [hello6-taskpar-dist] Error 1

Log of last known-good configure/build/install: here
Log of first known-bad configure/build/install: here