[Bug 241402] Unable to installworld from read-only /usr/src and /usr/obj

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241402

            Bug ID: 241402
           Summary: Unable to installworld from read-only /usr/src and
                    /usr/obj
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: bugs at FreeBSD.org
          Reporter: np at FreeBSD.org
                CC: dim at FreeBSD.org

installworld no longer works if /usr/src and /usr/obj are mounted read-only.
This seems to be related to the recent import of clang/llvm 9.0 as it used to
work previously.  The exact error with a fresh tree @ r353875 is shown here:

===> lib/clang (install)
===> lib/clang/libllvm (install)
===> lib/clang/libclang (install)
===> lib/clang/liblldb (install)
===> lib/clang/headers (install)
clang-tblgen -gen-arm-fp16  -I /usr/src/contrib/llvm/tools/clang/include/clang/
Basic -d arm_fp16.h.d  -o arm_fp16.h /usr/src/contrib/llvm/tools/clang/include/
clang/Basic/arm_fp16.td
clang-tblgen: error opening arm_fp16.h.d:Read-only file system
*** Error code 1

Stop.
make[6]: stopped in /usr/src/lib/clang/headers
*** Error code 1

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