[Bug 203064] buildworld via external toolchain (clang) throws assertion

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=203064

            Bug ID: 203064
           Summary: buildworld via external toolchain (clang) throws
                    assertion
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: mips
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: sbruno at FreeBSD.org

Created attachment 160964
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=160964&action=edit
Clang error output test files for this case.

Trying to execute a limited buildworld via an external toolchain (svn co of
clang head).

I'm hitting an assertion in clang regarding out MIPSIII target that is used
(which is not the default for clang).

--------------------------------------------------------------
>>> stage 4.2: building libraries
--------------------------------------------------------------
===> gnu/lib/libssp/libssp_nonshared (obj,depend,all,install)
===> gnu/lib/libgcc (obj,depend,all,install)
===> lib/libcompiler_rt (obj,depend,all,install)
Assertion failed: (((!isGP64bit() && (isABI_O32() || isABI_EABI())) ||
(isGP64bit() && (isABI_N32() || isABI_N64()))) && "Invalid  Arch & ABI pair."),
function MipsSubtarget, file
/home/sbruno/clang/llvm/lib/Target/Mips/MipsSubtarget.cpp, line 94.
clang-3.8: error: unable to execute command: Abort trap (core dumped)
clang-3.8: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 3.8.0 (trunk 247514)
Target: mips-unknown-freebsd11.0
Thread model: posix
InstalledDir: /home/sbruno/clang/build/bin
clang-3.8: note: diagnostic msg: PLEASE submit a bug report to
http://llvm.org/bugs/ and include the crash backtrace, preprocessed source, and
associated run script.
clang-3.8: note: diagnostic msg: 
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-3.8: note: diagnostic msg: /tmp/ssp-local-2bb599.c
clang-3.8: note: diagnostic msg: /tmp/ssp-local-2bb599.sh
clang-3.8: note: diagnostic msg: 

********************
--- ssp-local.o ---
*** [ssp-local.o] Error code 254

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