Clang Code Model fails for targets unsupported by libclang

export QT_LOGGING_RULES=qtc.clang*=true
export LIBCLANG_TIMING=1
export QTC_CLANG_ENABLE_STACKTRACES=1

Arguments to libclang: -nostdinc -nostdinc++ -fmessage-length=0 -ffunction-sections -fdata-sections -mlittle-endian -mxl-soft-mul -mcpu=v11.0 -g -std=gnu++1z -fsyntax-only -m64 --target=microblaze-xilinx-elf -DQ_CREATOR_RUN -I /home/hatred/programming/work/Task/MicroBlaze/workspaces/kcu116-test/kcu116-cxx-usb31-uvc/../kcu116-cxx-usb31-uvc_bsp/microblaze_0/include -isystem /home/hatred/bin/Xilinx/2018.3/microblaze/baremetal/microblaze-xilinx-elf/include/c++/7.3.1 -isystem /home/hatred/bin/Xilinx/2018.3/microblaze/baremetal/microblaze-xilinx-elf/include/c++/7.3.1/microblaze-xilinx-elf -isystem /home/hatred/bin/Xilinx/2018.3/microblaze/baremetal/microblaze-xilinx-elf/include/c++/7.3.1/backward -isystem /usr/lib/clang/8.0.0/include -isystem /home/hatred/bin/Xilinx/2018.3/microblaze/baremetal/lib/gcc/microblaze-xilinx-elf/7.3.1/include -isystem /home/hatred/bin/Xilinx/2018.3/microblaze/baremetal/lib/gcc/microblaze-xilinx-elf/7.3.1/include-fixed -isystem /home/hatred/bin/Xilinx/2018.3/microblaze/baremetal/microblaze-xilinx-elf/include -isystem /home/hatred/bin/Xilinx/2018.3/microblaze/baremetal/microblaze-xilinx-elf/sysroot/usr/include -I /tmp/QtCreator-fyIgYw/clang-uiheader-SHuMZu -fmessage-length=0 -fdiagnostics-show-note-include-stack -fretain-comments-from-system-headers -fmacro-backtrace-limit=0 -ferror-limit=1000 -x c++-header -Wno-unknown-pragmas -Wno-unknown-warning-option -Wno-documentation-unknown-command -Weverything -Wno-c++98-compat -Wno-c++98-compat-pedantic -Wno-unused-macros -Wno-newline-eof -Wno-exit-time-destructors -Wno-global-constructors -Wno-gnu-zero-variadic-macro-arguments -Wno-documentation -Wno-shadow -Wno-switch-enum -Wno-missing-prototypes -Wno-used-but-marked-unused -v /home/hatred/programming/work/Task/MicroBlaze/workspaces/kcu116-test/kcu116-cxx-usb31-uvc/src/platform.h
clang version 8.0.0 (tags/RELEASE_800/final)
Target: microblaze-xilinx-unknown-elf
Thread model: posix
InstalledDir: 
Precompiling preamble:   0.0001 (100.0%)   0.0000 (100.0%)   0.0001 (100.0%)   0.0001 (100.0%)  
Parsing /home/hatred/programming/work/Task/MicroBlaze/workspaces/kcu116-test/kcu116-cxx-usb31-uvc/src/platform.h:   0.0000 (100.0%)   0.0000 (100.0%)   0.0000 (100.0%)   0.0000 (100.0%)  
Parsing /home/hatred/programming/work/Task/MicroBlaze/workspaces/kcu116-test/kcu116-cxx-usb31-uvc/src/platform.h failed: CXError_Failure
Reparsing /home/hatred/programming/work/Task/MicroBlaze/workspaces/kcu116-test/kcu116-cxx-usb31-uvc/src/platform.h failed: 3

clang++ -nostdinc -nostdinc++ -fmessage-length=0 -ffunction-sections -fdata-sections -mlittle-endian -mxl-soft-mul -mcpu=v11.0 -g -std=gnu++1z -fsyntax-only -m64 --target=microblaze-xilinx-elf -DQ_CREATOR_RUN -I /home/hatred/programming/work/Epiphan/Task/MicroBlaze/workspaces/kcu116-test/kcu116-cxx-usb31-uvc/../kcu116-cxx-usb31-uvc_bsp/microblaze_0/include -isystem /home/hatred/bin/Xilinx/2018.3/microblaze/baremetal/microblaze-xilinx-elf/include/c++/7.3.1 -isystem /home/hatred/bin/Xilinx/2018.3/microblaze/baremetal/microblaze-xilinx-elf/include/c++/7.3.1/microblaze-xilinx-elf -isystem /home/hatred/bin/Xilinx/2018.3/microblaze/baremetal/microblaze-xilinx-elf/include/c++/7.3.1/backward -isystem /usr/lib/clang/8.0.0/include -isystem /home/hatred/bin/Xilinx/2018.3/microblaze/baremetal/lib/gcc/microblaze-xilinx-elf/7.3.1/include -isystem /home/hatred/bin/Xilinx/2018.3/microblaze/baremetal/lib/gcc/microblaze-xilinx-elf/7.3.1/include-fixed -isystem /home/hatred/bin/Xilinx/2018.3/microblaze/baremetal/microblaze-xilinx-elf/include -isystem /home/hatred/bin/Xilinx/2018.3/microblaze/baremetal/microblaze-xilinx-elf/sysroot/usr/include -I /tmp/QtCreator-fyIgYw/clang-uiheader-SHuMZu -fmessage-length=0 -fdiagnostics-show-note-include-stack -fretain-comments-from-system-headers -fmacro-backtrace-limit=0 -ferror-limit=1000 -x c++-header -Wno-unknown-pragmas -Wno-unknown-warning-option -Wno-documentation-unknown-command -Weverything -Wno-c++98-compat -Wno-c++98-compat-pedantic -Wno-unused-macros -Wno-newline-eof -Wno-exit-time-destructors -Wno-global-constructors -Wno-gnu-zero-variadic-macro-arguments -Wno-documentation -Wno-shadow -Wno-switch-enum -Wno-missing-prototypes -Wno-used-but-marked-unused -v /home/hatred/programming/work/Epiphan/Task/MicroBlaze/workspaces/kcu116-test/kcu116-cxx-usb31-uvc/src/platform.h
clang-8: error: unknown argument: '-mxl-soft-mul'
clang version 8.0.0 (tags/RELEASE_800/final)
Target: microblaze-xilinx-unknown-elf
Thread model: posix
InstalledDir: /usr/bin

clang++ -nostdinc -nostdinc++ -fmessage-length=0 -ffunction-sections -fdata-sections -mlittle-endian -g -std=gnu++1z -fsyntax-only -m64 --target=microblaze-xilinx-elf -DQ_CREATOR_RUN -I /home/hatred/programming/work/Epiphan/Task/MicroBlaze/workspaces/kcu116-test/kcu116-cxx-usb31-uvc/../kcu116-cxx-usb31-uvc_bsp/microblaze_0/include -isystem /home/hatred/bin/Xilinx/2018.3/microblaze/baremetal/microblaze-xilinx-elf/include/c++/7.3.1 -isystem /home/hatred/bin/Xilinx/2018.3/microblaze/baremetal/microblaze-xilinx-elf/include/c++/7.3.1/microblaze-xilinx-elf -isystem /home/hatred/bin/Xilinx/2018.3/microblaze/baremetal/microblaze-xilinx-elf/include/c++/7.3.1/backward -isystem /usr/lib/clang/8.0.0/include -isystem /home/hatred/bin/Xilinx/2018.3/microblaze/baremetal/lib/gcc/microblaze-xilinx-elf/7.3.1/include -isystem /home/hatred/bin/Xilinx/2018.3/microblaze/baremetal/lib/gcc/microblaze-xilinx-elf/7.3.1/include-fixed -isystem /home/hatred/bin/Xilinx/2018.3/microblaze/baremetal/microblaze-xilinx-elf/include -isystem /home/hatred/bin/Xilinx/2018.3/microblaze/baremetal/microblaze-xilinx-elf/sysroot/usr/include -I /tmp/QtCreator-fyIgYw/clang-uiheader-SHuMZu -fmessage-length=0 -fdiagnostics-show-note-include-stack -fretain-comments-from-system-headers -fmacro-backtrace-limit=0 -ferror-limit=1000 -x c++-header -Wno-unknown-pragmas -Wno-unknown-warning-option -Wno-documentation-unknown-command -Weverything -Wno-c++98-compat -Wno-c++98-compat-pedantic -Wno-unused-macros -Wno-newline-eof -Wno-exit-time-destructors -Wno-global-constructors -Wno-gnu-zero-variadic-macro-arguments -Wno-documentation -Wno-shadow -Wno-switch-enum -Wno-missing-prototypes -Wno-used-but-marked-unused -v /home/hatred/programming/work/Epiphan/Task/MicroBlaze/workspaces/kcu116-test/kcu116-cxx-usb31-uvc/src/platform.h
clang version 8.0.0 (tags/RELEASE_800/final)
Target: microblaze-xilinx-unknown-elf
Thread model: posix
InstalledDir: /usr/bin
 "/usr/bin/clang-8" -cc1 -triple microblaze-xilinx-unknown-elf -fsyntax-only -disable-free -disable-llvm-verifier -discard-value-names -main-file-name platform.h -mrelocation-model static -mthread-model posix -mdisable-fp-elim -fmath-errno -no-integrated-as -mconstructor-aliases -dwarf-column-info -debug-info-kind=limited -dwarf-version=4 -debugger-tuning=gdb -v -ffunction-sections -fdata-sections -nostdsysteminc -nobuiltininc -resource-dir /usr/lib/clang/8.0.0 -isystem /home/hatred/bin/Xilinx/2018.3/microblaze/baremetal/microblaze-xilinx-elf/include/c++/7.3.1 -isystem /home/hatred/bin/Xilinx/2018.3/microblaze/baremetal/microblaze-xilinx-elf/include/c++/7.3.1/microblaze-xilinx-elf -isystem /home/hatred/bin/Xilinx/2018.3/microblaze/baremetal/microblaze-xilinx-elf/include/c++/7.3.1/backward -isystem /usr/lib/clang/8.0.0/include -isystem /home/hatred/bin/Xilinx/2018.3/microblaze/baremetal/lib/gcc/microblaze-xilinx-elf/7.3.1/include -isystem /home/hatred/bin/Xilinx/2018.3/microblaze/baremetal/lib/gcc/microblaze-xilinx-elf/7.3.1/include-fixed -isystem /home/hatred/bin/Xilinx/2018.3/microblaze/baremetal/microblaze-xilinx-elf/include -isystem /home/hatred/bin/Xilinx/2018.3/microblaze/baremetal/microblaze-xilinx-elf/sysroot/usr/include -D Q_CREATOR_RUN -I /home/hatred/programming/work/Epiphan/Task/MicroBlaze/workspaces/kcu116-test/kcu116-cxx-usb31-uvc/../kcu116-cxx-usb31-uvc_bsp/microblaze_0/include -I /tmp/QtCreator-fyIgYw/clang-uiheader-SHuMZu -Wno-unknown-pragmas -Wno-unknown-warning-option -Wno-documentation-unknown-command -Weverything -Wno-c++98-compat -Wno-c++98-compat-pedantic -Wno-unused-macros -Wno-newline-eof -Wno-exit-time-destructors -Wno-global-constructors -Wno-gnu-zero-variadic-macro-arguments -Wno-documentation -Wno-shadow -Wno-switch-enum -Wno-missing-prototypes -Wno-used-but-marked-unused -std=gnu++1z -fdeprecated-macro -fno-dwarf-directory-asm -fdebug-compilation-dir /home/hatred -ferror-limit 1000 -fmacro-backtrace-limit 0 -fmessage-length 0 -fobjc-runtime=gcc -fcxx-exceptions -fexceptions -fdiagnostics-show-option -fdiagnostics-show-note-include-stack -fcolor-diagnostics -fretain-comments-from-system-headers -x c++-header /home/hatred/programming/work/Epiphan/Task/MicroBlaze/workspaces/kcu116-test/kcu116-cxx-usb31-uvc/src/platform.h
error: unknown target triple 'microblaze-xilinx-unknown-elf', please use -triple or -arch