/source/CMakeLists.txt(249):  MY_CHECK_CXX_COMPILER_FLAG(-stdlib=libc++ )

/source/cmake/check_compiler_flag.cmake(28):  STRING(REGEX REPLACE [-,= +] _ result have_CXX_-stdlib=libc++ )

/source/cmake/check_compiler_flag.cmake(29):  SET(SAVE_CMAKE_REQUIRED_FLAGS  )

/source/cmake/check_compiler_flag.cmake(30):  SET(CMAKE_REQUIRED_FLAGS  -stdlib=libc++ )

/source/cmake/check_compiler_flag.cmake(31):  CHECK_CXX_SOURCE_COMPILES(int main(void) { return 0; } have_CXX__stdlib_libc__ FAIL_REGEX;argument unused during compilation;FAIL_REGEX;unsupported .*option;FAIL_REGEX;unknown .*option;FAIL_REGEX;unrecognized .*option;FAIL_REGEX;ignoring unknown option;FAIL_REGEX;warning:.*ignored;FAIL_REGEX;warning:.*is valid for.*but not for;FAIL_REGEX;warning:.*redefined;FAIL_REGEX;[Ww]arning: [Oo]ption )

-- Performing Test have_CXX__stdlib_libc__

-- Performing Test have_CXX__stdlib_libc__ - Failed

/source/cmake/check_compiler_flag.cmake(33):  SET(CMAKE_REQUIRED_FLAGS  )

/source/CMakeLists.txt(250):  IF(NOT have_CXX__stdlib_libc__ )

/source/CMakeLists.txt(251):  MESSAGE(FATAL_ERROR C++ Compiler requires support for -stdlib=libc++ )

CMake Error at CMakeLists.txt:251 (MESSAGE):

  C++ Compiler requires support for -stdlib=libc++

-- Configuring incomplete, errors occurred!

See also "/build/CMakeFiles/CMakeOutput.log".

See also "/build/CMakeFiles/CMakeError.log".

buildbot@2f11790aa1e1:/build$ rm -rf .ninja_*

buildbot@2f11790aa1e1:/build$ tail -n 30 /build/CMakeFiles/CMakeError.log

Change Dir: /build/CMakeFiles/CMakeScratch/TryCompile-RfQ4we

Run Build Command(s):/usr/bin/ninja cmTC_2cfad && [1/2] Building CXX object CMakeFiles/cmTC_2cfad.dir/src.cxx.o

[2/2] Linking CXX executable cmTC_2cfad

FAILED: cmTC_2cfad 

: && /usr/bin/clang++ -stdlib=libc++ -L/msan-libs -Wl,-rpath=/msan-libs CMakeFiles/cmTC_2cfad.dir/src.cxx.o -o cmTC_2cfad   && :

/usr/bin/ld: /msan-libs/libc++.so.1: undefined reference to `__msan_memset'

/usr/bin/ld: /msan-libs/libc++.so.1: undefined reference to `__msan_retval_origin_tls'

/usr/bin/ld: /msan-libs/libc++.so.1: undefined reference to `__msan_unpoison'

/usr/bin/ld: /msan-libs/libc++.so.1: undefined reference to `__msan_param_origin_tls'

/usr/bin/ld: /msan-libs/libc++.so.1: undefined reference to `__msan_memcpy'

/usr/bin/ld: /msan-libs/libc++.so.1: undefined reference to `__msan_retval_tls'

/usr/bin/ld: /msan-libs/libc++.so.1: undefined reference to `__msan_va_arg_overflow_size_tls'

/usr/bin/ld: /msan-libs/libc++.so.1: undefined reference to `__msan_va_arg_origin_tls'

/usr/bin/ld: /msan-libs/libc++.so.1: undefined reference to `__sanitizer_dtor_callback_fields'

/usr/bin/ld: /msan-libs/libc++.so.1: undefined reference to `__msan_memmove'

/usr/bin/ld: /msan-libs/libc++.so.1: undefined reference to `__msan_chain_origin'

/usr/bin/ld: /msan-libs/libc++.so.1: undefined reference to `__sanitizer_dtor_callback_vptr'

/usr/bin/ld: /msan-libs/libc++.so.1: undefined reference to `__msan_va_arg_tls'

/usr/bin/ld: /msan-libs/libc++.so.1: undefined reference to `__msan_warning_with_origin_noreturn'

/usr/bin/ld: /msan-libs/libc++.so.1: undefined reference to `__msan_set_alloca_origin_with_descr'

/usr/bin/ld: /msan-libs/libc++.so.1: undefined reference to `__msan_init'

/usr/bin/ld: /msan-libs/libc++.so.1: undefined reference to `__msan_param_tls'

clang++: error: linker command failed with exit code 1 (use -v to see invocation)

ninja: build stopped: subcommand failed.