[llvm-dev] failing bootstrap: C++11 or greater is required but the compiler does not support c++11

[Kostya Serebryany via llvm-dev]

several hours ago one of the bots that does a bootstrap started to fail
(http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux-fuzzer)

CMake Error at projects/libcxx/CMakeLists.txt:365 (message):
  C++11 or greater is required but the compiler does not support c++11


I can reproduce it locally with

cmake -GNinja -DCMAKE_CXX_COMPILER=clang++ ~/llvm


Goes away if I remove -GNinja. (!!!)
Does anyone else see this?
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