cmake config error "name too long"

[L00pZBreak3r]

Configuring the llvm-project with cmake -G ninja gives error

-- Performing Test HAVE_STEADY_CLOCK -- success
-- Performing Test HAVE_PTHREAD_AFFINITY -- failed to compile
-- Configuring done (47.9s)
CMake Error:
  Running

   'F:/Qt/ninja/ninja.exe' '-C' 'F:/Qt/llvm-project.build/build' '-t' 'restat' 'build.ninja' 'F:/Qt/llvm-project.build/build/cmake_install.cmake' 'F:/Qt/llvm-project.build/build/lib/Demangle/cmake_install.cmake' 'F:/Qt/llvm-project.build/build/lib/Support/cmake_install.cmake' 'F:/Qt/llvm-project.build/build/lib/Support/BLAKE3/cmake_install.cmake' 'F:/Qt/llvm-project.build/build/lib/TableGen/cmake_install.cmake' 'F:/Qt/llvm-project.build/build/utils/TableGen/cmake_install.cmake' 'F:/Qt/llvm-project.build/build/utils/TableGen/Basic/cmake_install.cmake' 'F:/Qt/llvm-project.build/build/utils/TableGen/Common/cmake_install.cmake' 'F:/Qt/llvm-project.build/build/include/cmake_install.cmake' 'F:/Qt/llvm-project.build/build/include/llvm/cmake_install.cmake' 'F:/Qt/llvm-project.build/build/include/llvm/CodeGen/cmake_install.cmake' 'F:/Qt/llvm-project.build/build/include/llvm/IR/cmake_install.cmake' 'F:/Qt/llvm-project.build/build/include/llvm/Support/cmake_install.cmake' 'F:/Qt/llvm-project.build/build/include/llvm/Frontend/cmake_install.cmake'  ... (EXTREMELY LONG LINE)

  failed with:

   name too long


-- Generating done (64.3s)
CMake Generate step failed.  Build files cannot be regenerated correctly.

[DimitryAndric]

This looks like one of those Windows limitations, where paths cannot exceed 260 characters? There are reports like that here: ninja-build/ninja#1900 and here: https://gitlab.kitware.com/cmake/cmake/-/issues/22435

[L00pZBreak3r]

But a week or maybe two ago llvm-project did not require calling ninja with this extremely long command line. llvm-project has been living quite happily without this its whole life but suddenly started to use this extremely long command line just a week ago. Why? What exactly happened then that began to call ninja with this extremely long command line?

Before this commit everything worked fine.

[frasercrmck]

Sorry, just spotted this ticket. Are you still seeing this issue? I would have thought that effb2f1 would fix the problem.

[raduCh04]

Hey, did you solve it? Unfortunately I have the same issue on windows trying to configure DPC++ and cannot think about a solution.