incomplete rules.ninja files during `cmake --build` with QtCreator

i'm seeing the following error when running cmake --build on macos 10.13:

15:44:22: Running steps for project XXX...
15:44:22: Starting: "/usr/local/bin/cmake" --build . --target XXX
[0/1 ?/sec] Re-running CMake...
[snip, all configuration goes well]
-- Configuring done
-- Generating done
-- Build files have been written to: /Users/tim/build/xxx
ninja: error: rules.ninja:1527: unexpected EOF
  description = Lin
                   ^ near here
15:44:37: The process "/usr/local/bin/cmake" exited with code 1.
Error while building/deploying project XXX (kit: Unnamed-Clang (x86 64bit in /usr/bin))
The kit Unnamed-Clang (x86 64bit in /usr/bin) has configuration issues which might be the root cause for this problem.
When executing step "Make"
15:44:37: Elapsed time: 00:15.

if i understand it correctly cmake --build thinks that the generated project is out of date and re-runs cmake, which generates rules.ninja. then it runs ninja. however the files rules.ninja has not been completely written to disk. after waiting for a few moments, the build succeds.

afaict this can happen when the files is written, but not fsynced to disk, yet. this causes ninja to read an incomplete rules.ninja file. i'm not sure what's the correct way to handle this error. either the file descriptor of rules.ninja would have to be fsynced, or the sync command would have to be executed between invoking (re-running) cmake and ninja.