> ninja -C out/Default -j 100 chromeos_unittests
ninja: Entering directory `out/Default'
[1/1] Regenerating ninja files
FAILED: build.ninja 
../../buildtools/linux64/gn --root=../.. -q gen .
ERROR Dependency cycle:
  //build/config:exe_and_shlib_deps ->
  //buildtools/third_party/libc++:libc++ ->
  //build/config:exe_and_shlib_deps

My gn args:
is_debug = false
dcheck_always_on = true
is_component_build = true
target_os = "chromeos"
use_goma = true

Assigning to thomasanderson@, who seems to be the author of these files.