In third_party/widevine/cdm/widevine_cdm.gyp, we have a widevine_cdm_manifest target:

    {
      # GN version: //third_party/widevine/cdm:widevine_cdm_manifest
      'target_name': 'widevine_cdm_manifest',
      'type': 'none',
      'conditions': [
        [ 'branding == "Chrome"', {
          'copies': [{
            'destination': '<(PRODUCT_DIR)/WidevineCdm',
            'files': [ '<(widevine_cdm_manifest_file)' ],
          }],
        }],
      ],
    },

On platforms like Linux, |widevine_cdm_manifest_file| is empty, where I suppose that nothing will be copied.

However, it seems gyp + ninja don't agree. The ninja file generated is like:

build WidevineCdm/.: copy ../../third_party/widevine/cdm

Then when I build widevine_cdm_manifest, it'll do the following:

COPY ../../third_party/widevine/cdm WidevineCdm

which will copy the whole src/third_party/widevine/cdm folder into out/{Debug|Release}/WidevineCdm.

This doesn't affect anything today, but it looks really bad and should be fixed.

We don't have this issue in GN as GN doesn't allow copy with empty input files.