GNU libgomp: OMP_DEFAULT_DEVICE

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### 3.3 `OMP_DEFAULT_DEVICE` – Set the device used in target regions

Description:

  Set to choose the device which is used in a `target` region, unless the value is overridden by `omp_set_default_device` or by a `device` clause. The value shall be the nonnegative device number. If no device with the given device number exists, the code is executed on the host. If unset, device number 0 will be used.

See also:

  omp_get_default_device, omp_set_default_device,

Reference:

  OpenMP specification v4.0, Section 4.11