GNU libgomp: OMP_NESTED

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### 3.6 `OMP_NESTED` – Nested parallel regions

Description:

  Enable or disable nested parallel regions, i.e., whether team members are allowed to create new teams. The value of this environment variable shall be `TRUE` or `FALSE`. If undefined, nested parallel regions are disabled by default.

See also:

  omp_set_nested

Reference:

  OpenMP specification v4.0, Section 4.6