linalg: remove `pure` attr from procedures using `openmp` runtime

fortran-lang / stdlib

Fortran Standard Library

https://stdlib.fortran-lang.org

MIT License

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Closed perazz closed 1 month ago

perazz commented 1 month ago

Fix #825.

Remove pure attribute from all routines that may use the openmp runtime upward.
Reference to the OpenMP standard:

OpenMP runtime library routines may not be called from PURE or ELEMENTAL procedures.

cc: @jvdp1 @fortran-lang/stdlib