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I pushed a change to the documentation of version here: http://hg.savannah.gnu.org/hgweb/octave/rev/06bb894770e8
The attached patch adds a note to the documentation for "version". (file #48026)
Maybe we could add a note to the '-blas' and '-lapack' sections of the documentation for "version" that the result might be unreliable and depend on how Octave was compiled. I agree that making the detection reliable is probably hard or impossible.
If Octave is compiled against a particular BLAS implementation, say "-lopenblas", but is run with LD_PRELOAD=/path/to/libblas.so to force a different BLAS library to be used, the `version -blas` detection still reports OpenBLAS. This may not be solvable, because both the standard BLAS API as well as OpenBLAS-specific functions are all present in the executable image in this case.
(Note: upload size limit is set to 16384 kB, after insertion of the required escape characters.)
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