[Octave-bug-tracker] [bug #55538] logspace BIST tests fail when Octave built with LLVM libc++

[Markus Mützel]

Follow-up Comment #3, bug #55538 (project octave):

The attached patch duplicates the affected tests and marks them as a known
error on macOS.
Is this the coding pattern that we would like to use for tests that are known
to fail on some platforms?

Some caveats with this patch:

IIUC, it isn't clear if libstdc++ or libc++ returns the expected values here.
FWIW, the results with Matlab R2021a on Windows:

>> logspace (Inf + 1i, Inf + 1i, 3)

ans =

     -Inf +    Infi     -Inf +    Infi     -Inf +    Infi

>> logspace (-Inf + 1i, Inf + 1i, 3)

ans =

   0.0000 + 0.0000i      NaN +    NaNi     -Inf +    Infi


For all I know, their results could be different on macOS as well.

The real condition should be whether Octave was linked with libc++. Since this
is the default on macOS, and most other platforms are probably linking with
libstdc++, conditioning the tests on `ismac ()` will probably cover most cases
correctly.

(file #51349)
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Additional Item Attachment:

File name: bug55538_logspace_macOS.patch  Size:1 KB
   
<https://file.savannah.gnu.org/file/bug55538_logspace_macOS.patch?file_id=51349>



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