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From: Simon Wright <simon@pushface.org>
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"Randy Brukardt" <randy@rrsoftware.com> writes:

> You could test the case of the file system
> (Ada.Directories.Name_Case_Equivalence), Unix/Linux is always
> Case_Insensitive. Windows is Case_Preserving unless you are running a
  ^^^^^^^^^^^^^^^^?
> POSIX file system -- but then you probably would want POSIX line
> terminators, too.

But not if you are using GNAT (GPL or FSF). Bug 80869 refers[1].

macOS will be Case_Preserving (it is possible to set HFS to be case
sensitive, but you're not advised to do so, since loads of applications
won't work).

[1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80869