[patch #9996] Patch libtool for macOS 11.0 (aka darwin20)

[FX]

URL:
  <https://savannah.gnu.org/patch/?9996>

                 Summary: Patch libtool for macOS 11.0 (aka darwin20)
                 Project: GNU Libtool
            Submitted by: fxcoudert
            Submitted on: Mon 16 Nov 2020 03:22:20 PM UTC
                Category: None
                Priority: 5 - Normal
                  Status: None
                 Privacy: Public
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any

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Details:

There is code in m4/libtool.m4 that assumes that macOS version numbers are of
the form 10.*, and darwin version numbers are of the form darwin1*

The latest macOS release is macOS 11.0.1 and it corresponds to the darwin20
kernel. So, this code breaks.

The patch at
https://lists.gnu.org/archive/html/libtool-patches/2020-06/msg00001.html
is confirmed to work very well, allowing to build complex software that was
failing before, such as open-mpi.

Please apply this patch to git




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