bug#43369: Emacs fails to configure on ARM Macs

[Itai Seggev]

Hi.

Out of the box, that is, using master (specifically SHA 18f390af8f11d24c)
./configure fails when building on an ARM Mac.  The problem is that the
canonical triple has the form aarch64-apple-darwin20.1.0, but configure.ac is
looking for a triple of the form arm-*.

After changing arm to aarach64, I was able to build successfully both a Cocoa
and X11 versions (the latter pretty minimal, given that toolkits are still
being ported).

Here is the diff for ease of refence:

diff --git a/configure.ac b/configure.ac
index 33948fd776..40b63905ab 100644
--- a/configure.ac
+++ b/configure.ac
@@ -724,7 +724,7 @@ AC_DEFUN
   *-apple-darwin* )
     case "${canonical}" in
       *-apple-darwin[0-9].*) unported=yes ;;
-      i[3456]86-* | x86_64-* | arm-* )  ;;
+      i[3456]86-* | x86_64-* | aarch64-* )  ;;
       * )            unported=yes ;;
     esac
     opsys=darwin


--
Itai

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