bug#27810: NS runtime feature detection

[Anders Lindgren]

Hi!

There are a lot of Mac:s still used where the last supported OS version is 10.6.8. It would be a nice touch to support them, at least as long as all we need to come up with is a good set of preprocessor tests to exclude code. Of course, should we need to put a lot of effort into maintaining support, I too would vote for dropping them (after all, there are fairly modern versions of Emacs available for them).

    -- Anders

On Tue, Jul 25, 2017 at 8:22 PM, Charles A. Roelli <charles@aurox.ch> wrote:

I'm not attached to 10.6, but if we can keep supporting it, I'd like to.


And for what it's worth, there are 11 places in nsterm.m with
version-specific code (unless I've missed some):

12 matches for "MAC_OS_X_VERSION_MAX_ALLOWED" in buffer: nsterm.m
    140:#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7
    157:#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7
   5567:  MAC_OS_X_VERSION_MAX_ALLOWED <= MAC_OS_X_VERSION_10_9
   6329:  MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_7
   7036:  MAC_OS_X_VERSION_MAX_ALLOWED <= MAC_OS_X_VERSION_10_9
   7098:  MAC_OS_X_VERSION_MAX_ALLOWED <= MAC_OS_X_VERSION_10_9
   7365:#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7
   7516:  MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_9
   7547:  MAC_OS_X_VERSION_MAX_ALLOWED <= MAC_OS_X_VERSION_10_9
   8109:#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_9
   8120:#endif /* MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_9 */
   8327:  MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_7

which seems manageable.  But if and when support for earlier macOSen
causes problems, then I'd have no objections removing support.

On 25/07/2017 19:56, Alan Third wrote:

On Mon, Jul 24, 2017 at 04:53:02PM -0400, Glenn Morris wrote:

FWIW, a comment from someone who is disinterested in OS X:

You could probably make your life easier by not supporting more
than Apple does. Eg on the net I read:

     Apple is only supporting Mac OS X 10.9 – 10.11. Apple stopped
     providing security updates for Mac OS 10.8 and earlier versions with
     the release of Mac OS X 10.11 (El Capitan) in 2015.

It would make life a lot easier, we could get rid of almost all
version dependent code. Just dropping support for 10.6 would remove a
lot too.

I doubt Charles would like that, though, and he’s the only other
person regularly working on the NS port.