Re: emacsclient 22 and 23 incompatibility

[CHENG Gao <chenggao@gmail.com>]

*On Sat, 1 Aug 2009 18:18:56 -0400
* Also sprach Ken Raeburn <raeburn@raeburn.org>:

> On Aug 1, 2009, at 15:58, CHENG Gao wrote:
>> Apple's original installation of emacs 22 has (in /usr/bin):
>>
>> ,----
>> | -r-xr-xr-x  1 root  wheel     38544  2  6  2008 emacs
>> | -rwxr-xr-x  1 root  wheel  13072480 12 17  2008 emacs-i386
>> | -rwxr-xr-x  1 root  wheel   5301856 11 25  2008 emacs-undumped
>> `----
>> Does this mean:
>> the first emacs is dumped? How could it be so small?
>
> % strings emacs
> /usr/libexec/dumpemacs
> Failed to dump emacs
> /usr/bin/emacs-i386
> execv(%s) failed
> [...]
>
> So I'm thinking Apple's "emacs" program doesn't come out of the normal
> GNU Emacs build process (or sources) at all, but does its own thing,
> which may involved dumping after installation.  If the dumped version
> is available as emacs-i386, then Apple's "emacs" will run it.  (If you
> fire up emacs and run "ps", you'll see the process listed as "emacs",
> but if you run "lsof" on it, you'll see the text image comes from
> emacs-i386.)
>
> % file emacs-undumped emacs-i386
> emacs-undumped: Mach-O universal binary with 2 architectures
> emacs-undumped (for architecture i386):	Mach-O executable i386
> emacs-undumped (for architecture ppc7400):	Mach-O executable ppc
> emacs-i386:     Mach-O executable i386
> %
>
> So "emacs-undumped" is probably a "universal" binary version of src/
> temacs, which normally would never be installed, and "emacs-i386" is
> probably the dumped version, with only the native architecture
> support.  Though, how it could still be so much larger than both the
> pre-dumped version (divided roughly in half, remember, for the i386
> portion only) and the emacs-23 binaries you built, I don't know.
>
> Ken

Thank you very much for your explanation. 



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