Go to XCode and configure it to use Emacs.app as an external editor. Compile a file which produces errors or warnings. Double-click one of them in the build window. Emacs.app comes to the foreground and activates a buffer with that file, going to the line immediately preceding the one it should be on.
I took the liberty of fixing this on my copy, and am hoping the fix can be rolled into upstream:
diff /tmp/mac-win.old.el /tmp/mac-win.el
1742c1742
< (goto-line line)
---
> (goto-line (+ 1 line))
Diff finished. Thu Apr 10 14:48:21 2008
This should be applied against the file
/Applications/Emacs.app/Contents/Resources/lisp/term/mac-win.el
Thanks in advance.
In GNU Emacs
22.1.50.1 (i386-apple-darwin8.10.1, Carbon Version 1.6.0)
of 2007-11-06 on seijiz.local
Windowing system distributor `Apple Inc.', version 10.5.2
configured using `configure '--prefix=/Applications/Emacs.app/Contents/Resources' '--with-carbon' '--without-x' '--libexecdir=/Volumes/Emacs/Emacs.app/Contents/MacOS/libexec' 'CFLAGS=-arch i386 -arch ppc -isysroot /Developer/SDKs/MacOSX10.4u.sdk -DUSE_ATSUI -DUSE_MAC_TSM''
Important settings:
value of $LC_ALL: nil
value of $LC_COLLATE: nil
value of $LC_CTYPE: nil
value of $LC_MESSAGES: nil
value of $LC_MONETARY: nil
value of $LC_NUMERIC: nil
value of $LC_TIME: nil
value of $LANG: nil
locale-coding-system: iso-8859-1
default-enable-multibyte-characters: t
Major mode: Diff
Minor modes in effect:
encoded-kbd-mode: t
iswitchb-mode: t
desktop-save-mode: t
mac-print-mode: t
tooltip-mode: t
mouse-wheel-mode: t
file-name-shadow-mode: t
global-font-lock-mode: t
font-lock-mode: t
blink-cursor-mode: t
unify-8859-on-encoding-mode: t
utf-translate-cjk-mode: t
auto-compression-mode: t
line-number-mode: t
Recent input:
C-n C-p <tab> <return> C-x 1 C-n C-n C-n M-f M-f M-f
M-f M-b M-b C-a M-< C-s l i n e C-s C-s C-s C-s C-s
C-r C-r C-s C-s C-s C-s C-s C-s C-s C-s C-s C-s C-s
C-s C-s C-s C-s C-s C-s C-s C-s C-s C-s C-a C-p C-l
C-p C-l C-p C-l C-n C-n C-n C-e M-b ( + SPC 1 SPC C-e
) C-n C-n C-n C-n C-n C-n C-n C-n C-e C-M-b C-M-f C-x
C-e M-x c o m p i l e - f i <tab> <backspace> <backspace>
e <tab> <backspace> <tab> <tab> <M-backspace> b y t
e - c o n m p <backspace> <backspace> <backspace> m
p <tab> <tab> <tab> <return> m a c <tab> w <tab> <return>
y C-x b <return> C-M-b C-n C-n C-l C-x 1 C-p C-x C-w
/ t m p / m a c - w i n . e l <return> C-x C-f / t
m p / C-g C-x C-f / t m p / m a c - w i n <tab> <return>
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n
C-n C-n C-n M-f M-f C-k SPC l i n e ) C-_ C-_ C-k SPC
i n e ) <backspace> <backspace> <backspace> <backspace>
l i n e ) C-x C-w m a c - w i n . o l d . e l <return>
C-x b e s h <return> p u s h d SPC / t m p <return>
l s <return> d i f SPC m a c <backspace> <backspace>
<backspace> <backspace> f SPC m a c - w i n <tab> SPC
m a c <tab> <return> M-x r e p o <tab> r t - e m <tab>
<return>
Recent messages:
Saving file /tmp/mac-win.el...
Wrote /tmp/mac-win.el
Quit
Undo! [2 times]
Saving file /tmp/mac-win.old.el...
Wrote /tmp/mac-win.old.el
Loading diff...done
Loading diff-mode...done
Making completion list...
Loading emacsbug...done