ChangeLog fixes

[bpt/emacs.git] / etc / PROBLEMS

diff --git a/etc/PROBLEMS b/etc/PROBLEMS
index 1869124..675644f 100644 (file)
--- a/etc/PROBLEMS
+++ b/etc/PROBLEMS
@@ -1,6 +1,6 @@
 Known Problems with GNU Emacs
 
-Copyright (C) 1987-1989, 1993-1999, 2001-2011
+Copyright (C) 1987-1989, 1993-1999, 2001-2012
   Free Software Foundation, Inc.
 See the end of the file for license conditions.
 
@@ -171,6 +171,14 @@ optimization.  To do this, configure Emacs with
 
  CFLAGS="-g -O2 -fno-optimize-sibling-calls" ./configure
 
+** Emacs compiled with GCC 4.6.1 crashes on MS-Windows when C-g is pressed
+
+This is known to happen when Emacs is compiled with MinGW GCC 4.6.1
+with the -O2 option (which is the default in the Windows build).  The
+reason is a bug in MinGW GCC 4.6.1; to work around, either add the
+`-fno-omit-frame-pointer' switch to GCC or compile without
+optimizations (`--no-opt' switch to the configure.bat script).
+
 ** Emacs crashes in x-popup-dialog.
 
 This can happen if the dialog widget cannot find the font it wants to
@@ -344,7 +352,7 @@ There are two different protocols in general use.  One of them uses
 the `flock' system call.  The other involves creating a lock file;
 `movemail' must be able to write in /usr/spool/mail in order to do
 this.  You control which one is used by defining, or not defining,
-the macro MAIL_USE_FLOCK in config.h or the m- or s- file it includes.
+the macro MAIL_USE_FLOCK in config.h or the m/ or s/ file it includes.
 IF YOU DON'T USE THE FORM OF INTERLOCKING THAT IS NORMAL ON YOUR
 SYSTEM, YOU CAN LOSE MAIL!
 
@@ -503,6 +511,12 @@ This can happen with CVS versions 1.12.8 and 1.12.9.  Upgrade to CVS
 
 ** Miscellaneous problems
 
+*** Editing files with very long lines is slow.
+
+For example, simply moving through a file that contains hundreds of
+thousands of characters per line is slow, and consumes a lot of CPU.
+This is a known limitation of Emacs with no solution at this time.
+
 *** Emacs uses 100% of CPU time
 
 This is a known problem with some versions of the Semantic package.
@@ -1236,7 +1250,7 @@ be carried out at the same time:
 4) Use lbxproxy on the remote end of the connection.  This is an interface
    to the low bandwidth X extension in most modern X servers, which
    improves performance dramatically, at the slight expense of correctness
-   of the X protocol.  lbxproxy acheives the performance gain by grouping
+   of the X protocol.  lbxproxy achieves the performance gain by grouping
    several X requests in one TCP packet and sending them off together,
    instead of requiring a round-trip for each X request in a separate
    packet.  The switches that seem to work best for emacs are:
@@ -2730,7 +2744,7 @@ value in the man page for a.out (5).
 initialized variables.  Emacs makes all initialized variables in most
 of its files pure after dumping, but the variables declared static and
 not initialized are not supposed to be pure.  On these systems you
-may need to add "#define static" to the m- or the s- file.
+may need to add "#define static" to config.h.
 
 * Runtime problems on legacy systems