8 p.m.
================================================================
Dear Bug Team!
First off, I started testing with 21.5 back in October, at the request
of some of our users who want to play with the new features
(specifically xft). I found a number of minor issues, but the
xemacs-beta list was nonexistent at the time. I'll resend the reports
now, and I apologize in advance for the mail flood. Thanks for your
time!:-)
Minor but strange... in the M-x edit-faces buffer, I can't seem to
move the cursor consistently via any means other than C-s. I'm always
stuck at the bottom of the buffer; the arrow keys and M-< do nothing.
I can use C-s to jump to a face by name, but then the left/right arrow
keys are stuck in the current field, and up/down arrows will get me
back to the the bottom of the buffer again in short order.
I know I should be using customize-face instead, but that dumps core
when xft is enabled. Another report on that to follow when I get some
more details...
================================================================
System Info to help track down your bug:
---------------------------------------
uname -a: Linux paias693 2.4.21-32.0.1.EL.msdwhugemem #1 SMP Mon Dec 5 21:32:44 EST 2005
i686 i686 i386 GNU/Linux
./configure '--prefix=/ms/dist/xemacs/PROJ/core/21.5.27/common'
'--exec-prefix=/ms/dist/xemacs/PROJ/core/21.5.27/.exec/ia32.linux.2.4.glibc.2.3'
'--with-menubars=lucid' '--with-scrollbars=lucid'
'--with-widgets=athena' '--with-dialogs=athena' '--with-cde=no'
'--with-dragndrop=no' '--with-tooltalk=no' '--with-xim=no'
'--with-ncurses' '--with-gif=yes' '--with-jpeg=yes'
'--with-png=yes' '--with-tiff=yes' '--with-database=no'
'--with-postgresql=no' '--with-ldap=yes' '--with-external-widget'
'--with-mule' '--disable-mc-alloc' '--disable-kkcc'
'--without-error-checking' '--with-xft=emacs,gauges,menubars'
'--with-gpm=yes' '--with-xpm=yes' '--with-canna'
'--with-wnn' '--with-cppflags=-idirafter/usr/include/wnn' 'CC=gcc'
'CFLAGS= ' 'CPPFLAGS= -I//ms/dist/aurora/PROJ/jpeg/6b.3/common/include
-I//ms/dist/aurora/PROJ/png/1.2.8/common/include
-I//ms/dist/fsf/PROJ/libtiff/3.7.2/common/include
-I//ms/dist/aurora/PROJ/zlib/1.2.2/common/include
-I//ms/dist/fsf/PROJ/ncurses/5.4/common/gcc32/in
clude' 'LDFLAGS= -L//ms/dist/aurora/PROJ/jpeg/6b.3/.exec/ia32.linux.2.4.lib6/lib
-Wl,-rpath,//ms/dist/aurora/PROJ/jpeg/6b.3/.exec/ia32.linux.2.4.lib6/lib
-L//ms/dist/aurora/PROJ/png/1.2.8/.exec/ia32.linux.2.4.lib6/lib
-Wl,-rpath,//ms/dist/aurora/PROJ/png/1.2.8/.exec/ia32.linux.2.4.lib6/lib
-L//ms/dist/fsf/PROJ/libtiff/3.7.2/.exec/ia32.linux.2.4.lib6/lib
-Wl,-rpath,//ms/dist/fsf/PROJ/libtiff/3.7.2/.exec/ia32.linux.2.4.lib6/lib
-L//ms/dist/aurora/PROJ/zlib/1.2.2/.exec/ia32.linux.2.4.glibc.2.3/lib
-Wl,-rpath,//ms/dist/aurora/PROJ/zlib/1.2.2/.exec/ia32.linux.2.4.glibc.2.3/lib
-L//ms/dist/fsf/PROJ/ncurses/5.4/.exec/ia32.linux.2.4.lib6/gcc32/lib
-Wl,-rpath,//ms/dist/fsf/PROJ/ncurses/5.4/.exec/ia32.linux.2.4.lib6/gcc32/lib '
XEmacs 21.5-b27 "fiddleheads" configured for `i686-pc-linux'.
Compilation Environment and Installation Defaults:
Source code location:
/var/tmp/build.ronisaac/xemacs/core/21.5.27/ia32.linux.2.4.glibc.2.3/gcc32
Installation prefix: /ms/dist/xemacs/PROJ/core/21.5.27/common
Operating system description file: `s/linux.h'
Machine description file: `m/intel386.h'
Compiler version: gcc (GCC) 3.2.3 20030502 (Red Hat Linux 3.2.3-42)
- GCC specs file:
/ms/dist/fsf/PROJ/gcc/3.2/lib/gcc-lib/i686-redhat-linux/3.2.3/specs
- Compiler command: gcc -Wall -Wno-switch -Wundef -Wsign-compare
-Wno-char-subscripts -Wpacked -Wunused-parameter -g
libc version: 2.3.2
Relocating allocator for buffers: no
GNU version of malloc: yes
- Using Doug Lea's new malloc from the GNU C Library.
Window System:
Compiling in support for the X window system:
- X Windows headers location: /usr/X11R6/include
- X Windows libraries location: /usr/X11R6/lib
- Handling WM_COMMAND properly.
- Using fontconfig to manage fonts.
- Compiling in support for Xft antialiased fonts (EXPERIMENTAL).
Compiling in support for the Athena widget set:
- Athena headers location: X11/Xaw
- Athena library to link: Xaw
Using Lucid menubars.
- Using Xft to render antialiased fonts in menubars.
WARNING: This feature will be replaced with a face.
Using Lucid scrollbars.
Using Athena dialog boxes.
Using Athena native widgets.
- Using Xft to render antialiased fonts in progress bars.
WARNING: This feature will be replaced with a face.
WARNING: This feature not yet implemented; setting ignored.
TTY:
Compiling in support for ncurses.
Compiling in support for GPM (General Purpose Mouse).
Images:
Compiling in support for GIF images (builtin).
Compiling in support for XPM images.
Compiling in support for PNG images.
Compiling in support for JPEG images.
Compiling in support for TIFF images.
Sound:
Compiling in support for sound (native).
Databases:
Compiling in support for LDAP.
Internationalization:
Compiling in support for Mule (multi-lingual Emacs).
Compiling in support for Canna on Mule.
Compiling in support for the WNN input method on Mule.
Mail:
Compiling in support for "file" mail spool file locking method.
Other Features:
Inhibiting IPv6 canonicalization at startup.
Compiling in support for dynamic shared object modules.
Using the new portable dumper.
Dumping into executable.
Compiling in support for extra debugging code.
Load-Path Lisp Shadows:
----------------------
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/ms/dev/xemacs/core/21.5.27/install/exec/lib/xemacs/xemacs-packages/lisp/ecrypto/hex-util
//ms/dist/xemacs/PROJ/flim/1.14.7/lisp/flim/md5
/ms/dev/xemacs/core/21.5.27/install/exec/lib/xemacs/xemacs-packages/lisp/ecrypto/md5
//ms/dist/xemacs/PROJ/flim/1.14.7/lisp/flim/md4
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/ms/dev/xemacs/core/21.5.27/install/exec/lib/xemacs/site-packages/lisp/csharp/setnu
/ms/dev/xemacs/core/21.5.27/install/exec/lib/xemacs/xemacs-packages/lisp/edit-utils/setnu
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/ms/dev/xemacs/core/21.5.27/install/exec/lib/xemacs/xemacs-packages/lisp/gnus/smime
/ms/dev/xemacs/core/21.5.27/install/exec/lib/xemacs/site-packages/lisp/csharp/beanshell
/ms/dev/xemacs/core/21.5.27/install/exec/lib/xemacs/xemacs-packages/lisp/jde/beanshell
//ms/user/r/ronisaac/lib/emacs/mc-toplev
/ms/dev/xemacs/core/21.5.27/install/exec/lib/xemacs/xemacs-packages/lisp/mailcrypt/mc-toplev
//ms/user/r/ronisaac/lib/emacs/mc-remail
/ms/dev/xemacs/core/21.5.27/install/exec/lib/xemacs/xemacs-packages/lisp/mailcrypt/mc-remail
//ms/user/r/ronisaac/lib/emacs/mc-pgp
/ms/dev/xemacs/core/21.5.27/install/exec/lib/xemacs/xemacs-packages/lisp/mailcrypt/mc-pgp
//ms/user/r/ronisaac/lib/emacs/mailcrypt
/ms/dev/xemacs/core/21.5.27/install/exec/lib/xemacs/xemacs-packages/lisp/mailcrypt/mailcrypt
//ms/dist/xemacs/PROJ/semi/1.14.6/lisp/semi/pgg-pgp5
/ms/dev/xemacs/core/21.5.27/install/exec/lib/xemacs/xemacs-packages/lisp/pgg/pgg-pgp5
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Installed XEmacs Packages:
-------------------------
(zenirc ver: 1.16 upstream: 2.112)
(xwem ver: 1.22 upstream: lg(a)xwem.org--2005/xwem--main--2.1--versionfix-1)
(xslt-process ver: 1.12 upstream: 1.2.1)
(xslide ver: 1.09 upstream: 0.2.2)
(xlib ver: 1.14 upstream: lg(a)xwem.org--2005/xlib--main--2.1--version-0)
(xetla ver: 1.01 upstream: steve(a)eicq.org--2005/xetla--main--1.1--version-0)
(xemacs-devel ver: 1.72 upstream: No-Upstream-Ver)
(xemacs-base ver: 2.03 upstream: No-Upstream-Ver)
(x-symbol ver: 1.1 upstream: 4.5.1)
(w3 ver: 1.32 upstream: 4.0pre47)
(vm ver: 7.22 upstream: 7.17)
(viper ver: 1.48 upstream: 3.09)
(view-process ver: 1.13 upstream: 2.4)
(vhdl ver: 1.21 upstream: 3.33.8)
(vc-cc ver: 1.22 upstream: No-Upstream-Ver)
(vc ver: 1.41 upstream: No-Upstream-Ver)
(tramp ver: 1.32 upstream: 2.0.53)
(tpu ver: 1.14 upstream: 4.2X)
(tooltalk ver: 1.15 upstream: No-Upstream-Ver)
(tm ver: 1.38 upstream: No-Upstream-Ver)
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(textools ver: 1.15 upstream: No-Upstream-Ver)
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3:34 p.m.
Ron Isaacson writes:
Minor but strange... in the M-x edit-faces buffer, I can't seem
to
move the cursor consistently via any means other than C-s.
Reproduced. Word motion at least works. Once you're away from an
extent boundary (I think that's probably the relevant condition),
arrow keys work too. Once you're in a field, editing works.
I suspect this is due to the attempt to port GNU Emacs's "fields" to
XEmacs, which is causing lots of other anomolies and is planned to be
reverted soon. I probably won't work on this until fields have been
reverted.
Have you tried this with a non-Xft build yet?
I know I should be using customize-face instead,
I wouldn't bet on that working at all with Xft. Good luck....
but that dumps core when xft is enabled.
Can't reproduce that. Please make sure to include a C back trace, and
please turn error-checking on.
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10:36 p.m.
Stephen J. Turnbull wrote:
Ron Isaacson writes:
> Minor but strange... in the M-x edit-faces buffer, I can't seem to
> move the cursor consistently via any means other than C-s.
Reproduced. Word motion at least works. Once you're away from an
extent boundary (I think that's probably the relevant condition),
arrow keys work too. Once you're in a field, editing works.
I suspect this is due to the attempt to port GNU Emacs's "fields" to
XEmacs, which is causing lots of other anomolies and is planned to be
reverted soon. I probably won't work on this until fields have been
reverted.
Have you tried this with a non-Xft build yet?
Yup. Same problem.
> I know I should be using customize-face instead,
I wouldn't bet on that working at all with Xft. Good luck....
> but that dumps core when xft is enabled.
Can't reproduce that. Please make sure to include a C back trace, and
please turn error-checking on.
Actually, it dumps core whether or not xft is enabled. I built with
all error checking and assertions, but didn't see anything. I'm having
trouble getting a backtrace out of the core file; once I get help from
one of my gdb-guru colleagues, I'll send a detailed report. Thanks!
--
Ron Isaacson
Morgan Stanley
ron.isaacson(a)morganstanley.com / (212) 276-0268
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11:24 p.m.
Ron Isaacson wrote:
> > I know I should be using customize-face instead,
> > but that dumps core when xft is enabled.
>
> Can't reproduce that. Please make sure to include a C back trace, and
> please turn error-checking on.
Actually, it dumps core whether or not xft is enabled. I built with
all error checking and assertions, but didn't see anything. I'm having
trouble getting a backtrace out of the core file; once I get help from
one of my gdb-guru colleagues, I'll send a detailed report. Thanks!
Ok, got some more details on this. The coredump was completely
unusable, but gdb helped narrow it down to two problems which
converged with unfortunate results:
1. We build most software with minimal dependencies on /usr/lib, so
it works across OS releases. For example, libpng comes from a
central location, and we have a build wrapper that sets CPPFLAGS
to include -I/our/path/to/libpng, and also -L and -Wl,-rpath.
In our args to xemacs's configure, we also use:
--with-cppflags=-idirafter/usr/include/wnn
along with lots of other craziness to get wnn to work correctly.
Unfortunately, --with-cppflags REPLACES the contents of the
inherited CPPFLAGS, instead of appending to it. So we end up
without our central include paths in CPPFLAGS at compile-time,
and we pick up lots of header files from /usr, while getting the
matching libs from our central location at build-time & runtime.
2. Because of the above, at runtime, png_create_read_struct
(glyphs-eimage.c:875) throws an error ("Incompatible libpng
version in application and library"). This gets passed to the
error handler, png_ptr->error_fn, which points to png_error_func
(glyphs-eimage.c:821). This function, in turn, does a longjmp to
png_err_stct.setjmp_buffer.
The problem is that the setjmp_buffer in the png_err_stct lexical
struct isn't set until line 902. This is inside png_instantiate,
but not until AFTER the call to png_create_read_struct, which is
the function that throws the error! So at the time png_error_func
gets called, setjmp_buffer contains 0. This explains why the
corefile has no usable stack trace.
You might argue that #1 is our problem, and that if you specify
--with-cppflags, that's an override to the default behavior of
inheriting CPPFLAGS. We've got an easy workaround for that, but it
still might be something to consider.
#2 is definitely not our problem. :-) I think you need to ensure that
png_err_stct.setjmp_buffer is set to a valid address BEFORE passing
png_error_func as a parameter to anything. Otherwise, any runtime
error from png_create_read_struct will get you into the same boat.
--
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2:30 a.m.
Ron Isaacson writes:
You might argue that #1 is our problem, and that if you specify
--with-cppflags, that's an override to the default behavior of
inheriting CPPFLAGS. We've got an easy workaround for that, but it
still might be something to consider.
It's not properly documented, so that's our problem.
Does `configure --with-cppflags="-newflag $CPPFLAGS" ...' work in your
application? I think that having the `--with-WHATEVERflags' options
override the corresponding environment variables is easier to
explain. It's certainly easier to code!
This option overrides the environment. If you wish to include the
flags that may have been specified in CPPFLAGS, this must be done
explicitly: `--with-cppflags="-addlflag $CPPFLAGS"'.
#2 is definitely not our problem. :-) I think you need to ensure
that
png_err_stct.setjmp_buffer is set to a valid address BEFORE passing
png_error_func as a parameter to anything. Otherwise, any runtime
error from png_create_read_struct will get you into the same boat.
Thanks for diagnosing this! I'll have to tweak Jerry about this, this
kind of thing should be catchable via one of those famous static
checkers.:-)
Steve
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2:44 a.m.
Stephen J. Turnbull wrote:
Ron Isaacson writes:
> You might argue that #1 is our problem, and that if you specify
> --with-cppflags, that's an override to the default behavior of
> inheriting CPPFLAGS. We've got an easy workaround for that, but it
> still might be something to consider.
It's not properly documented, so that's our problem.
Does `configure --with-cppflags="-newflag $CPPFLAGS" ...' work in your
application?
Yup, that was exactly the workaround we found. Real tricky. :-)
I think that having the `--with-WHATEVERflags' options
override the corresponding environment variables is easier to
explain. It's certainly easier to code!
This option overrides the environment. If you wish to include the
flags that may have been specified in CPPFLAGS, this must be done
explicitly: `--with-cppflags="-addlflag $CPPFLAGS"'.
I think that would do the trick.
Incidentally, once we got this sorted out, customize-face did indeed
work, both with xft and without! Go figure!
--
Ron Isaacson
Morgan Stanley
ron.isaacson(a)morganstanley.com / (212) 276-0268
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2:02 p.m.
New subject: [21.5] Fix crash in PNG initialiation [was: can't move cursor ...]
21.5
Vin, this presumably affects 21.4 too. If you don't recall any
related reports (probably only comes up if PNG lib that gets found at
runtime differs from build-time link lib), I'll take my time....
Stephen J. Turnbull writes:
Does `configure --with-cppflags="-newflag $CPPFLAGS"
...' work in your
application? I think that having the `--with-whateverflags' options
override the corresponding environment variables is easier to
explain. It's certainly easier to code!
[[ This is in my queue but I am working on other stuff. ]]
Ron Isaacson writes:
> #2 is definitely not our problem. :-) I think you need to
ensure that
> png_err_stct.setjmp_buffer is set to a valid address BEFORE passing
> png_error_func as a parameter to anything. Otherwise, any runtime
> error from png_create_read_struct will get you into the same boat.
OK, yes, this is really ugly. (But then, when isn't a setjmp/longjmp
ugly?) I think the attached patch should fix the problem, but I don't
yet have a test case and I've never patched code involving setjmp/
longjmp before so a second opinion would be welcome (and a third...).
(I think the relevant test case for the original bug can be easily
constructed by substituting "You're going down, sucker!" for
PNG_LIBPNG_VER_STRING, but I haven't done that yet.)
The first hunk is a little suspicious; for some reason
png_destroy_read_struct() wants access to the pointer variable
containing png_ptr, not just the pointer itself. The only reason I
can think why it would want that is to NULL it, and I've done that, so
passing &tmp to png_destroy_read_struct() should be OK, I think.
The other changes are to first NULL out any unwind pointers to
structures that are being destroyed in case the libpng code longjmps,
then call libpng's finalizer; to move the setjmp call much earlier;
and to stuff the unwind structure with the the necessary data as soon
as we get it.
I guess I have to assume that none of the libpng functions will
implicitly call a finalizer....
I'll run with it a while before committing, but would really
appreciate comments.
2007-02-17 Stephen J. Turnbull <stephen(a)xemacs.org>
* glyphs-eimage.c (png_instantiate_unwind): Avoid recursion.
(png_instantiate): Initialize setjmp_buffer early, and avoid
recursive entry to error handler.
diff --git a/src/glyphs-eimage.c b/src/glyphs-eimage.c
index 49364ca..5184e2c 100644
--- a/src/glyphs-eimage.c
+++ b/src/glyphs-eimage.c
＠＠ -849,7 +849,13 ＠＠ png_instantiate_unwind (Lisp_Object unwind_obj)
free_opaque_ptr (unwind_obj);
if (data->png_ptr)
- png_destroy_read_struct (&(data->png_ptr), &(data->info_ptr),
(png_infopp)NULL);
+ {
+ /* ensure we can't get here again */
+ png_structp tmp = data->png_ptr;
+ data->png_ptr = NULL;
+ png_destroy_read_struct (&tmp, &(data->info_ptr), (png_infopp)NULL);
+ }
+
if (data->instream)
retry_fclose (data->instream);
＠＠ -874,24 +880,36 ＠＠ png_instantiate (Lisp_Object image_instance, Lisp_Object
instantiator,
png_structp png_ptr;
png_infop info_ptr;
+ xzero (unwind);
+ record_unwind_protect (png_instantiate_unwind, make_opaque_ptr (&unwind));
+
+ if (setjmp (png_err_stct.setjmp_buffer))
+ {
+ /* Something blew up:
+ just display the error (cleanup happens in the unwind) */
+ signal_image_error_2 ("Error decoding PNG",
+ build_string(png_err_stct.err_str),
+ instantiator);
+ }
+
/* Initialize all PNG structures */
- png_ptr = png_create_read_struct (PNG_LIBPNG_VER_STRING, (void*)&png_err_stct,
+ png_ptr = png_create_read_struct (PNG_LIBPNG_VER_STRING,
+ (void *) &png_err_stct,
png_error_func, png_warning_func);
if (!png_ptr)
signal_image_error ("Error obtaining memory for png_read", instantiator);
+ unwind.png_ptr = png_ptr;
+
info_ptr = png_create_info_struct (png_ptr);
if (!info_ptr)
{
+ unwind.png_ptr = NULL; /* avoid re-calling png_destroy_read_struct
+ when unwinding */
png_destroy_read_struct (&png_ptr, (png_infopp)NULL, (png_infopp)NULL);
signal_image_error ("Error obtaining memory for png_read",
instantiator);
}
-
- xzero (unwind);
- unwind.png_ptr = png_ptr;
unwind.info_ptr = info_ptr;
- record_unwind_protect (png_instantiate_unwind, make_opaque_ptr (&unwind));
-
/* This code is a mixture of stuff from Ben's GIF/JPEG stuff from
this file, example.c from the libpng 0.81 distribution, and the
pngtopnm sources. -WMP-
＠＠ -900,16 +918,6 ＠＠ png_instantiate (Lisp_Object image_instance, Lisp_Object
instantiator,
and is no longer usable for previous versions. jh
*/
- /* Set the jmp_buf return context for png_error ... if this returns !0, then
- we ran into a problem somewhere, and need to clean up after ourselves. */
- if (setjmp (png_err_stct.setjmp_buffer))
- {
- /* Something blew up: just display the error (cleanup happens in the unwind) */
- signal_image_error_2 ("Error decoding PNG",
- build_string(png_err_stct.err_str),
- instantiator);
- }
-
/* Initialize the IO layer and read in header information */
{
Lisp_Object data = find_keyword_in_vector (instantiator, Q_data);
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10:56 a.m.
New subject: [21.5] Fix crash in PNG initialiation [was: can't move cursor ...]
21.5 APPROVE COMMIT
Stephen J. Turnbull writes:
OK, yes, this is really ugly. (But then, when isn't a
setjmp/longjmp
ugly?) I think the attached patch should fix the problem, but I don't
yet have a test case and I've never patched code involving setjmp/
longjmp before so a second opinion would be welcome (and a third...).
(I think the relevant test case for the original bug can be easily
constructed by substituting "You're going down, sucker!" for
PNG_LIBPNG_VER_STRING, but I haven't done that yet.)
I still need to do this, but
I'll run with it a while before committing, but would really
appreciate comments.
I've run, I've pulled in a bunch of PNGs including some that our PNG
library doesn't like, with no trouble yet.
2007-02-17 Stephen J. Turnbull <stephen(a)xemacs.org>
* glyphs-eimage.c (png_instantiate_unwind): Avoid recursion.
(png_instantiate): Initialize setjmp_buffer early, and avoid
recursive entry to error handler.
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9:49 p.m.
New subject: [AC21.4] Fix crash in PNG initialiation [was: can't move cursor ...]
APPROVE COMMIT 21.4
Thanks for the patch, Stephen.
It has been committed to the 21.4 branch and will appear in 21.4.21.
- Vin
On 2/21/07, Stephen J. Turnbull <stephen(a)xemacs.org> wrote:
21.5 APPROVE COMMIT
Stephen J. Turnbull writes:
> OK, yes, this is really ugly. (But then, when isn't a setjmp/longjmp
> ugly?) I think the attached patch should fix the problem, but I don't
> yet have a test case and I've never patched code involving setjmp/
> longjmp before so a second opinion would be welcome (and a third...).
> (I think the relevant test case for the original bug can be easily
> constructed by substituting "You're going down, sucker!" for
> PNG_LIBPNG_VER_STRING, but I haven't done that yet.)
I still need to do this, but
> I'll run with it a while before committing, but would really
> appreciate comments.
I've run, I've pulled in a bunch of PNGs including some that our PNG
library doesn't like, with no trouble yet.
> 2007-02-17 Stephen J. Turnbull <stephen(a)xemacs.org>
>
> * glyphs-eimage.c (png_instantiate_unwind): Avoid recursion.
> (png_instantiate): Initialize setjmp_buffer early, and avoid
> recursive entry to error handler.
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8 comments
3 participants
participants (3)
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Ron Isaacson -
Stephen J. Turnbull -
Vin Shelton